Physical Quantities
A simulation output stores many different types of physical information about its matter components, e.g. gas, stars, dark matter, and supermassive black holes. The original snapshots contain basic information, such as positions and masses, and we refer to these as default snapshot quantities. After a galaxy/halo finder has been run, the resulting group catalogs aggregate these same fields, computing e.g. the total stellar mass of a galaxy by summing up the masses of its associated stars. We refer to these fields as default catalog quantities.
From these physical quantities, many others can be derived. These are value-added properties which are not output directly by the simulation, but must be calculated. For example, simple unit conversions (e.g. from code mass, to solar masses), fundamental derived quantities (e.g. pressure, given density and internal energy), non-trivial theoretical quantities (e.g. enclosed mass, gravitational free-fall time, or the ratio of gas cooling time to free-fall time), and post-processed quantities and observables (e.g. gas x-ray emission, stellar light and spectra, or ion abundances from photoionization modeling). These we refer to as custom snapshot quantities, and when the derived properties are for galaxies or halos instead of individual particles/cells, custom catalog quantities.
Default Snapshot Quantities
These are the fields which are directly available from the on-disk snapshot files themselves.
For example, PartType0/StarFormationRate (for gas) or PartType4/Masses (for stars).
For complete documentation of available fields, their definitions, and units, see
the IllustrisTNG Public Data Release Snapshot Documentation.
The temet.load.snap_fields module defines metadata associated with these fields,
including a description (label for plotting), units, and default bounds.
Default Catalog Quantities
These are the fields which are directly available from the on-disk group catalog files themselves.
Specifically, by the combination of the friends-of-friends (FoF) algorithm plus the Subfind algorithm,
which identifies gravitationally bound structures: halos and subhalos.
For example, SubhaloMass or Group_M_Crit200 are two common fields.
For complete documentation of available fields, their definitions, and units, see
the IllustrisTNG Public Data Release Group Catalog Documentation.
Adding New Custom Snapshot Quantities
Each custom field is generated by a function, and the name of the function is the name of the
custom field. All such defined fields are recorded in a ‘registry’. To create a new custom
field is simple: just define a function, and decorate it with the @snap_field decorator, as
shown below. It must accept four ordered arguments: (sim, partType, field, args), and must
return a numpy array of the requested values.
You can find all built-in custom quantities defined in the temet.load.snap_fields_custom
module. If you are editing this package directly, or want to share your custom fields in the
future, you can add to that file. But, you can also define your custom field in any file you want.
For example, to define a new custom field for the ‘spherical equivalent radius’ of a gas cell:
from temet.load.snapshot import snap_field
@snap_field
def cell_radius(sim, partType, field, args):
# load and manipulate data, return
vol = sim.snapshotSubset(partType, 'vol', **args)
return (vol * 3.0 / (4*np.pi))**(1.0/3.0)
Important metadata should also be specified, just below (and outside) the function itself:
cell_radius.units = 'code_length'
cell_radius.label = 'Cell Radius'
cell_radius.limits = [-2.0, 2.0]
cell_radius.log = True
Note: units and label should correspond to the returned values. limits is a default
suggestion for a [min,max] range for plotting, while log indicates if the value should
in general be logged for plotting/display (usually True, and by default True if omitted, as our
convention is to always return linear values).
You can also register the same derived field under one or more additional names (‘aliases’):
@snap_field(aliases=['cellrad','rcell'])
def cell_radius(sim, partType, field, args):
# load and manipulate data, return
# ...
Finally, you can define ‘wildcard’ fields which capture, and then handle, many different field names
at once. For example, imagine you could compute the optical stellar spectrum for any star particle,
and you wanted to define a new field of the form specmean_{wavemin}_{wavemax} which would return
the mean flux between the two specified wavelengths, which are arbitrary inputs. If we had such a custom
field, we could compute e.g. D4000 = specmean_4050_4250 / specmean_3750_3950} (indeed,
we could then define yet another custom field called D4000 which did exactly this, automatically).
To handle these two field names, or any others of the same form, we could define:
@snap_field(multi=True)
def specmean_(sim, partType, field, args):
# get wavelengths out of field string
_, wavemin, wavemax = field.split('_')
# compute spectrum, measure mean in this wavelength window, and return
# ...
In this case, any snapshot load request (e.g. sim.stars('specmean_5000,6000', haloID=10)) which
contains the string specmean_ will get routed to this generator function.
Note: in the case that multi is not a simple bool, but instead a string, then the value
itself is used as the matching pattern (see cloudy_ for an example, which matches on spaces).
Adding New Custom Catalog Quantities
Custom fields for group catalog objects i.e. halos/subhalos are defined similarly to snapshot fields:
from temet.load.groupcat import catalog_field
@catalog_field
def my_ssfr(sim, field):
""" Galaxy specific star formation rate, instantaneous (total subhalo SFR normalized by fiducial stellar mass)."""
sfr = sim.subhalos("SubhaloSFR") # Msun/yr
mstar = sim.subhalos("SubhaloMassInRadType")[:, sim.ptNum("stars")] # code mass
mstar_msun = sim.units.codeMassToMsun(mstar)
ssfr = sfr / mstar_msun
return ssfr
my_ssfr.label = r"My sSFR"
my_ssfr.units = r"$\rm{yr^{-1}}$"
my_ssfr.limits = [-13.3, -8.0]
my_ssfr.log = True
The same alias and wildcard matching functionality is also available for catalog fields, via the
@catalog_field decorator arguments.
Custom Catalog Quantities
The following halo/subhalo custom quantities are currently defined, in the
temet.load.groupcat_fields_custom module, along with associated metadata including
a description, units, reasonable bounds, and so on.
Field Name |
Label |
Units |
Aliases |
Description |
|---|---|---|---|---|
d5_mstar_gthalf |
\(d_{5}\) |
code_length |
d5_mstar_gt7, d5_mstar_gt8 |
Environment: distance to 5th nearest neighbor (subhalo) that has a stellar mass at least half of our own (default unless specified). |
delta5_mstar_gthalf |
\(\delta_{5}\) |
– |
delta5_mstar_gt7, delta5_mstar_gt8 |
Environment: overdensity based on 5th nearest neighbor (subhalo). |
num_ngb_gthalf |
\(\rm{N_{ngb,subhalos}}\) |
– |
num_ngb_gt7, num_ngb_gt8, num_ngb_gttenth |
Environment: counts of nearby neighbor subhalos, within a given 3D specture, satisfying some minimum (relative) stellar mass criterion. |
mass_ovi |
\(\rm{M_{OVI}}\) |
\(\rm{M_{sun}}\) |
Total gas mass in sub-species: OVI. |
|
mass_ovii |
\(\rm{M_{OVII}}\) |
\(\rm{M_{sun}}\) |
Total gas mass in sub-species: OVII. |
|
mass_oviii |
\(\rm{M_{OVIII}}\) |
\(\rm{M_{sun}}\) |
Total gas mass in sub-species: OVIII. |
|
mass_o |
\(\rm{M_{O,gas}}\) |
\(\rm{M_{sun}}\) |
Total gas mass in sub-species: O. |
|
mass_z |
\(\rm{M_{Z,gas}}\) |
\(\rm{M_{sun}}\) |
