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Illustris

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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.
type	type	boolean
id	id	integer		Group index number
Group		float		FoF halos
BHMass	Group_BHMass	float	\(10^{10}M_\odot/h\)	Sum of the BH_Mass field of all blackholes (type 5) in this group.
\(\dot{M}_{\rm BH}\)	Group_BHMdot	float	\((10^{10}M_\odot/h)/(0.978Gyr/h)\)	Sum of the BH_Mdot field of all blackholes (type 5) in this group.
CM		float	ckpc/h	Center of mass of the group, computed as the sum of the mass weighted relative coordinates of all particles/cells in the group, of all types. Comoving coordinate. (Available only for the Illustris-3 run)
\({\rm CM}_x\)	Group_CM_x	float	ckpc/h
\({\rm CM}_y\)	Group_CM_y	float	ckpc/h
\({\rm CM}_z\)	Group_CM_z	float	ckpc/h
FirstSub	Group_FirstSub	integer		Index into the Subhalo table of the first/primary/most massive Subfind group within this FoF group. Note: This value is signed (or should be interpreted as signed)! In this case, a value of -1 indicates that this FoF group has no subhalos.
GasMetallicity	Group_GasMetallicity	float		Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all gas cells in this FOF group.
\(N_{\rm part}\)	Group_Len	integer		Integer counter of the total number of particles/cells of all types in this group.
LenType		integer		Integer counter of the total number of particles/cells, split into the six different types, in this group. Note: Wind phase cells are counted as stars (type 4) for GroupLenType.
\(N_{\rm gas}\)	Group_LenType_gas	integer
\(N_{\rm DM}\)	Group_LenType_dm	integer
unused	Group_LenType_unused	integer
tracers	Group_LenType_tracers	integer
\(N_{\rm stars}\)	Group_LenType_stars	integer
\(N_{\rm BH}\)	Group_LenType_bh	integer
\(M_{\rm tot}\)	Group_Mass	float	\(10^{10}M_\odot/h\)	Sum of the individual masses of every particle/cell, of all types, in this group.
MassType		float	\(10^{10}M_\odot/h\)	Sum of the individual masses of every particle/cell, split into the six different types, in this group. Note: Wind phase cells are counted as gas (type 0) for GroupMassType.
\(M_{\rm gas}\)	Group_MassType_gas	float	\(10^{10}M_\odot/h\)
\(M_{\rm DM}\)	Group_MassType_dm	float	\(10^{10}M_\odot/h\)
unused	Group_MassType_unused	float	\(10^{10}M_\odot/h\)
tracers	Group_MassType_tracers	float	\(10^{10}M_\odot/h\)
\(M_{\star}\)	Group_MassType_stars	float	\(10^{10}M_\odot/h\)
\(M_{\rm BH}\)	Group_MassType_bh	float	\(10^{10}M_\odot/h\)
Nsubs	Group_Nsubs	integer		Count of the total number of Subfind groups within this FoF group.
Pos		float	ckpc/h	Spatial position within the periodic box of the maximum bound particle. Comoving coordinate.
x	Group_Pos_x	float	ckpc/h
y	Group_Pos_y	float	ckpc/h
z	Group_Pos_z	float	ckpc/h
SFR	Group_SFR	float	\(M_\odot/yr\)	Sum of the individual star formation rates of all gas cells in this group.
StarMetallicity	Group_StarMetallicity	float		Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all star particles in this FOF group.
vel		float	km/s/a	Velocity of the group, computed as the sum of the mass weighted velocities of all particles/cells in this group, of all types. The peculiar velocity is obtained by multiplying this value by \(1/a.\)
\(v_x\)	Group_Vel_x	float	km/s/a
\(v_y\)	Group_Vel_y	float	km/s/a
\(v_z\)	Group_Vel_z	float	km/s/a
WindMass	Group_WindMass	float	\(10^{10}M_\odot/h\)	Sum of the individual masses of all wind phase gas cells (type 4, BirthTime <= 0) in this group.
M_Crit200	Group_M_Crit200	float	\(10^{10}M_\odot/h\)	Total Mass of this group enclosed in a sphere whose mean density is 200 times the critical density of the Universe, at the time the halo is considered.
