Illustris Subfind Subhalos
Plot type: Histogram bins the data by a single field and displays count of objects per bin. Heatmap bins the data by two fields and displays count as color. Conditional distribution bins the data by one field and displays the distribution of a second field within that bin as a boxplot (range and quartiles). Shows a scatterplot of a (random subset) of actual data points.
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For log functionality, set the filter to enable only positive values.
For log functionality, set the filter to enable only positive values.
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Example python code to apply the above filters and retrieve data. To use, download and install this module .


Fields Dictionary
Field Variable Type Units Description
simulation simulation byte e.g. 'Illustris-1' or 'Illustris-2-Dark'.
snap snapshot short snapshot number
time time float Scalefactor of the snapshot corresponding to this group catalog.
z redshift float Redshift of the snapshot corresponding to this group catalog.
id id integer Subgroup index number
BHMass BHMass float \(10^{10}M_\odot/h\) Sum of the masses of all blackholes in this subhalo.
BHMdot BHMdot float \((10^{10}M_\odot/h)/(0.978Gyr/h)\) Sum of the instantaneous accretion rates \(\dot{M}\) of all blackholes in this subhalo.
CM float ckpc/h Comoving center of mass of the Subhalo, computed as the sum of the mass weighted relative coordinates of all particles/cells in the Subhalo, of all types.
x CM_x float
y CM_y float
z CM_z float
GasMetallicity GasMetallicity float Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the gas cells bound to this Subhalo, but restricted to cells within twice the stellar half mass radius.
GasMetallicityHalfRad GasMetallicityHalfRad float Same as SubhaloGasMetallicity, but restricted to cells within the stellar half mass radius.
GasMetallicityMaxRad GasMetallicityMaxRad float Same as SubhaloGasMetallicity, but restricted to cells within the radius of \(V_{max}\).
GasMetallicitySfr GasMetallicitySfr float Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the gas cells bound to this Subhalo, but restricted to cells which are star forming.
GasMetallicitySfrWeighted GasMetallicitySfrWeighted float Same as SubhaloGasMetallicitySfr, but weighted by the cell star-formation rate rather than the cell mass.
GrNr GrNr integer Index into the Group table of the FOF host/parent of this Subhalo.
HalfmassRad HalfmassRad float ckpc/h Comoving radius containing half of the total mass (SubhaloMass) of this Subhalo.
HalfmassRadType float ckpc/h Comoving radius containing half of the mass of this Subhalo split by Type (SubhaloMassType).
gas HalfmassRadType_gas float
dm HalfmassRadType_dm float
unused HalfmassRadType_unused float
tracers HalfmassRadType_tracers float
stars HalfmassRadType_stars float
bh HalfmassRadType_bh float
IDMostbound IDMostbound long The ID of the particle with the smallest binding energy (could be any type).
Len Len integer Total number of member particle/cells in this Subhalo, of all types.
LenType integer Total number of member particle/cells in this Subhalo, separated by type.
gas LenType_gas integer
dm LenType_dm integer
unused LenType_unused integer
tracers LenType_tracers integer
stars LenType_stars integer
bh LenType_bh integer
Mass Mass float \(10^{10}M_\odot/h\) Total mass of all member particle/cells which are bound to this Subhalo, of all types. Particle/cells bound to subhaloes of this Subhalo are NOT accounted for.
MassInHalfRad MassInHalfRad float \(10^{10}M_\odot/h\) Sum of masses of all particles/cells within the stellar half mass radius.
MassInHalfRadType float \(10^{10}M_\odot/h\) Sum of masses of all particles/cells (split by type) within the stellar half mass radius.
gas MassInHalfRadType_gas float
dm MassInHalfRadType_dm float
unused MassInHalfRadType_unused float
tracers MassInHalfRadType_tracers float
stars MassInHalfRadType_stars float
bh MassInHalfRadType_bh float
MassInMaxRad MassInMaxRad float \(10^{10}M_\odot/h\) Sum of masses of all particles/cells within the radius of \(V_{max}\).
MassInMaxRadType float \(10^{10}M_\odot/h\) Sum of masses of all particles/cells (split by type) within the radius of \(V_{max}\).
gas MassInMaxRadType_gas float
dm MassInMaxRadType_dm float
unused MassInMaxRadType_unused float
tracers MassInMaxRadType_tracers float
stars MassInMaxRadType_stars float
bh MassInMaxRadType_bh float