Total gas mass in sub-species: Z. |
|
mass_halogas |
\(\rm{M_{halo,gas}}\) |
\(\rm{M_{sun}}\) |
Total halo (0.15 < r/rvir < 1.0) gas mass. |
|
mass_halogasfof |
\(\rm{M_{halo,gas}}\) |
\(\rm{M_{sun}}\) |
Total halo (0.15 < r/rvir < 1.0) gas mass. FoF-scope, centrals only. |
|
mass_halogas_cold |
\(\rm{M_{halo,gas,cold}}\) |
\(\rm{M_{sun}}\) |
Total halo (0.15 < r/rvir < 1.0) gas mass. Only cold (log T < 4.5 K), star-forming gas at eEOS temp. |
|
mass_halogas_sfcold |
\(\rm{M_{halo,gas,sfcold}}\) |
\(\rm{M_{sun}}\) |
Total halo (0.15 < r/rvir < 1.0) gas mass. Only cold (log T < 4.5 K), star-forming gas at cold temp. |
|
mass_halogasfof_cold |
\(\rm{M_{halo,gas,cold}}\) |
\(\rm{M_{sun}}\) |
Total halo (0.15 < r/rvir < 1.0) gas mass. FoF-scope, centrals only. Only cold (log T < 4.5 K), star-forming gas at eEOS temp. |
|
mass_halogasfof_sfcold |
\(\rm{M_{halo,gas,sfcold}}\) |
\(\rm{M_{sun}}\) |
Total halo (0.15 < r/rvir < 1.0) gas mass. FoF-scope, centrals only. Only cold (log T < 4.5 K), star-forming gas at cold temp. |
|
frac_halogas_cold |
\(\rm{M_{halo,gas,cold} / M_{halo,gas}}\) |
– |
Fraction of halo (0.15 < r/rvir < 1.0) gas mass that is cold (log T < 4.5 K), star-forming gas at eEOS temp. |
|
frac_halogas_sfcold |
\(\rm{M_{halo,gas,sfcold} / M_{halo,gas}}\) |
– |
Fraction of halo (0.15 < r/rvir < 1.0) gas mass that is cold (log T < 4.5 K), star-forming gas at cold temp. |
|
frac_halogasfof_cold |
\(\rm{M_{halo,gas,cold} / M_{halo,gas}}\) |
– |
Fraction of halo (0.15 < r/rvir < 1.0) gas mass that is cold (log T < 4.5 K), star-forming gas at eEOS temp. FoF-scope, centrals only. |
|
frac_halogasfof_sfcold |
\(\rm{M_{halo,gas,sfcold} / M_{halo,gas}}\) |
– |
Fraction of halo (0.15 < r/rvir < 1.0) gas mass that is cold (log T < 4.5 K), star-forming gas at cold temp. FoF-scope, centrals only. |
|
mass_smbh |
\(\rm{M_{SMBH}}\) |
\(\rm{M_{sun}}\) |
Largest SMBH mass in each subhalo. Avoids summing multiple SMBH masses, if more than one present. |
|
smbh_mdot |
\(\rm{\dot{M}_{SMBH}}\) |
\(\rm{M_{sun} / yr}\) |
Largest SMBH Mdot in each subhalo. |
|
smbh_lum |
\(\rm{L_{AGN,bol}}\) |
\(\rm{erg / s}\) |
l_bol, l_agn |
Bolometric luminosity of largest SMBH in each subhalo. |
fgas_r200 |
\(\rm{f_{gas}(<r_{200c})}\) |
– |
Gas mass fraction (= Mgas/Mtot) within the virial radius, r200c. FoF-scope approximation. |
|
fgas_r500 |
\(\rm{f_{gas}(<r_{500c})}\) |
– |
Gas mass fraction (= Mgas/Mtot) within r500c. FoF-scope approximation. |
|
sfr |
\(\rm{SFR_{<30kpc},instant}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
sfr_30pkpc, sfr_30pkpc_instant |
Galaxy star formation rate (instantaneous, within 30pkpc aperture). |
sfr_10myr |
\(\rm{SFR_{10Myr}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Star formation rate (full subhalo) averaged over the past 10 Myr. |
|
sfr_30pkpc_10myr |
\(\rm{SFR_{<30kpc,10Myr}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Star formation rate (30pkpc) averaged over the past 10 Myr. |
|
sfr_50myr |
\(\rm{SFR_{50Myr}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Star formation rate (full subhalo) averaged over the past 50 Myr. |
|
sfr_30pkpc_50myr |
\(\rm{SFR_{<30kpc,50Myr}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Star formation rate (30pkpc) averaged over the past 50 Myr. |
|
sfr_100myr |
\(\rm{SFR_{100Myr}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Star formation rate (full subhalo) averaged over the past 100 Myr. |
|
sfr_30pkpc_100myr |
\(\rm{SFR_{<30kpc,100Myr}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Star formation rate (30pkpc) averaged over the past 100 Myr. |
|
sfr_10_100_ratio |
\(\rm{SFR_{10Myr}}\) / \(\rm{SFR_{100Myr}}\) |
– |
sfr_10_100 |
Ratio of SFR_10Myr / SFR_100Myr (full subhalo) as a burstyness indicator. |
ssfr_30pkpc |
\(\rm{sSFR}\) |
\(\rm{yr^{-1}}\) |
ssfr_30pkpc_instant |
Galaxy specific star formation rate [1/yr] (sSFR, instantaneous, SFR and M* within 30kpc). |
ssfr_30pkpc_10myr |
\(\rm{sSFR, 10Myr}\) |
\(\rm{yr^{-1}}\) |
Galaxy specific star formation rate [1/yr] (sSFR, 10 Myr, SFR and M* within 30kpc). |
|
ssfr_30pkpc_50myr |
\(\rm{sSFR, 50Myr}\) |
\(\rm{yr^{-1}}\) |
Galaxy specific star formation rate [1/yr] (sSFR, 50 Myr, SFR and M* within 30kpc). |
|
ssfr_30pkpc_100myr |
\(\rm{sSFR, 100Myr}\) |
\(\rm{yr^{-1}}\) |
Galaxy specific star formation rate [1/yr] (sSFR, 100 Myr, SFR and M* within 30kpc). |
|
sfr_surfdens |
\(\rm{\Sigma_{SFR}}\) |
\(\rm{M_\odot \, yr^{-1} \, kpc^{-2}}\) |
sfr_surfdens_30pkpc_instant |
Star formation surface density (instantaneous, SFR and M* within 30kpc). |
sfr_surfdens_30pkpc_10myr |
\(\rm{\Sigma_{SFR}}\) |
\(\rm{M_\odot \, yr^{-1} \, kpc^{-2}}\) |
Star formation surface density (10 Myr, SFR and M* within 30kpc). |
|
sfr_surfdens_30pkpc_50myr |
\(\rm{\Sigma_{SFR}}\) |
\(\rm{M_\odot \, yr^{-1} \, kpc^{-2}}\) |
Star formation surface density (50 Myr, SFR and M* within 30kpc). |
|
sfr_surfdens_30pkpc_100myr |
\(\rm{\Sigma_{SFR}}\) |
\(\rm{M_\odot \, yr^{-1} \, kpc^{-2}}\) |
Star formation surface density (100 Myr, SFR and M* within 30kpc). |
|
szy_r500c_3d |
\(\rm{Y_{SZ,r500}^{3d}}\) |
\(\rm{Mpc^2}\) |
Sunyaev Zeldovich y-parameter within r500c (3d). |
|
szy_r500c_2d |
\(\rm{Y_{SZ,r500}^{2d}}\) |
\(\rm{Mpc^2}\) |
Sunyaev Zeldovich y-parameter within r500c (2d). |
|
xray_r500 |
L \(_{\rm X}\) Bolometric ( \(R_{500c}\) ) |
\(\rm{erg/s}\) |
Bolometric X-ray luminosity (simple free-free model), within r500c. |
|
xray_subhalo |
L \(_{\rm X}\) Bolometric |
\(\rm{erg/s}\) |
Bolometric X-ray luminosity (simple free-free model), within full subhalo. |
|
xray_05_2kev_r500 |
L \(_{\rm X,r500}^{\rm 0.5-2 keV}\) |
\(\rm{erg/s}\) |
X-ray luminosity 0.5-2.0 keV (APEC model), within r500c in 3D. |
|
xray_05_2kev_r500_halo |
L \(_{\rm X,r500}^{\rm 0.5-2 keV}\) |
\(\rm{erg/s}\) |
X-ray luminosity 0.5-2.0 keV (APEC model), within r500c in 3D (FoF-scope). |
|
xray_01_24kev_r500_halo |
L \(_{\rm X,r500}^{\rm 0.1-2.4 keV}\) |
\(\rm{erg/s}\) |
X-ray luminosity 0.1-2.4 keV (APEC model), within r500c in 3D (FoF-scope). |
|
xraylum_r500c_2d |
\(\rm{L_{X,r500}^{2d}}\) |
\(\rm{erg/s}\) |
X-ray luminosity (0.5-2.0 keV) within r500c (2d). |
|
xray_peak_offset_2d |
\(\rm{\Delta_{X-ray,galaxy}^{2d}}\) |
\(\rm{kpc}\) |
xray_peak_offset_2d_rvir, xray_peak_offset_2d_r500 |
Spatial offset between X-ray (0.5-2.0 keV) emission peak and galaxy (SubhaloPos). In 2D projection. |
tcool_halo_ovi |
\(\rm{t_{cool,halo,OVI}}\) |
\(\rm{Gyr}\) |
Mean cooling time of halo gas, weighted by OVI mass. |
|
p_sync_ska |
\(\rm{P_{sync,VLA}}\) |
\(\rm{W / Hz}\) |
p_sync_ska_eta43, p_sync_ska_alpha15 |
Synchrotron power radio emission (SKA model). |
p_sync_vla |
– |
p_sync_vla_eta43, p_sync_vla_alpha15 |
Synchrotron power radio emission (VLA model). |
|
lum_civ1551_outercgm |
\(\rm{L_{CIV 1551} (R_{200c}/2 - R_{200c})}\) |
\(\rm{erg/s}\) |
CIV 1551 luminosity in the outer CGM. |
|
lum_civ1551_innercgm |
\(\rm{L_{CIV 1551} (20 kpc - R_{200c}/2)}\) |
\(\rm{erg/s}\) |
CIV 1551 luminosity in the inner CGM. |
|
lum_heii1640_outercgm |
\(\rm{L_{HeII 1640} (R_{200c}/2 - R_{200c})}\) |
\(\rm{erg/s}\) |
HeII 1640 luminosity in the outer CGM. |
|
lum_heii1640_innercgm |
\(\rm{L_{HeII 1640} (20 kpc - R_{200c}/2)}\) |
\(\rm{erg/s}\) |
HeII 1640 luminosity in the inner CGM. |
|
mg2_lum |
\(\rm{L_{MgII}}\) |
\(\rm{erg/s}\) |
MgII emission, total luminosity. |
|
mg2_lumsize |
L \(_{\rm MgII}\) Half-light Radius |
kpc |
MgII emission, size (half-light radius). |
|
mg2_lumsize_rel |
L \(_{\rm MgII}\) Half-light Radius / R \(_{\rm 1/2,\star}\) |