M_Crit500	Group_M_Crit500	float	\(10^{10}M_\odot/h\)	Total Mass of this group enclosed in a sphere whose mean density is 500 times the critical density of the Universe, at the time the halo is considered.
M_Mean200	Group_M_Mean200	float	\(10^{10}M_\odot/h\)	Total Mass of this group enclosed in a sphere whose mean density is 200 times the mean density of the Universe, at the time the halo is considered.
M_TopHat200	Group_M_TopHat200	float	\(10^{10}M_\odot/h\)	Total Mass of this group enclosed in a sphere whose mean density is \(\Delta_c\) times the critical density of the Universe, at the time the halo is considered. \(\Delta_c\) derives from the solution of the collapse of a spherical top-hat perturbation (fitting formula from Bryan+ 1998, http://adsabs.harvard.edu/abs/1998ApJ...495...80B). The subscript 200 can be ignored.
R_Crit200	Group_R_Crit200	float	ckpc/h	Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is 200 times the critical density of the Universe, at the time the halo is considered.
R_Crit500	Group_R_Crit500	float	ckpc/h	Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is 500 times the critical density of the Universe, at the time the halo is considered.
R_Mean200	Group_R_Mean200	float	ckpc/h	Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is 200 times the mean density of the Universe, at the time the halo is considered.
R_TopHat200	Group_R_TopHat200	float	ckpc/h	Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is \(\Delta_c\) times the critical density of the Universe, at the time the halo is considered.
SnapByType		long
gas	Group_SnapByType_gas	long
dm	Group_SnapByType_dm	long
unused	Group_SnapByType_unused	long
tracers	Group_SnapByType_tracers	long
stars	Group_SnapByType_stars	long
bh	Group_SnapByType_bh	long
FuzzByType		long
gas	Group_FuzzByType_gas	long
dm	Group_FuzzByType_dm	long
unused	Group_FuzzByType_unused	long
tracers	Group_FuzzByType_tracers	long
stars	Group_FuzzByType_stars	long
bh	Group_FuzzByType_bh	long
Subhalo		float		Subfind Subhalos
id	Subhalo_id	integer		Subgroup index number
BHMass	Subhalo_BHMass	float	\(10^{10}M_\odot/h\)	Sum of the masses of all blackholes in this subhalo.
BHMdot	Subhalo_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	Subhalo_CM_x	float	ckpc/h
y	Subhalo_CM_y	float	ckpc/h
z	Subhalo_CM_z	float	ckpc/h
GasMetallicity	Subhalo_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	Subhalo_GasMetallicityHalfRad	float		Same as SubhaloGasMetallicity, but restricted to cells within the stellar half mass radius.
GasMetallicityMaxRad	Subhalo_GasMetallicityMaxRad	float		Same as SubhaloGasMetallicity, but restricted to cells within the radius of \(V_{max}\).
GasMetallicitySfr	Subhalo_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	Subhalo_GasMetallicitySfrWeighted	float		Same as SubhaloGasMetallicitySfr, but weighted by the cell star-formation rate rather than the cell mass.
GrNr	Subhalo_GrNr	integer		Index into the Group table of the FOF host/parent of this Subhalo.
HalfmassRad	Subhalo_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	Subhalo_HalfmassRadType_gas	float	ckpc/h
dm	Subhalo_HalfmassRadType_dm	float	ckpc/h
unused	Subhalo_HalfmassRadType_unused	float	ckpc/h
tracers	Subhalo_HalfmassRadType_tracers	float	ckpc/h
stars	Subhalo_HalfmassRadType_stars	float	ckpc/h
bh	Subhalo_HalfmassRadType_bh	float	ckpc/h
IDMostbound	Subhalo_IDMostbound	long		The ID of the particle with the smallest binding energy (could be any type).