MassInRad MassInRad float \(10^{10}M_\odot/h\) Sum of masses of all particles/cells within twice the stellar half mass radius.
MassInRadType float \(10^{10}M_\odot/h\) Sum of masses of all particles/cells (split by type) within twice the stellar half mass radius.
gas MassInRadType_gas float
dm MassInRadType_dm float
unused MassInRadType_unused float
tracers MassInRadType_tracers float
stars MassInRadType_stars float
bh MassInRadType_bh float
MassType float \(10^{10}M_\odot/h\) Total mass of all member particle/cells which are bound to this Subhalo, separated by type. Particle/cells bound to subhaloes of this Subhalo are NOT accounted for. Note: Wind phase cells are counted as gas (type 0) for SubhaloMassType.
gas MassType_gas float
dm MassType_dm float
unused MassType_unused float
tracers MassType_tracers float
stars MassType_stars float
bh MassType_bh float
Parent Parent integer Index into the Subhalo table of the unique SUBF host/parent of this Subhalo. This index is local to the group (i.e. 2 indicates the third most massive subhalo of the parent halo of this subhalo, not the third most massive of the whole snapshot). The values are often zero for all subhalos of a group, indicating that there is no resolved hierarchical structure in that group, beyond the primary subhalo having as direct children all of the secondary subhalos.
Pos float ckpc/h Spatial position within the periodic box of the maximum bound particle. Comoving coordinate.
x Pos_x float
y Pos_y float
z Pos_z float
SFR SFR float \(M_\odot/yr\) Sum of the individual star formation rates of all gas cells in this subhalo.
SFRinHalfRad SFRinHalfRad float \(M_\odot/yr\) Same as SubhaloSFR, but restricted to cells within the stellar half mass radius.
SFRinMaxRad SFRinMaxRad float \(M_\odot/yr\) Same as SubhaloSFR, but restricted to cells within the radius of \(V_{max}\).
SFRinRad SFRinRad float \(M_\odot/yr\) Same as SubhaloSFR, but restricted to cells within twice the stellar half mass radius.
Spin float \((kpc/h)(km/s)\) Total spin per axis, computed for each as the mass weighted sum of the relative coordinate times relative velocity of all member particles/cells.
x Spin_x float
y Spin_y float
z Spin_z float
StarMetallicity StarMetallicity float - Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the star particles bound to this Subhalo, but restricted to stars within twice the stellar half mass radius.
StarMetallicityHalfRad StarMetallicityHalfRad float Same as SubhaloStarMetallicity, but restricted to stars within the stellar half mass radius.
StarMetallicityMaxRad StarMetallicityMaxRad float - Same as SubhaloStarMetallicity, but restricted to stars within the radius of \(V_{max}\).
StellarPhotometrics float mag Eight bands: U, B, V, K, g, r, i, z. Magnitudes based on the summed-up luminosities of all the stellar particles of the group. For details on the bands, see snapshot table for stars.
U StellarPhotometrics_U float
B StellarPhotometrics_B float
V StellarPhotometrics_V float
K StellarPhotometrics_K float
g StellarPhotometrics_g float
r StellarPhotometrics_r float
i StellarPhotometrics_i float
z StellarPhotometrics_z float
StellarPhotometricsMassInRad StellarPhotometricsMassInRad float \(10^{10}M_\odot/h\) Sum of the mass of the member stellar particles, but restricted to stars within the radius SubhaloStellarPhotometricsRad.
StellarPhotometricsRad StellarPhotometricsRad float ckpc/h Radius at which the surface brightness profile (computed from all member stellar particles) drops below the limit of 20.7 mag arcsec\(^{-2}\) in the K band (in comoving units).
Vel float km/s Peculiar velocity of the group, computed as the sum of the mass weighted velocities of all particles/cells in this group, of all types. No unit conversion is needed.
x Vel_x float
y Vel_y float
z Vel_z float
VelDisp VelDisp float km/s One-dimensional velocity dispersion of all the member particles/cells (the 3D dispersion divided by \(\sqrt{3}\)).
Vmax Vmax float km/s Maximum value of the spherically-averaged rotation curve.
VmaxRad VmaxRad float kpc/h Comoving radius of rotation curve maximum (where \(V_{max}\) is achieved).
WindMass WindMass float \(10^{10}M_\odot/h\) Sum of masses of all wind-phase cells in this subhalo (with Type==4 and BirthTime<=0).
SnapByType long
gas SnapByType_gas long
dm SnapByType_dm long
unused SnapByType_unused long
tracers SnapByType_tracers long
stars SnapByType_stars long
bh SnapByType_bh long
About Catalog