– |
MgII emission, size (half-light radius) relative to stellar half mass radius. |
|
mg2_m20 |
MgII Emission M \(_{\rm 20}\) Index |
– |
MgII emission, M20 statistic. |
|
mg2_concentration |
MgII Emission Concentration (C) |
– |
MgII emission, concentration statistic. |
|
z_stars_masswt |
\(\rm{Z_{\star,masswt}}\) |
\(\rm{Z_{\odot}}\) |
Stellar metallicity (no radial restriction), mass weighted. |
|
z_stars_1kpc_masswt |
\(\rm{Z_{\star,masswt}}\) |
\(\rm{Z_{\odot}}\) |
Stellar metallicity (within 1 kpc, fof-scope), mass weighted. |
|
z_stars_2rhalfstarsfof_masswt |
\(\rm{Z_{\star,masswt}}\) |
\(\rm{Z_{\odot}}\) |
Stellar metallicity (within 2rhalfstars of fof, and fof-scope), mass weighted. |
|
z_stars_fof_masswt |
\(\rm{Z_{\star,masswt}}\) |
\(\rm{Z_{\odot}}\) |
Stellar metallicity (full fof-scope), mass weighted. All satellites have same value as their central. |
|
z_gas_sfrwt |
\(\rm{Z_{gas,sfrwt}}\) |
\(\rm{Z_{\odot}}\) |
Gas-phase metallicity (no radial restriction), mass weighted. |
|
z_stars_halo |
\(\rm{Z_{stars,halo}}\) |
\(\rm{Z_{\odot}}\) |
Mean stellar metallicity in the halo (0.15 < r/rvir < 1.0), mass weighted. |
|
z_gas_halo |
\(\rm{Z_{gas,halo}}\) |
\(\rm{Z_{\odot}}\) |
Mean gas metallicity in the halo (0.15 < r/rvir < 1.0), mass weighted. |
|
veldisp |
\(\rm{\sigma_{\star}}\) |
\(\rm{km/s}\) |
Stellar velocity dispersion (3D), within the stellar half mass radius. |
|
veldisp1d |
\(\rm{\sigma_{\star, 1D}}\) |
\(\rm{km/s}\) |
Stellar velocity dispersion (1D, from 3D), within the stellar half mass radius. |
|
veldisp1d_05re |
\(\rm{\sigma_{\star, 1D}}\) |
\(\rm{km/s}\) |
Stellar velocity dispersion (1D, from 3D), within 0.5 times the stellar half mass radius. |
|
veldisp1d_10pkpc |
\(\rm{\sigma_{\star, 1D}}\) |
\(\rm{km/s}\) |
Stellar velocity dispersion (1D, in z-direction), within 10pkpc. |
|
veldisp1d_4pkpc2d |
\(\rm{\sigma_{\star, 1D}}\) |
\(\rm{km/s}\) |
Stellar velocity dispersion (1D, in z-direction), within 4pkpc (~SDSS fiber low-z) in 2D. |
|
veldisp_gas_01r500c_xray |
\(\rm{\sigma_{gas, 1D, X-ray, <0.1\,r500c}}\) |
\(\rm{km/s}\) |
Gas velocity dispersion (1D, in z-direction), weighted by 0.2-2 keV X-ray luminosity, within 0.1r500c. |
|
gas_vrad_2rhalf |
Gas v \(_{\rm rad,ISM}\) |
\(\rm{km/s}\) |
Mean gas radial velocity within the galaxy (< 2rhalfstars), mass-weighted. |
|
gas_vrad_halo |
Gas v \(_{\rm rad,halo}\) |
\(\rm{km/s}\) |
Mean gas radial velocity the halo (0.15 < r/rvir < 1), mass-weighted. |
|
rshock |
\(\rm{R_{shock}}\) |
\(\rm{kpc}\) |
Virial shock radius, fiducial model choice. |
|
rshock_rvir |
\(\rm{R_{shock} / R_{vir}}\) |
– |
Virial shock radius, fiducial model choice. Normalized. |
|
size_halpha |
r \(_{\rm 1/2,H\alpha}\) |
\(\rm{kpc}\) |
Half-light radius of H-alpha emission, based on SFR empirical relation. |
|
size_halpha_em |
r \(_{\rm 1/2,H\alpha}\) |
\(\rm{kpc}\) |
Half-light radius of H-alpha emission, based on cloudy. |
|
shape_q_sfrgas |
q \(_{\rm SFRgas}\) |
– |
Iterative ellipsoid shape measurement: axis ratio (q) of star-forming gas. |
|
shape_s_sfrgas |
s \(_{\rm SFRgas}\) |
– |
Iterative ellipsoid shape measurement: sphericity (s) of star-forming gas. |
|
shape_ratio_sfrgas |
(s/q) \(_{\rm SFRgas}\) |
– |
Iterative ellipsoid shape measurement: ratio (s/q) of star-forming gas. |
|
r80_stars |
R \(_{\rm 80,\star}\) |
\(\rm{kpc}\) |
3D radius enclosing 80% of stellar mass, non-standard. |
|
sigma1kpc_stars |
\(\Sigma_{\rm 1,\star}\) |
\(\rm{M_{\odot}\, kpc^{-2}}\) |
Stellar surface density within a central 1 pkpc (2D projected) aperture. |
|
rhalf_stars_fof |
r \(_{\rm 1/2,\star}\) |
\(\rm{kpc}\) |
rhalf_stars_fof_code |
Stellar half-mass radius, computed from all FoF-scope stars. |
shape_q_stars |
q \(_{\rm stars}\) |
– |
Iterative ellipsoid shape measurement: axis ratio (q) of stars. |
|
shape_s_stars |
s \(_{\rm stars}\) |
– |
Iterative ellipsoid shape measurement: sphericity (s) of stars. |
|
shape_ratio_stars |
(s/q) \(_{\rm stars}\) |
– |
Iterative ellipsoid shape measurement: ratio (s/q) of stars. |
|
krot_stars |
\(\kappa_{\rm stars, rot}\) |
– |
krot_stars1, krot_stars2 |
Galaxy disk kappa, fraction of stars in ordered rotation. |
krot_gas |
\(\kappa_{\rm gas, rot}\) |
– |
krot_gas1, krot_gas2 |
Galaxy disk kappa, fraction of gas in ordered rotation. |
krot_oriented_stars |
\(\kappa_{\rm stars, rot} (J_z > 0)\) |
– |
krot_oriented_stars1, krot_oriented_stars2 |
Galaxy disk kappa, fraction of stars in ordered rotation (J_z > 0). |
krot_oriented_gas |
\(\kappa_{\rm gas, rot} (J_z > 0)\) |
– |
krot_oriented_gas1, krot_oriented_gas2 |
Galaxy disk kappa, fraction of gas in ordered rotation (J_z > 0). |
arot_stars |
\(M_{\rm stars, counter-rot} / M_{\rm stars, total}\) |
– |
arot_stars1, arot_stars2 |
Galaxy disk, fraction of counter-rotating stars. |
arot_gas |
\(M_{\rm gas, counter-rot} / M_{\rm gas, total}\) |
– |
arot_gas1, arot_gas2 |
Galaxy disk, fraction of counter-rotating gas. |
specangmom_stars |
\(j_{\rm stars}\) |
kpc km/s |
specangmom_stars1, specangmom_stars2 |
Galaxy disk, specific angular momentum of stars. |
specangmom_gas |
\(j_{\rm gas}\) |
kpc km/s |
specangmom_gas1, specangmom_gas2 |
Galaxy disk, specific angular momentum of gas. |
m_bulge_counter_rot |
\(M_{\rm bulge}\) |
\(M_\odot\) |
M_bulge estimator: twice the counter-rotating stellar mass within the stellar half-mass radius. |
|
bmag_sfrgt0_masswt |
\(\rm{|B|_{ISM}}\) |
\(\rm{\mu G}\) |
bmag_sfrgt0_volwt |
Mean magnetic field amplitude in the ISM (star-forming gas), full subhalo, mass or volume weighted. |
bmag_2rhalf_masswt |
\(\rm{|B|_{ISM}}\) |
\(\rm{\mu G}\) |
bmag_2rhalf_volwt |
Mean magnetic field amplitude in the ISM (within 2rhalfstars), mass or volume weighted. |
bmag_halo_masswt |
\(\rm{|B|_{halo}}\) |
\(\rm{\mu G}\) |
bmag_halo_volwt |
Mean magnetic field amplitude in the halo (0.15 < r/rvir < 1.0), mass or volume weighted. |
bmag_r500_masswt |
\(\rm{|B|_{r500c}}\) |
\(\rm{\mu G}\) |
bmag_r500_volwt |
Mean magnetic field amplitude within r500c, mass or volume weighted. |
bmag_halfr500_masswt |
\(\rm{|B|_{0.5r500c}}\) |
\(\rm{\mu G}\) |
bmag_halfr500_volwt |
Mean magnetic field amplitude within 0.5 * r500c, mass or volume weighted. |
bmag_masswt |
\(\rm{|B|}\) |
\(\rm{\mu G}\) |
bmag_volwt |
Mean magnetic field amplitude (full subhalo), mass or volume weighted. |
pratio_halo_masswt |
\(P_{\rm B} / P_{\rm gas}\) (halo) |
– |
pratio_halo_volwt |
Ratio of magnetic to thermal gas pressure in the halo (0.15 < r/rvir < 1.0), mass or volume weighted. |
pratio_2rhalf_masswt |
\(P_{\rm B} / P_{\rm gas}\) (ISM) |
– |
pratio_2rhalf_volwt |
Ratio of magnetic to thermal gas pressure in the galaxy (r < 2rhalfstars), mass or volume weighted. |
bke_ratio_halo_masswt |
\(u_{\rm B} / u_{\rm KE}\) (halo) |
– |
bke_ratio_halo_volwt |
Ratio of magnetic to kinetic energy in the halo (0.15 < r/rvir < 1.0), mass or volume weighted. |
bke_ratio_2rhalf_masswt |
\(u_{\rm B} / u_{\rm KE}\) (ISM) |
– |
bke_ratio_2rhalf_volwt |
Ratio of magnetic to kinetic energy in the galaxy (r < 2rhalfstars), mass or volume weighted. |
ptot_gas_halo |
P \(_{\rm tot,gas}\) |
\(\rm{K/cm^3}\) |
Total gas thermal pressure in the halo (0.15 < r/rvir < 1.0). |
|
ptot_b_halo |
P \(_{\rm tot,B}\) |
\(\rm{K/cm^3}\) |
Total gas magnetic pressure in the halo (0.15 < r/rvir < 1.0). |
|
m_bh |
\(\rm{M_{BH}}\) |
\(\rm{M_{\odot}}\) |
Supermassive black hole mass (actual, i.e. starting from the seed mass). |
|
bh_mdot_edd |
\(\rm{\dot{M}_{BH} / \dot{M}_{Edd}}\) |
– |