Len	Subhalo_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	Subhalo_LenType_gas	integer
dm	Subhalo_LenType_dm	integer
unused	Subhalo_LenType_unused	integer
tracers	Subhalo_LenType_tracers	integer
stars	Subhalo_LenType_stars	integer
bh	Subhalo_LenType_bh	integer
Mass	Subhalo_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	Subhalo_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	Subhalo_MassInHalfRadType_gas	float	\(10^{10}M_\odot/h\)
dm	Subhalo_MassInHalfRadType_dm	float	\(10^{10}M_\odot/h\)
unused	Subhalo_MassInHalfRadType_unused	float	\(10^{10}M_\odot/h\)
tracers	Subhalo_MassInHalfRadType_tracers	float	\(10^{10}M_\odot/h\)
stars	Subhalo_MassInHalfRadType_stars	float	\(10^{10}M_\odot/h\)
bh	Subhalo_MassInHalfRadType_bh	float	\(10^{10}M_\odot/h\)
MassInMaxRad	Subhalo_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	Subhalo_MassInMaxRadType_gas	float	\(10^{10}M_\odot/h\)
dm	Subhalo_MassInMaxRadType_dm	float	\(10^{10}M_\odot/h\)
unused	Subhalo_MassInMaxRadType_unused	float	\(10^{10}M_\odot/h\)
tracers	Subhalo_MassInMaxRadType_tracers	float	\(10^{10}M_\odot/h\)
stars	Subhalo_MassInMaxRadType_stars	float	\(10^{10}M_\odot/h\)
bh	Subhalo_MassInMaxRadType_bh	float	\(10^{10}M_\odot/h\)
MassInRad	Subhalo_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	Subhalo_MassInRadType_gas	float	\(10^{10}M_\odot/h\)
dm	Subhalo_MassInRadType_dm	float	\(10^{10}M_\odot/h\)
unused	Subhalo_MassInRadType_unused	float	\(10^{10}M_\odot/h\)
tracers	Subhalo_MassInRadType_tracers	float	\(10^{10}M_\odot/h\)
stars	Subhalo_MassInRadType_stars	float	\(10^{10}M_\odot/h\)
bh	Subhalo_MassInRadType_bh	float	\(10^{10}M_\odot/h\)
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	Subhalo_MassType_gas	float	\(10^{10}M_\odot/h\)
dm	Subhalo_MassType_dm	float	\(10^{10}M_\odot/h\)
unused	Subhalo_MassType_unused	float	\(10^{10}M_\odot/h\)
tracers	Subhalo_MassType_tracers	float	\(10^{10}M_\odot/h\)
stars	Subhalo_MassType_stars	float	\(10^{10}M_\odot/h\)
bh	Subhalo_MassType_bh	float	\(10^{10}M_\odot/h\)
Parent	Subhalo_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	Subhalo_Pos_x	float	ckpc/h
y	Subhalo_Pos_y	float	ckpc/h
z	Subhalo_Pos_z	float	ckpc/h
SFR	Subhalo_SFR	float	\(M_\odot/yr\)	Sum of the individual star formation rates of all gas cells in this subhalo.
SFRinHalfRad	Subhalo_SFRinHalfRad	float	\(M_\odot/yr\)	Same as SubhaloSFR, but restricted to cells within the stellar half mass radius.
SFRinMaxRad	Subhalo_SFRinMaxRad	float	\(M_\odot/yr\)	Same as SubhaloSFR, but restricted to cells within the radius of \(V_{max}\).
SFRinRad	Subhalo_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	Subhalo_Spin_x	float	\((kpc/h)(km/s)\)
y	Subhalo_Spin_y	float	\((kpc/h)(km/s)\)
z	Subhalo_Spin_z	float	\((kpc/h)(km/s)\)
StarMetallicity	Subhalo_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	Subhalo_StarMetallicityHalfRad	float		Same as SubhaloStarMetallicity, but restricted to stars within the stellar half mass radius.
StarMetallicityMaxRad	Subhalo_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	Subhalo_StellarPhotometrics_U	float	mag
B	Subhalo_StellarPhotometrics_B	float	mag
V	Subhalo_StellarPhotometrics_V	float	mag
K	Subhalo_StellarPhotometrics_K	float	mag
g	Subhalo_StellarPhotometrics_g	float	mag
r	Subhalo_StellarPhotometrics_r	float	mag
i	Subhalo_StellarPhotometrics_i	float	mag
z	Subhalo_StellarPhotometrics_z	float	mag
StellarPhotometricsMassInRad	Subhalo_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	Subhalo_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	Subhalo_Vel_x	float	km/s
y	Subhalo_Vel_y	float	km/s
z	Subhalo_Vel_z	float	km/s
VelDisp	Subhalo_VelDisp	float	km/s	One-dimensional velocity dispersion of all the member particles/cells (the 3D dispersion divided by \(\sqrt{3}\)).