Illustris Subfind Subhalo catalog derived with the Subfind algorithm. Any publication using these data should cite Vogelsberger+ (2014) and Nelson+ (2015).

Active Filters

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Format

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Raw Data
simulation e.g. 'Illustris-1' or 'Illustris-2-Dark'. snap snapshot number time Scalefactor of the snapshot corresponding to this group catalog. z Redshift of the snapshot corresponding to this group catalog. id Subgroup index number BHMass
\(10^{10}M_\odot/h\) Sum of the masses of all blackholes in this subhalo.
BHMdot
\((10^{10}M_\odot/h)/(0.978Gyr/h)\) Sum of the instantaneous accretion rates \(\dot{M}\) of all blackholes in this subhalo.
CM ckpc/h Comoving center of mass of the Subhalo, computed as the sum of the mass weighted relative coordinates of all particles/cells in the Subhalo, of all types. GasMetallicity Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the gas cells bound to this Subhalo, but restricted to cells within twice the stellar half mass radius. GasMetallicityHalfRad Same as SubhaloGasMetallicity, but restricted to cells within the stellar half mass radius. GasMetallicityMaxRad Same as SubhaloGasMetallicity, but restricted to cells within the radius of \(V_{max}\). GasMetallicitySfr Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the gas cells bound to this Subhalo, but restricted to cells which are star forming. GasMetallicitySfrWeighted Same as SubhaloGasMetallicitySfr, but weighted by the cell star-formation rate rather than the cell mass. GrNr Index into the Group table of the FOF host/parent of this Subhalo. HalfmassRad
ckpc/h Comoving radius containing half of the total mass (SubhaloMass) of this Subhalo.
HalfmassRadType ckpc/h Comoving radius containing half of the mass of this Subhalo split by Type (SubhaloMassType). IDMostbound The ID of the particle with the smallest binding energy (could be any type). Len Total number of member particle/cells in this Subhalo, of all types. LenType Total number of member particle/cells in this Subhalo, separated by type. Mass
\(10^{10}M_\odot/h\) Total mass of all member particle/cells which are bound to this Subhalo, of all types. Particle/cells bound to subhaloes of this Subhalo are NOT accounted for.
MassInHalfRad
\(10^{10}M_\odot/h\) Sum of masses of all particles/cells within the stellar half mass radius.
MassInHalfRadType \(10^{10}M_\odot/h\) Sum of masses of all particles/cells (split by type) within the stellar half mass radius. MassInMaxRad
\(10^{10}M_\odot/h\) Sum of masses of all particles/cells within the radius of \(V_{max}\).
MassInMaxRadType \(10^{10}M_\odot/h\) Sum of masses of all particles/cells (split by type) within the radius of \(V_{max}\). MassInRad
\(10^{10}M_\odot/h\) Sum of masses of all particles/cells within twice the stellar half mass radius.
MassInRadType \(10^{10}M_\odot/h\) Sum of masses of all particles/cells (split by type) within twice the stellar half mass radius. MassType \(10^{10}M_\odot/h\) Total mass of all member particle/cells which are bound to this Subhalo, separated by type. Particle/cells bound to subhaloes of this Subhalo are NOT accounted for. Note: Wind phase cells are counted as gas (type 0) for SubhaloMassType. Parent Index into the Subhalo table of the unique SUBF host/parent of this Subhalo. This index is local to the group (i.e. 2 indicates the third most massive subhalo of the parent halo of this subhalo, not the third most massive of the whole snapshot). The values are often zero for all subhalos of a group, indicating that there is no resolved hierarchical structure in that group, beyond the primary subhalo having as direct children all of the secondary subhalos. Pos ckpc/h Spatial position within the periodic box of the maximum bound particle. Comoving coordinate. SFR
\(M_\odot/yr\) Sum of the individual star formation rates of all gas cells in this subhalo.
SFRinHalfRad
\(M_\odot/yr\) Same as SubhaloSFR, but restricted to cells within the stellar half mass radius.
SFRinMaxRad
\(M_\odot/yr\) Same as SubhaloSFR, but restricted to cells within the radius of \(V_{max}\).
SFRinRad
\(M_\odot/yr\) Same as SubhaloSFR, but restricted to cells within twice the stellar half mass radius.
Spin \((kpc/h)(km/s)\) Total spin per axis, computed for each as the mass weighted sum of the relative coordinate times relative velocity of all member particles/cells. StarMetallicity
- Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the star particles bound to this Subhalo, but restricted to stars within twice the stellar half mass radius.
StarMetallicityHalfRad Same as SubhaloStarMetallicity, but restricted to stars within the stellar half mass radius. StarMetallicityMaxRad
- Same as SubhaloStarMetallicity, but restricted to stars within the radius of \(V_{max}\).
StellarPhotometrics mag Eight bands: U, B, V, K, g, r, i, z. Magnitudes based on the summed-up luminosities of all the stellar particles of the group. For details on the bands, see snapshot table for stars. StellarPhotometricsMassInRad
\(10^{10}M_\odot/h\) Sum of the mass of the member stellar particles, but restricted to stars within the radius SubhaloStellarPhotometricsRad.
StellarPhotometricsRad
ckpc/h Radius at which the surface brightness profile (computed from all member stellar particles) drops below the limit of 20.7 mag arcsec\(^{-2}\) in the K band (in comoving units).
Vel km/s Peculiar velocity of the group, computed as the sum of the mass weighted velocities of all particles/cells in this group, of all types. No unit conversion is needed. VelDisp
km/s One-dimensional velocity dispersion of all the member particles/cells (the 3D dispersion divided by \(\sqrt{3}\)).
Vmax
km/s Maximum value of the spherically-averaged rotation curve.
VmaxRad
kpc/h Comoving radius of rotation curve maximum (where \(V_{max}\) is achieved).
WindMass
\(10^{10}M_\odot/h\) Sum of masses of all wind-phase cells in this subhalo (with Type==4 and BirthTime<=0).
SnapByType
x y z gas dm unused tracers stars bh gas dm unused tracers stars bh gas dm unused tracers stars bh gas dm unused tracers stars bh gas dm unused tracers stars bh gas dm unused tracers stars bh x y z x y z U B V K g r i z x y z gas dm unused tracers stars bh