Blackhole mass accretion rate normalized by its Eddington rate (for most massive BH in each subhalo). |
|
bh_bollum |
Blackhole \(L_{\rm bol}\) |
erg/s |
Blackhole bolometric luminosity (for most massive BH in each subhalo). |
|
bh_bollum_basic |
Blackhole \(L_{\rm bol}\) [basic] |
erg/s |
Blackhole bolometric luminosity, basic model (for most massive BH in each subhalo). |
|
bh_eddratio |
Blackhole \(\lambda_{\rm edd}\) |
– |
Blackhole Eddington ratio (for most massive BH in each subhalo). |
|
bh_dedt |
Blackhole \(\dot{E}_{\rm BH}\) |
erg/s |
Blackhole energy injection rate (for most massive BH in each subhalo). |
|
bh_mode |
Blackhole Mode [ 0=low/kinetic, 1=high/quasar ] |
– |
Blackhole feedback mode [0=low/kinetic, 1=high/quasar] (for most massive BH in each subhalo). |
|
bh_cumegy_low |
BH \(\int\) E \(_{\rm injected,low}\) |
erg |
Cumulative energy injected in the low (kinetic) accretion mode. |
|
bh_cumegy_high |
BH \(\int\) E \(_{\rm injected,high}\) |
erg |
Cumulative energy injected in the high (thermal/quasar) accretion mode. |
|
bh_cummass_low |
\(\int\) M \(_{\rm growth,low}\) |
\(M_\odot\) |
Cumulative mass accretion in the low (kinetic) accretion mode. |
|
bh_cummass_high |
\(\int\) M \(_{\rm growth,high}\) |
\(M_\odot\) |
Cumulative mass accretion in the high (thermal/quasar) accretion mode. |
|
bh_cumegy_ratio |
BH \(\int\) E \(_{\rm injected,high}\) / \(\int\) E \(_{\rm injected,low}\) |
– |
Ratio of cumulative energy injected in low vs. high accretion modes. |
|
bh_cumegy_ratioinv |
BH \(\int\) E \(_{\rm injected,low}\) / \(\int\) E \(_{\rm injected,high}\) |
– |
Ratio of cumulative energy injected in high vs. low accretion modes. |
|
bh_cummass_ratio |
BH \(\int\) M \(_{\rm growth,high}\) / \(\int\) M \(_{\rm growth,low}\) |
– |
Ratio of cumulative mass accretion in low vs. high accretion modes. |
|
wind_vel |
Wind Injection Velocity |
km/s |
Wind model: velocity at injection, from star-forming gas. |
|
wind_etam |
Wind Mass Loading \(\eta_{\rm M}\) |
– |
Wind model: mass loading at injection, from star-forming gas. |
|
wind_dedt |
Wind Energy Injection Rate \(\dot{E}_{\rm SN}\) |
erg/s |
Wind model: energy injection rate, from star-forming gas. |
|
wind_dpdt |
Wind Momentum Injection Rate \(\dot{P}_{\rm SN}\) |
erg/s |
Wind model: momemtum injection rate, from star-forming gas. |
|
zform |
\(\rm{z_{form}}\) |
– |
z_form |
Formation redshift (of the halo), at which the subhalo had half of its current mass. |
stellar_zform_vimos |
\(\rm{z_{form,\star}}\) |
– |
Stellar formation redshift (mass-weighted mean), using the VIMOS slit aperture of stars. |
|
stellarage |
\(\rm{log t_{age,\star}\) |
\(\rm{Gyr}\) |
Mean stellar age (mass-weighted), all stars in subhalo. |
|
stellarage_4pkpc |
\(\rm{log t_{age,\star}\) |
\(\rm{Gyr}\) |
Mean stellar age (r-band luminosity weighted), including only stars within a 4 pkpc aperture. |
|
fiber_ |
– |
fiber_zred, fiber_mass, fiber_logzsol, fiber_tau, fiber_tage, fiber_dust1, fiber_dust2 |
Mock SDSS fiber spectrum MCMC fit quantities. |
|
temp_halo |
\(\rm{log T_{halo}}\) |
\(\rm{K}\) |
temp_halo_volwt |
Mean gas temperature in the halo (0.15 < r/rvir < 1), mass or volume weighted. |
nh_halo |
\(\rm{log n_{H,halo}}\) |
\(\rm{cm^{-3}}\) |
nh_halo_volwt |
Mean hydrogen number density in the halo (0.15 < r/rvir < 1), mass or volume weighted. |
nh_2rhalf |
\(\rm{log n_{H,ISM}}\) |
\(\rm{cm^{-3}}\) |
nh_2rhalf_volwt |
Mean hydrogen number density in the galaxy (< 2rhalfstars), mass or volume weighted. |
subhalo_id |
Subhalo ID |
– |
subhalo_index, id, index |
Subhalo ID/index. |
central_flag |
Central Flag (0=no, 1=yes) |
– |
cen_flag, is_cen, is_central |
Subhalo central flag (1 if central, 0 if not). |
contam_frac |
Low-res Contamination Fraction |
– |
Subhalo contamination fraction (low-res DM to total DM particle count). |
|
redshift |
Redshift |
– |
Redshift, i.e. constant for all subhalos. |
|
mhalo_200 |
Halo Mass \(\rm{M_{200c}}\) |
\(\rm{M_{sun}}\) |
mhalo_200_code, mhalo_200_parent, m200, m200c, mhalo |
Parent halo total mass (\(\rm{M_{200,crit}}\)). Only defined for centrals: satellites are assigned a value of nan (excluded by default), unless ‘_parent’ is specified in the field name, in which case satellites are given the same host halo mass as their central. |
mhalo_500 |
Halo Mass \(\rm{M_{500c}}\) |
\(\rm{M_{sun}}\) |
mhalo_500_code, mhalo_500_parent, m500, m500c |
Parent halo total mass (\(\rm{M_{500,crit}}\)). Only defined for centrals: satellites are assigned a value of nan (excluded by default). |
mhalo_vir |
Halo Mass \(\rm{M_{vir}}\) |
\(\rm{M_{sun}}\) |
mhalo_vir_code, mhalo_vir_parent |
Parent halo total mass (\(\rm{M_{vir}}\)). Defined by \(\rm{M_{\Delta}}\) where \(\Delta\) is the overdensity based on spherical tophat collapse. Only defined for centrals: satellites are assigned a value of nan (excluded by default). |
rhalo_200 |
\(\rm{R_{halo,200c}}\) |
\(\rm{kpc}\) |
rhalo_200_code, rhalo_200_parent, rhalo, r200, rhalo_200, rvir |
Parent halo virial radius (\(\rm{R_{200,crit}}\)). Only defined for centrals: satellites are assigned a value of nan (excluded by default). |
rhalo_500 |
\(\rm{R_{halo,500c}}\) |
\(\rm{kpc}\) |
rhalo_500_code, rhalo_500_parent, r500, rhalo_500 |
Parent halo \(\rm{R_{500,crit}}\) radius. Only defined for centrals: satellites are assigned a value of nan (excluded by default). |
vhalo |
\(\rm{v_{200,halo}}\) |
\(\rm{km/s}\) |
v200, vvir |
Parent halo virial velocity (\(\rm{V_{200}}\)). Only defined for centrals: satellites are assigned a value of nan (excluded by default). |
halo_numsubs |
\(\rm{N_{sub}}\) in Halo |
– |
halo_nsubs, nsubs, numsubs |
Total number of subhalos in parent dark matter halo. A value of one implies only a central subhalo exists, while a value of two indicates a central and one satellite, and so on. Only defined for centrals: satellites are assigned a value of nan (excluded by default). |
virtemp |
\(\rm{T_{vir}}\) |
\(\rm{K}\) |
tvir |
Virial temperature of the parent halo (satellites have NaN). |
distance |
Radial Distance |
\(\rm{kpc}\) |
rdist_code, rdist, rdist_rvir, distance_code, distance_rvir |
Radial distance of satellites to center of parent halo (centrals have zero). |
mhalo_subfind |
Subhalo Mass \(\rm{M_{grav}}\) |
\(\rm{M_{sun}}\) |
Parent dark matter (sub)halo total mass, defined by the gravitationally bound mass as determined by Subfind. |
|
mstar1 |
\(\rm{M_{\star}}\) |
\(\rm{M_{sun}}\) |
Galaxy stellar mass, measured within the stellar half mass radius. |
|
mstar2 |
\(\rm{M_{\star}}\) |
\(\rm{M_{sun}}\) |
Galaxy stellar mass, measured within twice the stellar half mass radius. |
|
mstar_tot |
\(\rm{M_{\star}}\) |
\(\rm{M_{sun}}\) |
Galaxy stellar mass, total subhalo/subfind value. |
|
mstar_fof |
\(\rm{M_{\star,fof}}\) |
\(\rm{M_{sun}}\) |
Galaxy stellar mass, total halo (FoF) value. All satellites have same value as their central. |
|
mgas1 |
\(\rm{M_{gas}}\) |
\(\rm{M_{sun}}\) |
Galaxy gas mass (all phases), measured within the stellar half mass radius. |
|
mgas2 |
\(\rm{M_{gas}}\) |
\(\rm{M_{sun}}\) |
Galaxy gas mass (all phases), measured within twice the stellar half mass radius. |
|
mgas_tot |
\(\rm{M_{gas}}\) |
\(\rm{M_{sun}}\) |
Galaxy gas mass, total subhalo/subfind value. |
|
mdm_tot |
\(\rm{M_{DM}}\) |
\(\rm{M_{sun}}\) |
Galaxy DM mass, total subhalo/subfind value. |
|
mstar_100pkpc |
\(\rm{M_{\star, <30kpc}}\) |
\(\rm{M_{sun}}\) |
mstar_100kpc |
Galaxy stellar mass, measured within a fixed 3D aperture of 100 physical kpc. |