Vmax	Subhalo_Vmax	float	km/s	Maximum value of the spherically-averaged rotation curve.
VmaxRad	Subhalo_VmaxRad	float	kpc/h	Comoving radius of rotation curve maximum (where \(V_{max}\) is achieved).
WindMass	Subhalo_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	Subhalo_SnapByType_gas	long
dm	Subhalo_SnapByType_dm	long
unused	Subhalo_SnapByType_unused	long
tracers	Subhalo_SnapByType_tracers	long
stars	Subhalo_SnapByType_stars	long
bh	Subhalo_SnapByType_bh	long
HalfMassProjRad_DM	Subhalo_HalfMassProjRad_DM	float	pkpc	Projected physical radius enclosing half of the dark matter mass (averaged over three orthogonal projections).
Gas_Spin		float	pkpc km s-1	Total angular momentum per unit mass of all gas relative to the CentreOfMass.
x	Subhalo_Gas_Spin_x	float	pkpc km s-1
y	Subhalo_Gas_Spin_y	float	pkpc km s-1
z	Subhalo_Gas_Spin_z	float	pkpc km s-1
HalfMassProjRad		float	pkpc	Projected physical radius enclosing half of the mass (averaged over three orthogonal projections).
BH	Subhalo_HalfMassProjRad_BH	float	pkpc	Projected physical radius enclosing half of the black hole mass (averaged over three orthogonal projections). This is constructed from the particle masses and not from the subgrid masses.
Gas	Subhalo_HalfMassProjRad_Gas	float	pkpc	Projected physical radius enclosing half of the gas mass (averaged over three orthogonal projections).
Star	Subhalo_HalfMassProjRad_Star	float	pkpc	Projected physical radius enclosing half of the stellar mass (averaged over three orthogonal projections).
InitialMassWeightedBirthZ	Subhalo_InitialMassWeightedBirthZ	float	z	Mean redshift of formation of stars, weighted by birth mass.
InitialMassWeightedStellarAge	Subhalo_InitialMassWeightedStellarAge	float	Gyr	Mean age of stars, weighted by birth mass.
Stars_Spin		float	pkpc km s-1	Total angular momentum per unit mass relative to the CentreOfMass.
x	Subhalo_Stars_Spin_x	float	pkpc km s-1
y	Subhalo_Stars_Spin_y	float	pkpc km s-1
z	Subhalo_Stars_Spin_z	float	pkpc km s-1
StellarInitialMass	Subhalo_StellarInitialMass	float	Msun	Sum of birth masses of all stars.
StellarVelDisp	Subhalo_StellarVelDisp	float	km s-1	Average one dimensional velocity dispersion of stars.
ThermalEnergy	Subhalo_ThermalEnergy	float	Msun (km/s)2	Total thermal energy of the gas particles.
Aperture		float		Measurements within a given aperture from the center of potential, available aperture sizes are: 1, 3, 5, 10, 20, 30, 40, 50, 70 and 100 pkpc.
Mass_BH		float	Msun	Total (particle) mass of all black holes within the aperture.
1	Subhalo_Aperture_Mass_BH_1	float	Msun
3	Subhalo_Aperture_Mass_BH_3	float	Msun
5	Subhalo_Aperture_Mass_BH_5	float	Msun
10	Subhalo_Aperture_Mass_BH_10	float	Msun
20	Subhalo_Aperture_Mass_BH_20	float	Msun
30	Subhalo_Aperture_Mass_BH_30	float	Msun
40	Subhalo_Aperture_Mass_BH_40	float	Msun
50	Subhalo_Aperture_Mass_BH_50	float	Msun
70	Subhalo_Aperture_Mass_BH_70	float	Msun
100	Subhalo_Aperture_Mass_BH_100	float	Msun
Mass_DM		float	Msun	Total dark matter mass within the aperture.