mstar_30pkpc |
\(\rm{M_{\star, <30kpc}}\) |
\(\rm{M_{sun}}\) |
mstar_30kpc |
Galaxy stellar mass, measured within a fixed 3D aperture of 30 physical kpc. |
mstar_5pkpc |
\(\rm{M_{\star, <5kpc}}\) |
\(\rm{M_{sun}}\) |
Galaxy stellar mass, measured within a fixed 3D aperture of 5 physical kpc. |
|
mgas_5pkpc |
\(\rm{M_{gas, <5kpc}}\) |
\(\rm{M_{sun}}\) |
Galaxy gas mass, measured within a fixed 3D aperture of 5 physical kpc. |
|
mdm_5pkpc |
\(\rm{M_{DM, <5kpc}}\) |
\(\rm{M_{sun}}\) |
Galaxy dark matter mass, measured within a fixed 3D aperture of 5 physical kpc. |
|
mtot_5pkpc |
\(\rm{M_{total, <5kpc}}\) |
\(\rm{M_{sun}}\) |
Galaxy total mass (gas + stars + DM + BHs), measured within a fixed 3D aperture of 5 physical kpc. |
|
mstar_mtot_ratio_5pkpc |
\(\rm{M_{\star} / M_{total} (<5kpc)}\) |
– |
Ratio of galaxy stellar mass, to total mass, both measured within a 3D aperture of 5 physical kpc. |
|
mstar2_mhalo200_ratio |
\(\rm{M_{\star, <2r_{\star}} / M_{halo,200c}}\) |
– |
Galaxy stellar mass to halo mass ratio, the former defined as within twice the stellar half mass radius, the latter as M_200_Crit. |
|
mstar30pkpc_mhalo200_ratio |
\(\rm{M_{\star, <30pkpc} / M_{halo,200c}}\) |
– |
mstar_mhalo_ratio |
Galaxy stellar mass to halo mass ratio, the former measured within a fixed 3D aperture of 30 physical kpc, the latter taken as M_200_Crit. |
mstar_r500 |
\(\rm{M_{\star, <r500}}\) |
\(\rm{M_{sun}}\) |
Subhalo stellar mass (i.e. central+ICL, but no sats), measured within \(\rm{R_{500c}}\). |
|
mgas_r500 |
\(\rm{M_{gas, <r500}}\) |
\(\rm{M_{sun}}\) |
Subhalo gas mass (all phases), measured within \(\rm{R_{500c}}\). |
|
mgas_halo |
\(\rm{M_{gas, halo}}\) |
\(\rm{M_{sun}}\) |
Halo-scale gas mass, measured within each FoF. |
|
mhi |
\(\rm{M_{HI, grav}}\) |
\(\rm{M_{sun}}\) |
Galaxy atomic HI gas mass (BR06 molecular H2 model), measured within the entire subhalo (all gravitationally bound gas). |
|
mhi2 |
\(\rm{M_{HI, <2r_{\star}}}\) |
\(\rm{M_{sun}}\) |
Galaxy atomic HI gas mass (BR06 molecular H2 model), measured within twice the stellar half mass radius. |
|
mhi_30pkpc |
\(\rm{M_{HI, <30kpc}}\) |
\(\rm{M_{sun}}\) |
Galaxy atomic HI gas mass (BR06 molecular H2 model), measured within a fixed 3D aperture of 30 physical kpc. |
|
mhi_halo |
\(\rm{M_{HI, halo}}\) |
\(\rm{M_{sun}}\) |
Halo-scale atomic HI gas mass (BR06 molecular H2 model), measured within each FoF. |
|
fgas1 |
\(\rm{f_{gas} = M_{\rm gas} / (M_{gas} + M_\star) (<r_{\star})}\) |
– |
fgas1_alt |
Galaxy gas mass fraction (all phases), measured within the stellar half mass radius. |
fgas2 |
\(\rm{f_{gas} = M_{\rm gas} / (M_{gas} + M_\star) (<2r_{\star})}\) |
– |
fgas2_alt |
Galaxy gas mass fraction (all phases), measured within twice the stellar half mass radius. |
fgas |
\(\rm{f_{gas} = M_{\rm gas} / (M_{gas} + M_\star)}\) |
– |
fgas_alt |
Galaxy gas mass fraction (all phases), measured within the entire subhalo. |
fdm |
\(\rm{f_{dm} = M_{\rm dm} / M_{\rm tot}}\) |
– |
Galaxy DM fraction, measured within the entire subhalo. |
|
fdm1 |
\(\rm{f_{dm} = M_{\rm dm} / M_{\rm tot}}\) |
– |
Galaxy DM fraction, measured within the stellar half mass radius. |
|
fdm2 |
\(\rm{f_{dm} = M_{\rm dm} / M_{\rm tot}}\) |
– |
Galaxy DM fraction, measured within twice the stellar half mass radius. |
|
sfr1 |
\(\rm{SFR_{<r_{\star},instant}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Galaxy star formation rate (instantaneous, within one times the stellar half mass radius). |
|
sfr2 |
\(\rm{SFR_{<2r_{\star},instant}}\) |
\(\rm{M_{sun}\, yr^{-1}}\) |
Galaxy star formation rate (instantaneous, within twice the stellar half mass radius). |
|
sfr1_surfdens |
\(\rm{\Sigma_{SFR,<r_{\star},instant}}\) |
\(\rm{M_{sun}\, yr^{-1}\, kpc^{-2}}\) |
Galaxy star formation rate surface density (instantaneous, within one times the stellar half mass radius). |
|
sfr2_surfdens |
\(\rm{\Sigma_{SFR,<2r_{\star},instant}}\) |
\(\rm{M_{sun}\, yr^{-1}\, kpc^{-2}}\) |
Galaxy star formation rate surface density (instantaneous, within twice the stellar half mass radius). |
|
ssfr |
\(\rm{sSFR_{<2r_{\star},instant}}\) |
\(\rm{yr^{-1}}\) |
Galaxy specific star formation rate [1/yr] (sSFR, instantaneous, both SFR and M* within 2rhalfstars). |
|
ssfr_gyr |
\(\rm{sSFR_{<2r_{\star}}}\) |
\(\rm{Gyr^{-1}}\) |
Galaxy specific star formation rate [1/Gyr] (sSFR, instantaneous, both SFR and M* within 2rhalfstars). |
|
delta_sfms |
\(\rm{\Delta SFMS}\) |
dex |
Offset from the star-formation main sequence (SFMS), taken as the clipped sim median, in dex. |
|
z_stars |
\(\rm{Z_{\star}}\) |
\(\rm{Z_\odot}\) |
Galaxy stellar metallicity, mass-weighted average of all star particles within 2rhalfstars. |
|
z_gas |
\(\rm{Z_{gas}}\) |
\(\rm{Z_\odot}\) |
Galaxy gas metallicity, mass-weighted average of all gas cells within 2rhalfstars. |
|
z_gas_sfr |
\(\rm{Z_{gas}}}\) |
\(\rm{Z_\odot}\) |
Galaxy gas metallicity, SFR-weighted average of all gas cells within 2rhalfstars. |
|
size_stars |
r \(_{\rm 1/2,\star}\) |
\(\rm{kpc}\) |
rhalf_stars, size_stars_code, rhalf_stars_code |
Stellar half mass radius. |
re_rvir_ratio |
r \(_{\rm 1/2,\star}\) / R \(_{\rm vir,halo}\) |
– |
size_stars_rvir_ratio |
Stellar half mass radius normalized by parent halo virial radius (r200c). |
size_gas |
r \(_{\rm 1/2,gas}\) |
\(\rm{kpc}\) |
rhalf_gas, size_gas_code, rhalf_gas_code |
Gas half mass radius. |
surfdens1_stars |
\(\rm{\Sigma_{*,<r_{\star}}}\) |
\(\rm{M_{sun}\, kpc^{-2}}\) |
Galaxy stellar surface density (within the stellar half mass radius). |
|
surfdens2_stars |
\(\rm{\Sigma_{*,<2r_{\star}}}\) |
\(\rm{M_{sun}\, kpc^{-2}}\) |
Galaxy stellar surface density (within twice the stellar half mass radius). |
|
surfdens1_dm |
\(\rm{\Sigma_{DM,<r_{\star}}}\) |
\(\rm{M_{sun}\, kpc^{-2}}\) |
Galaxy DM surface density (within the stellar half mass radius). |
|
vcirc |
\(\rm{V_{circ}}\) |
\(\rm{km/s}\) |
vc, vmax |
Maximum value of the spherically-averaged 3D circular velocity curve (i.e. galaxy circular velocity). |
velmag |
\(\rm{|V|_{subhalo}}\) |
\(\rm{km/s}\) |
vmag |
The magnitude of the current velocity of the subhalo through the box, in the simulation reference frame. |
spinmag |
\(\rm{|S|_{subhalo}}\) |
\(\rm{kpc km/s}\) |
smag |
The magnitude of the subhalo spin vector, computed as the mass weighted sum of all subhalo particles/cells. |
m_v |
M \(_{\rm V}\) |
abs AB mag |
m_u, m_b, m_r |
V-band (B-band, r-band, …) magnitude (StellarPhotometrics from snapshot). AB system. No dust. |
color_uv |
(U-V) color |
mag |
color_vb |
Integrated photometric/broadband galaxy colors, from snapshot. AB system. No dust. |
massfrac_exsitu |
Ex-Situ Stellar Mass Fraction |
– |
massfrac_exsitu2, massfrac_insitu, massfrac_insitu2 |
Postprocessing/StellarAssembly: ex-situ or in-situ stellar mass fraction. Within the stellar half mass radius, unless ‘2’ in field name, in which case within 2*rhalf. |
mergers_mean_fgas |
Mean Gas Fraction of Mergers |
– |
Postprocessing/MergerHistory: mean property (‘cold’ i.e. star-forming gas fraction) of mergers. Weighted by the maximum stellar mass of the secondary progenitors. |
|
mergers_mean_z |
Redshift |
– |
Postprocessing/MergerHistory: mean property (redshift) of all mergers this subhalo gas undergone. Weighted by the maximum stellar mass of the secondary progenitors. |
|
mergers_mean_mu |
Mean Stellar Mass Ratio of Mergers |
– |
Postprocessing/MergerHistory: mean property (stellar mass ratio) of mergers. Weighted by the maximum stellar mass of the secondary progenitors. |
|
coolcore_flag |
Cool-core Flag (0=CC, 1=WCC, 2=NCC) |
– |
Postprocessing/coolcore_criteria: flag (0=SCC, 1=WCC, 2=NCC) based on Lehle+24 tcool fiducial definition. |
|
coolcore_tcool |
Central \(t_{\rm cool}\) |
Gyr |
tcool0 |
Postprocessing/coolcore_criteria: Lehle+24 central cooling time. |
coolcore_entropy |
Central \(K_0\) |
keV cm \(^2\) |
K0 |
Postprocessing/coolcore_criteria: Lehle+24 central cooling time. |
coolcore_ne |
Central \(n_e\) |
cm \(^{-3}\) |
Postprocessing/coolcore_criteria: Lehle+24 central electron number density. |
|
coolcore_ne_slope |
n_{rm e} slope ( \(\alpha\) |
– |
Postprocessing/coolcore_criteria: Lehle+24 central slope of number density. |
|
coolcore_c_phys |
C_{rm phys} |
– |
Postprocessing/coolcore_criteria: Lehle+24 X-ray concentration (40kpc vs 400kpc), physical. |
|
coolcore_c_scaled |
C_{rm phys} |
– |
Postprocessing/coolcore_criteria: Lehle+24 X-ray concentration (40kpc vs 400kpc), scaled. |
|
peakoffset_xray |
\(\Delta x_{\rm X-ray}\) |
\(\rm{kpc}\) |
peakoffset_xray_x, peakoffset_xray_y, peakoffset_xray_z |
Postprocessing/released: Nelson+24 offsets of X-ray peaks [pkpc]. |
peakoffset_sz |
\(\Delta x_{\rm SZ}\) |
\(\rm{kpc}\) |
peakoffset_sz_x, peakoffset_sz_y, peakoffset_sz_z |
Postprocessing/released: Nelson+24 offsets of SZ peaks [pkpc]. |
fcirc_all_eps07o |
\(\rm{f_{circ, \epsilon > 0.7}}\) |
– |
fcirc, fcirc_10re_eps07o |
Postprocessing/circularities/: fraction of disk-stars (circularity > 0.7), all stars in subhalo. |
fcirc_all_eps07m |
\(\rm{f_{circ, \epsilon > 0.7 - \epsilon < -0.7}}\) |
– |
fcirc_10re_eps07m |
Postprocessing/circularities/: fraction of disk-stars (circularity > 0.7), all stars in subhalo. |
slit_vrot_halpha |
\(V_{\rm rot, H\alpha}\) |
km/s |
Postprocessing/galskitkinematics/: Disk rotation velocity based on H-alpha emission. |
|
slit_vrot_stars |
\(V_{\rm rot, V-band}\) |
km/s |
Postprocessing/galskitkinematics/: Disk rotation velocity based on stellar light. |
|
slit_vsigma_halpha |
\(\sigma_{\rm vel, los, H\alpha}\) |
km/s |
Postprocessing/galskitkinematics/: Disk velocity dispersion based on H-alpha emission. |
|
slit_vsigma_stars |
\(\sigma_{\rm vel, los, V-band}\) |
km/s |
Postprocessing/galskitkinematics/: Disk velocity dispersion based on stellar light. |
|
slit_voversigma_halpha |
\(V_{\rm rot}\) / \(\sigma_{\rm vel,los}\) [H-alpha] |
– |
Postprocessing/galskitkinematics/: Disk rotational support (V/sigma) based on H-alpha emission. |
|
slit_voversigma_stars |
\(V_{\rm rot}\) / \(\sigma_{\rm vel,los}\) [V-band] |
– |
Postprocessing/galskitkinematics/: Disk rotational support (V/sigma) based on stellar light. |
|
size2d_halpha |
Projected 2D Size r \(_{\rm H-alpha,1/2}\) |
kpc |
Postprocessing/galsizes/: Galaxy disk size (from 2D projection) based on H-alpha emission. |
|
size2d_stars |
Projected 2D Size r \(_{\rm V-band,1/2}\) |
kpc |
Postprocessing/galsizes/: Galaxy disk size (from 2D projection) based on stellar light. |
|
diskheight2d_halpha |
Projected 2D Disk Height h \(_{\rm H-alpha,1/2}\) |
kpc |
Postprocessing/galsizes/: Galaxy disk scale-height (from 2D projection) based on H-alpha emission. |
|
diskheight2d_stars |
Projected 2D Disk Height h \(_{\rm V-band,1/2}\) |
kpc |
Postprocessing/galsizes/: Galaxy disk scale-height (from 2D projection) based on stellar light. |
|
diskheightnorm2d_halpha |
Normalized Disk Height \(\rm{(h/r)_{H-alpha}}\) |
– |
Postprocessing/galsizes/: Galaxy disk normalized scale-height (h/r) based on H-alpha emission. |
|
diskheightnorm2d_stars |
Normalized Disk Height \(\rm{(h/r)_{V-band}}\) |
– |
Postprocessing/galsizes/: Galaxy disk normalized scale-height (h/r) based on stellar light. |
|
mstar_out_10kpc |
Stellar Mass (r > 10 pkpc) |
Msun |
data.files/pillepich/: Stellar mass outside of 10 kpc. |
|
d_minima |
Distance to Nearest Void |
Mpc |
Postprocessing/disperse/: Distance to nearest cosmic web structure (minima = void), from disperse. |
|
d_node |
Distance to Nearest Halo |
Mpc |
Postprocessing/disperse/: Distance to nearest cosmic web structure (node = halo), from disperse. |
|
d_skel |
Distance to Nearest Filament |
Mpc |
Postprocessing/disperse/: Distance to nearest cosmic web structure (skel = filament), from disperse. |
Custom Snapshot Quantities
The following particle/cell-level custom quantities are currently defined, in the
temet.load.snap_fields_custom module, along with associated metadata including
a description, units, reasonable bounds, and so on.
Field Name |
Label |
Units |
Aliases |
Description |
|---|---|---|---|---|
mass_msun |
Mass |
\(\rm{M_{sun}}\) |
Particle/cell mass in solar masses. |
|
mass |
High-Res Mass Fraction |
– |
masses |
Particle/cell mass in code units, supporting constant-mass DM particles. |
highres_massfrac |
– |
High-resolution mass normalized by total mass (applicable only to zooms). |
||
velmag |
Velocity Magnitude |
\(\rm{km/s}\) |
vmag |
Magnitude of the gas velocity 3-vector. |
subfind_vol |
Subfind Volume |
code_volume |
subfind_volume |
Particle ‘volume’ based on SubfindHsml of the N=64 nearest DM particles. |
gravpot |
Gravitational Potential |
\(\rm{(km/s)^2}\) |
gravpotential |
Gravitational potential (from stored value in snapshot). |
vesc |
Escape Velocity |
\(\rm{km/s}\) |
escapevel |
Escape velocity, based on the stored gravitational Potential. |
dt |
Timestep |
\(\rm{yr}\) |
dt_yr |
Particle/cell total actual/effective timestep, from stored snapshot value. |
temp |
Gas Temperature |
\(\rm{K}\) |
temperature |
Gas temperature. |
temp_old |
Gas Temperature (Uncorrected) |
\(\rm{K}\) |
Gas temperature (uncorrected values for TNG runs). |
|
temp_sfcold |
Gas Temperature |
\(\rm{K}\) |
Gas temperature, where star-forming gas is set to the sub-grid (constant) cold-phase temperature, instead of eEOS ‘effective’ temperature. |
|
temp_sfhot |
Gas Temperature |
\(\rm{K}\) |
Gas temperature, where star-forming gas is set to the sub-grid (constant) hot-phase temperature, instead of the eEOS ‘effective’ temperature. Use with caution. |
|
twophase_coldfrac |
SH03 Cold-phase Mass Fraction |
– |
Cold-phase mass (or density) fraction, for the SH03 two-phase ISM model. Note: is exactly 0.0 for non-starforming (SFR==0) gas cells, and typically of order ~0.9 for SFR>0 cells. |
|
ne |
Electron Number Density \(\rm{n_e}\) |
\(\rm{cm^{-3}}\) |
nelec |
Electron number density, derived from (fractional) ElectronAbundance, handling runs without cooling. |
ne_twophase |
Hot-phase Electron Number Density \(\rm{n_e}\) |
\(\rm{cm^{-3}}\) |
Electron number density, where for star-forming gas cells we override the naive snapshot value, which is unphysically high, with a value based on the SH03 hot-phase mass only. |
|
nh |
Gas Hydrogen Density \(\rm{n_H}\) |
\(\rm{cm^{-3}}\) |
hdens |
Hydrogen number density, derived from total Density. |
xhi |
Neutral Hydrogen Mass Fraction \(\rm{x_{HI}}\) |
– |
massfrac_hi |
Neutral hydrogen fraction, relative to the total gas mass. No H2 model applied. |
numdens |
Gas Number Density |
\(\rm{cm^{-3}}\) |
Total gas number density, derived from total Density. |
|
dens_critratio |
\(\rm{\rho_{gas} / \rho_{crit}}\) |
– |
Mass density to critical density. |
|
dens_critb |
\(\rm{\rho_{gas} / \rho_{crit,b}}\) |
– |
Mass density to critical baryon density. |
|
entropy |
Gas Entropy |
\(\rm{K\ cm^2}\) |
ent, entr |
Gas entropy, derived from (u,dens). |
bmag |
Magnetic Field Strength |
\(\rm{Gauss}\) |
bfieldmag |
Magnitude of the gas magnetic field 3-vector in Gauss. |
bmag_ug |
Magnetic Field Strength |
\(\rm{\mu G}\) |