1	Subhalo_Aperture_Mass_DM_1	float	Msun
3	Subhalo_Aperture_Mass_DM_3	float	Msun
5	Subhalo_Aperture_Mass_DM_5	float	Msun
10	Subhalo_Aperture_Mass_DM_10	float	Msun
20	Subhalo_Aperture_Mass_DM_20	float	Msun
30	Subhalo_Aperture_Mass_DM_30	float	Msun
40	Subhalo_Aperture_Mass_DM_40	float	Msun
50	Subhalo_Aperture_Mass_DM_50	float	Msun
70	Subhalo_Aperture_Mass_DM_70	float	Msun
100	Subhalo_Aperture_Mass_DM_100	float	Msun
Mass_Gas		float	Msun	Total gas mass within the aperture.
1	Subhalo_Aperture_Mass_Gas_1	float	Msun
3	Subhalo_Aperture_Mass_Gas_3	float	Msun
5	Subhalo_Aperture_Mass_Gas_5	float	Msun
10	Subhalo_Aperture_Mass_Gas_10	float	Msun
20	Subhalo_Aperture_Mass_Gas_20	float	Msun
30	Subhalo_Aperture_Mass_Gas_30	float	Msun
40	Subhalo_Aperture_Mass_Gas_40	float	Msun
50	Subhalo_Aperture_Mass_Gas_50	float	Msun
70	Subhalo_Aperture_Mass_Gas_70	float	Msun
100	Subhalo_Aperture_Mass_Gas_100	float	Msun
Mass_Star		float	Msun	Total stellar mass within the aperture.
1	Subhalo_Aperture_Mass_Star_1	float	Msun
3	Subhalo_Aperture_Mass_Star_3	float	Msun
5	Subhalo_Aperture_Mass_Star_5	float	Msun
10	Subhalo_Aperture_Mass_Star_10	float	Msun
20	Subhalo_Aperture_Mass_Star_20	float	Msun
30	Subhalo_Aperture_Mass_Star_30	float	Msun
40	Subhalo_Aperture_Mass_Star_40	float	Msun
50	Subhalo_Aperture_Mass_Star_50	float	Msun
70	Subhalo_Aperture_Mass_Star_70	float	Msun
100	Subhalo_Aperture_Mass_Star_100	float	Msun
SFR		float	yr-1	Star formation rate within the aperture.
1	Subhalo_Aperture_SFR_1	float	yr-1
3	Subhalo_Aperture_SFR_3	float	yr-1
5	Subhalo_Aperture_SFR_5	float	yr-1
10	Subhalo_Aperture_SFR_10	float	yr-1
20	Subhalo_Aperture_SFR_20	float	yr-1
30	Subhalo_Aperture_SFR_30	float	yr-1
40	Subhalo_Aperture_SFR_40	float	yr-1
50	Subhalo_Aperture_SFR_50	float	yr-1
70	Subhalo_Aperture_SFR_70	float	yr-1
100	Subhalo_Aperture_SFR_100	float	yr-1
VelDisp		float	km s-1	Stellar velocity dispersion within the aperture, with respect to the centre of mass of the galaxy.
1	Subhalo_Aperture_VelDisp_1	float	km s-1
3	Subhalo_Aperture_VelDisp_3	float	km s-1
5	Subhalo_Aperture_VelDisp_5	float	km s-1
10	Subhalo_Aperture_VelDisp_10	float	km s-1
20	Subhalo_Aperture_VelDisp_20	float	km s-1
30	Subhalo_Aperture_VelDisp_30	float	km s-1
40	Subhalo_Aperture_VelDisp_40	float	km s-1
50	Subhalo_Aperture_VelDisp_50	float	km s-1
70	Subhalo_Aperture_VelDisp_70	float	km s-1
100	Subhalo_Aperture_VelDisp_100	float	km s-1
Sizes		float
R_halfmass100	Subhalo_Sizes_R_halfmass100	float	pkpc	Half mass radius computed for mass within a spherical 100 pkpc aperture.