bfieldmag_ug |
Magnitude of the gas magnetic field 3-vector in micro-Gauss. |
b2 |
Magnetic Field Squared |
code units |
Magnitude squared of the gas magnetic field 3-vector (in code units). |
|
va |
Alfven Velocity |
\(\rm{km/s}\) |
vel_alfven |
Magnetic Alfven-wave velocity. |
cs |
Sound Speed |
\(\rm{km/s}\) |
vel_sound, csound, csnd |
Gas sound speed (hydro only version). |
mjeans |
Jeans Mass |
\(\rm{M_{sun}}\) |
jeans_mass |
Local (per-cell) Jeans mass. |
tff_local |
Free-fall Time |
\(\rm{yr}\) |
tff_cell |
Local (per-cell) free-fall time. |
volume |
Gas Cell Volume |
(code_length) \(^3\) |
vol |
Gas cell volume. |
volume_cm3 |
Gas Cell Volume |
\(\rm{cm^3}\) |
vol_cm3 |
Gas cell volume [cm^3]. |
volume_kpc3 |
Gas Cell Volume |
\(\rm{kpc^3}\) |
vol_kpc3 |
Gas cell volume [kpc^3]. |
cellsize |
Gas Cell Size |
code_length |
cellrad |
Gas cell ‘size’ i.e. ‘cell radius’, defined as the radius of the volume equivalent sphere. |
cellsize_kpc |
Gas Cell Size |
\(\rm{kpc}\) |
cellrad_kpc |
Gas cell size [kpc]. |
cellsize_ckpc |
Gas Cell Size |
\(\rm{ckpc}\) |
cellrad_ckpc |
Gas cell size [comoving kpc]. |
hsml |
Smoothing Length |
code_length |
Smoothing length i.e. characteristic size, possibly for visualization purposes. |
|
f_b |
\(\rm{f_{b} / f_{b,cosmic}}\) |
– |
baryon_frac |
Baryon fraction, defined as (gas+stars)/(gas+stars+DM), all estimated locally, then normalized to the cosmic baryon fraction. |
pressure |
Gas Pressure |
\(\rm{K\ cm^{-3}}\) |
gas_pres, gas_pressure, pres, p_gas, p_thermal |
Gas thermal pressure. |
pressure_mag |
Gas Magnetic Pressure |
\(\rm{K\ cm^{-3}}\) |
mag_pres, magnetic_pressure, p_magnetic, p_b |
Gas magnetic pressure. |
pressure_ratio |
\(\rm{\beta^{-1} = P_{B} / P_{gas}}\) |
– |
pres_ratio |
Ratio of gas magnetic to thermal pressure (\(\beta^{-1}\)). |
beta |
\(\rm{\beta = P_{gas} / P_{B}}\) |
– |
Ratio of gas thermal to magnetic pressure (plasma \(\beta\)). |
|
pressure_tot |
Gas Total Pressure = \(\rm{P_{gas} + P_{B}}\) |
\(\rm{K\ cm^{-3}}\) |
p_tot, pres_tot, pres_total, pressure_total |
Total (thermal+magnetic) gas pressure. |
u_kinetic |
Gas Kinetic Energy Density |
\(\rm{erg\ cm^{-3}}\) |
u_ke, kinetic_edens, kinetic_energydens |
Kinetic, as opposed to thermal, energy density. |
uratio_mag_ke |
Gas ( \(\rm{u_{mag} / u_{ke}}\) ) Ratio |
– |
uratio_b_ke, u_b_ke_ratio, b_ke_edens_ratio |
Ratio of gas magnetic to kinetic energy density. |
tcool |
Gas Cooling Time |
\(\rm{Gyr}\) |
cooltime |
Gas cooling time (computed from saved GFM_CoolingRate), is np.nan if cell has net heating. |
coolrate |
Gas Cooling Rate |
\(\rm{erg/s/g}\) |
coolingrate |
Gas specific cooling rate (computed from saved GFM_CoolingRate), is np.nan if cell has net heating. |
heatrate |
Gas Heating Rate |
\(\rm{erg/s/g}\) |
heatingrate |
Gas specific heating rate (computed from saved GFM_CoolingRate), is np.nan if cell has net cooling. |
netcoolrate |
Gas Net Cooling Rate |
\(\rm{erg/s/g}\) |
Gas net specific cooling rate (computed from saved GFM_CoolingRate). |
|
coolrate_powell |
Powell Cooling Rate |
\(\rm{erg/s/g}\) |
Gas ‘cooling rate’ of Powell source term, specific (computed from saved DivB, GFM_CoolingRate). |
|
dt_hydro |
Gas Courant Timestep |
\(\rm{yr}\) |
dt_hydro_yr |
Gas cell hydrodynamical (Courant) timestep. |
tdep |
Gas Depletion Time |
\(\rm{Gyr}\) |
depletion_time, tau_dep |
Gas cell depletion time: cells with zero sfr given nan. |
metaldens |
Metal Density |
\(\rm{g\ cm^{-3}}\) |
dens_z, dens_metal |
Total metal mass density. |
h_massfrac |
H Mass Fraction |
– |
Total hydrogen (H) mass fraction. This is a custom helper for MCST runs where this value is not directly stored for gas, but is split based on sub-species and ionization state. |
|
he_massfrac |
He Mass Fraction |
– |
Total helium (He) mass fraction. This is a custom helper for MCST runs where this value is not directly stored for gas, but is split based on sub-species and ionization state. |
|
sz_y |
Sunyaev-Zeldovich y-parameter |
\(\rm{kpc^2}\) |
sz_yparam, yparam |
(Thermal) Sunyaev-Zeldovich y-parameter (per gas cell). |
ksz_y |
Kinetic SZ y-parameter |
\(\rm{kpc^2/g}\) |
ksz_yparam, ksz_y |
(Kinetic) Sunyaev-Zeldovich y-parameter (per gas cell). |
frm_x |
Faraday RM |
\(\rm{rad m^{-2}}\) |
frm_y, frm_z |
Faraday rotation measure -integrand- (ne*B_parallel) in [rad m^-2]. Must be integrated through all cells along a line of sight, as sum(integrand*dl) where dl is the pathlength through each cell in pc. Requires the B-field component ‘along the line-of-sight’ which must be axis-aligned and specified. |
p_sync |
Synchrotron Power |
\(\rm{W/Hz}\) |
p_sync_ska, p_sync_ska_eta43, p_sync_ska_alpha15, p_sync_vla |
Radio synchrotron power (simple model). |
halpha_lum |
\(\rm{L_{H\alpha}}\) |
\(\rm{10^{30}\ erg/s}\) |
halpha, sfr_halpha |
H-alpha line luminosity, simple model: linear conversion from SFR. |
s850um_flux |
\(\rm{S_{850\mu m}}\) |
\(\rm{mJy}\) |
submm_flux, s850um_flux_ismcut, submm_flux_ismcut |
850 micron (sub-mm) flux (simple model). |
xray_lum |
\(\rm{L_{X,bolometric}}\) |
\(\rm{10^{30}\ erg/s}\) |
xray |
Bolometric x-ray luminosity, simple bremsstrahlung (free-free) emission model only. |
xray_lum_apecX |
\(\rm{L_{X}}\) |
\(\rm{10^{30}\ erg/s}\) |
xray_lum_05-2kev, xray_flux_05-2kev, xray_lum_05-2kev_nomet, xray_flux_05-2kev_nomet, xray_counts_erosita, xray_counts_chandra, xray_lum_0.1-2.4kev, xray_lum_0.5-2.0kev, xray_lum_0.3-7.0kev, xray_lum_0.5-5.0kev, xray_lum_0.5-8.0kev, xray_lum_2.0-10.0kev |
X-ray luminosity/flux/counts (the latter for a given instrumental configuration). If a decimal point ‘.’ in field, using my APEC-based tables, otherwise using XSPEC-based tables (from Nhut). |
n_hi |
\(\rm{N_{HI}}\) |
\(\rm{cm^{-2}}\) |
hi_column |
Experimental: assign a N_HI (column density) to every cell based on a (xy) grid projection. |
hi_mass |
\(\rm{M_{HI}}\) |
code_mass |
mass_hi, h i mass, hi mass, h i numdens |
Hydrogen model: atomic H (neutral subtracting molecular) mass calculation. |
h2_mass |
\(\rm{M_{H2}}\) |
code_mass |
mass_h2, h2mass |
Hydrogen model: molecular H (neutral subtracting atomic) mass calculation. |
mass_h_poppingX |
\(\rm{M_{HI,H}}\) |
code_mass |
mhi_br, mhi_gk, mhi_kmt, mh2_br, mh2_gk, mh2_kmt |
Pre-computed atomic (HI) and molecular (H2) gas cell masses (from Popping+2019). |
numdens_h_poppingX |
\(\rm{n_{HI,H}}\) |
\(\rm{cm^{-3}}\) |
nhi_br, nhi_gk, nhi_kmt, nh2_br, nh2_gk, nh2_kmt |
Pre-computed atomic (HI) and molecular (H2) gas cell number densities (from Popping+2019). |
mass_h_diemerX |
\(\rm{M_{HI,H}}\) |
code_mass |
mhi_gd14, mhi_gk11, mhi_k13, mhi_s14, mh2_gd14, mh2_gk11, mh2_k13, mh2_s14 |
Pre-computed atomic (HI) and molecular (H2) gas cell masses (from Diemer+2019). |
numdens_h_diemerX |
\(\rm{n_{HI,H}}\) |
\(\rm{cm^{-3}}\) |
nhi_gd14, nhi_gk11, nhi_k13, nhi_s14, nh2_gd14, nh2_gk11, nh2_k13, nh2_s14 |
Pre-computed atomic (HI) and molecular (H2) gas cell number densities (from Diemer+2019). |
wind_dedt |
Wind Energy Injection Rate |
\(\rm{10^{51}\ erg/s}\) |
wind_edot, sn_dedt, sn_edot, sf_dedt, sf_edot |
TNG/SH03 wind model: feedback energy injection rate. |
wind_dpdt |
Wind Momentum Injection Rate |
\(\rm{10^{51}\ g\,cm\,s^{-2}}\) |
wind_pdot, sn_dpdt, sn_pdot, sf_dpdt, sf_pdot |
TNG/SH03 wind model: feedback momentum injection rate. |
wind_vel |
Wind Launch Velocity |
\(\rm{km/s}\) |
wind_launchvel |
TNG/SH03 wind model: launch velocity. |
wind_eta |
Wind Mass Loading \(\rm{\eta_m}\) |
– |
wind_massloading, wind_etam |
TNG/SH03 wind model: mass loading factor (at launch). |
rad_fuv |
FUV Radiation Energy Density |
erg cm \(^{-3}\) |
raddens_fuv, rad_fuv_habing, raddens_fuv_habing |
Radiation energy density in FUV band (6 - 13.6 eV). |
rad_lw |
LW Radiation Energy Density |
erg cm \(^{-3}\) |
raddens_lw, rad_lw_habing, raddens_lw_habing |
Radiation energy density in Lyman-Werner band (11.2 - 12.3 eV). |
rad_fuv_lw_ratio |
(FUV / LW) Radiation Ratio |
– |
Ratio of radiation energy density in FUV to Lyman-Werner band. |
|
rad_fuv_uvb_ratio |
(Local / UVB) FUV Radiation Ratio |
– |
Ratio of local to UVB radiation energy density in FUV band. |
|
z_solar |
Metallicity |
\(\rm{Z_{sun}}\) |
metal_solar |
Metallicity in solar units. |
sn_iaii_ratio_fe |
Mass Ratio \(\rm{Fe_{SNIa} / {Fe}_{SNII}}\) |
– |
GFM_MetalsTagged: ratio of iron mass [linear] produced in SNIa versus SNII. |
|
sn_iaii_ratio_metals |
Mass Ratio \(\rm{Z_{SNIa} / Z_{SNII}}\) |
– |
GFM_MetalsTagged: ratio of total metal mass [linear] produced in SNIa versus SNII. |
|
sn_ia_agb_ratio_metals |
Mass Ratio \(\rm{Z_{SNIa} / Z_{AGB}}\) |
– |
GFM_MetalsTagged: ratio of total metal mass [linear] produced in SNIa versus AGB. |
|
metalmass |
Metal Mass |
code_mass |
mass_z, mass_metal, metalmass_msun |
Total metal mass (convert GFM_Metals from fraction to mass). |
star_age |
Stellar Age |
\(\rm{Gyr}\) |
stellar_age |
Age of stellar population (conversion of GFM_StellarFormationTime). |
z_form |
Stellar Formation Redshift |
– |
z_formation |
Formation redshift of stellar population (conversion of GFM_StellarFormationTime). |
stellar_masshist |
– |
Stellar mass histogram (binned by mass) for a given snapshot. MCST model. |
||
bh_lbol |
\(\rm{L_{bol}}\) |
\(\rm{erg/s}\) |
bh_bollum, bh_bollum_obscured |
Black hole bolometric luminosity (optionally with obscuration). |
bh_lbol_basic |
\(\rm{L_{bol}}\) |
\(\rm{erg/s}\) |
bh_bollum_basic, bh_bollum_basic_obscured |
Black hole bolometric luminosity (simple model, optionally with obscuration). |
bh_lumedd |
\(\rm{L_{edd}}\) |
\(\rm{erg/s}\) |
ledd, lumedd, edd_ratio, bh_ledd, eddington_lum |
Black hole Eddington luminosity. |
bh_eddratio |
\(\rm{\lambda_{edd} = L_{bol} / L_{edd}}\) |
– |
eddington_ratio, lambda_edd, edd_ratio |
Black hole bolometric luminosity (optionally with obscuration). |
bh_mode |
BH mode (0=low, 1=high) |
– |
Black hole accretion/feedback mode (0=low/kinetic, 1=high/quasar). |
|
bh_dedt |
BH Energy Injection Rate |
\(\rm{erg/s}\) |
bh_edot |
Black hole feedback energy injection rate. |
pos_relX |
Halocentric Position |
code_length |
pos_rel_kpc, pos_rel_rvir |
3D (xyz) position, relative to the halo/subhalo center. |
vel_rel |
Halo-Relative Velocity |
\(\rm{km/s}\) |
vrel, halo_vrel, halo_relvel, relative_vel |
3D (xyz) velocity, relative to the halo/subhalo motion. |
vel_rel_mag |
Halo-Relative Velocity |
\(\rm{km/s}\) |
vrelmag, halo_vrelmag, relative_vmag |
Magnitude of velocity, relative to the halo/subhalo motion. |
radX |
Radial Distance |
code_length |
halo_rad, rad_r500, rad_rvir, halo_rad_r500, halo_rad_rvir |
3D radial distance from (parent) halo center. |
rad_kpc |
Radial Distance |
\(\rm{kpc}\) |
halo_rad_kpc, rad_kpc_linear |
3D radial distance from (parent) halo center in [kpc]. |
dist_2dz |
– |
dist_2dz_r200, dist_2dz_r500 |
2D distance (i.e. impact parameter), projecting along z-hat, from (parent) halo center. |
|
vradX |
Radial Velocity |
\(\rm{km/s}\) |
halo_vrad, radvel, halo_radvel, vrad_vvir, halo_vrad_vvir, halo_radvel_vvir |
Radial velocity, relative to the central subhalo and its motion, including hubble correction. Optionally normalized by the halo virial velocity. Convention: negative = in, positive = out. |
angmomX |
Specific Angular Momentum |
\(\rm{M_{sun}\ kpc\ km/s}\) |
j, specj, specangmom, angmom_mag, specj_mag, specangmom_mag |
Angular momentum, relative to the central subhalo and its motion, including hubble correction, either the 3-vector or the specific magnitude (if field contains ‘_mag’). |
menc |
Enclosed Mass |
code_mass |
enclosedmass |
Enclosed mass, i.e. total halo mass within the radial distance of each particle/cell. |
menc_msun |
Enclosed Mass |
\(\rm{M_{sun}}\) |
enclosedmass_msun |
Enclosed mass, in solar masses. |
tff |
Gravitational Free-Fall Time |
\(\rm{Gyr}\) |
tfreefall, freefalltime |
Gravitational free-fall time. |
tcool_tff |
\(\rm{t_{cool} / t_{ff}}\) |
– |
Ratio of gas cooling time to gravitational free-fall time. |
|
menc_vesc |
Escape Velocity |
\(\rm{km/s}\) |
Gravitational escape velocity (based on enclosed mass). |
|
delta_rho |
\(\delta \rho / <\rho>\) |
– |
Ratio of density to local mean density, delta_rho/<rho>, based on a spherically symmetric, halo-centric mass density profile. This is a special case of the below. |
|
subhalo_id |
Subhalo ID |
– |
subid, subhaloid |
Parent subhalo ID, per particle/cell. |
halo_id |
Halo ID |
– |
haloid |
Parent halo ID, per particle/cell. |
sat_member |
Satellite Member |
– |
True (1) if particle/cell belongs to a satellite subhalo, False (0) otherwise (central/inner fuzz/outer fuzz). |
The following ‘wildcard’ fields match any field request whose name contains the pattern.
Field Name |
Label |
Units |
Description |
|---|---|---|---|
tau0_X |
Optical Depth \(\rm{\tau_{X,0}}\) |
– |
Optical depth to a certain line, at line center. |
metaldens_X |
X Metal Density |
\(\rm{g\ cm^{-3}}\) |
Metal mass density for a given species, e.g. ‘metaldens_O’. |
{ion} {num} mass |
{ion} {num} Ionic Mass |
\(\rm{M_{sun}}\) |
CLOUDY-based photoionization calculation: total ionic mass (e.g. ‘O VI mass’, ‘Mg II mass’), for any known ion name and excited level number. Note: uses spaces in field name. |
{ion} {num} frac |
{ion} {num} Ionization Fraction |
– |
CLOUDY-based photoionization calculation: ionic mass fraction (e.g. ‘O VI frac’, ‘Mg II frac’), for a given ion name and excited level number. Note: uses spaces in field name. |
{ion} {num} numdens |
\(\rm{n_{\{ion\}\{num\}}}\) |
\(\rm{cm^{-3}}\) |
CLOUDY-based photoionization calculation: ionic number density (e.g. ‘O VI numdens’, ‘Mg II numdens’), for a given ion name and excited level number. Note: uses spaces in field name. |
{line_name} flux |
{line_name} Line Flux |
\(\rm{photon/s/cm^2}\) |
CLOUDY-based photoionization calculation: ion line emission flux (e.g. ‘H-alpha flux’, ‘O–6-1037.62A’), for a given line name. Note: uses spaces in field name. |
{line_name} lum |
{line_name} Luminosity |
\(\rm{10^{30}\ erg/s}\) |
CLOUDY-based photoionization calculation: ion line luminosity (e.g. ‘MgII lum’, ‘CVI lum’), for a given line name. Note: uses spaces in field name. |
ionmassratio_X_Y |
(X / Y) Mass Ratio |
– |
Ratio between two ionic masses, e.g. ‘ionmassratio_O6_O8’. |
numratio_X_Y |
\(\rm{[X/Y]_{}}\) |
– |
Metal abundance number density ratio e.g. ‘numratio_Si_H’, relative to solar, i.e. [Si/H]. |
massratio_X_Y |
Mass Ratio \(\rm{(X/Y)_{}}\) |
– |
Metal abundance mass ratio e.g. ‘massratio_Si_H’, absolute (not relative to solar). |
metalmass_X |
X Metal Mass |
code_mass |
Metal mass for a given species (convert GFM_Metals from fraction to mass), e.g. ‘metalmass_O’ or ‘metalmass_Mg’ or ‘metalmass_Fe_msun’. |
delta_X |
\(\rm{\delta X / <X>}\) |
– |
Ratio of any particle/cell property to its local average, based on a spherically symmetric, halo-centric radial profile. |
parent_subhalo_X |
Parent Subhalo [X] |
– |
Any property of the parent subhalo, per particle/cell. |
parent_halo_X |
Parent Halo [X] |
– |
Any property of the parent halo, per particle/cell. |