R_halfmass100_projected	Subhalo_Sizes_R_halfmass100_projected	float	pkpc	Projected half mass radius computed for mass within a 100 pkpc aperture (averaged over three orthogonal projections).
R_halfmass30	Subhalo_Sizes_R_halfmass30	float	pkpc	Half mass radius computed for mass within a spherical 30 pkpc aperture.
R_halfmass30_projected	Subhalo_Sizes_R_halfmass30_projected	float	pkpc	Projected half mass radius computed for mass within a 30 pkpc aperture (averaged over three orthogonal projections).

About Catalog

Illustris FoF Halo catalog derived with a standard friends-of-friends (FoF) algorithm. Any publication using these data should cite Vogelsberger+ (2014) and Nelson+ (2015).

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Group FoF halos																																																			Subhalo Subfind Subhalos
BHMass \(10^{10}M_\odot/h\) Sum of the BH_Mass field of all blackholes (type 5) in this group.	\(\dot{M}_{\rm BH}\) \((10^{10}M_\odot/h)/(0.978Gyr/h)\) Sum of the BH_Mdot field of all blackholes (type 5) in this group.	CM ckpc/h Center of mass of the group, computed as the sum of the mass weighted relative coordinates of all particles/cells in the group, of all types. Comoving coordinate. (Available only for the Illustris-3 run)			FirstSub Index into the Subhalo table of the first/primary/most massive Subfind group within this FoF group. Note: This value is signed (or should be interpreted as signed)! In this case, a value of -1 indicates that this FoF group has no subhalos.	GasMetallicity Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all gas cells in this FOF group.	\(N_{\rm part}\) Integer counter of the total number of particles/cells of all types in this group.	LenType Integer counter of the total number of particles/cells, split into the six different types, in this group. Note: Wind phase cells are counted as stars (type 4) for GroupLenType.						\(M_{\rm tot}\) \(10^{10}M_\odot/h\) Sum of the individual masses of every particle/cell, of all types, in this group.	MassType \(10^{10}M_\odot/h\) Sum of the individual masses of every particle/cell, split into the six different types, in this group. Note: Wind phase cells are counted as gas (type 0) for GroupMassType.						Nsubs Count of the total number of Subfind groups within this FoF group.	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 group.	StarMetallicity Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all star particles in this FOF group.	vel km/s/a Velocity of the group, computed as the sum of the mass weighted velocities of all particles/cells in this group, of all types. The peculiar velocity is obtained by multiplying this value by \(1/a.\)			WindMass \(10^{10}M_\odot/h\) Sum of the individual masses of all wind phase gas cells (type 4, BirthTime <= 0) in this group.	M_Crit200 \(10^{10}M_\odot/h\) Total Mass of this group enclosed in a sphere whose mean density is 200 times the critical density of the Universe, at the time the halo is considered.	M_Crit500 \(10^{10}M_\odot/h\) Total Mass of this group enclosed in a sphere whose mean density is 500 times the critical density of the Universe, at the time the halo is considered.	M_Mean200 \(10^{10}M_\odot/h\) Total Mass of this group enclosed in a sphere whose mean density is 200 times the mean density of the Universe, at the time the halo is considered.	M_TopHat200 \(10^{10}M_\odot/h\) Total Mass of this group enclosed in a sphere whose mean density is \(\Delta_c\) times the critical density of the Universe, at the time the halo is considered. \(\Delta_c\) derives from the solution of the collapse of a spherical top-hat perturbation (fitting formula from Bryan+ 1998, http://adsabs.harvard.edu/abs/1998ApJ...495...80B). The subscript 200 can be ignored.	R_Crit200 ckpc/h Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is 200 times the critical density of the Universe, at the time the halo is considered.	R_Crit500 ckpc/h Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is 500 times the critical density of the Universe, at the time the halo is considered.	R_Mean200 ckpc/h Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is 200 times the mean density of the Universe, at the time the halo is considered.	R_TopHat200 ckpc/h Comoving Radius of a sphere centered at the GroupPos of this Group whose mean density is \(\Delta_c\) times the critical density of the Universe, at the time the halo is considered.	SnapByType						FuzzByType						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						HalfMassProjRad_DM pkpc Projected physical radius enclosing half of the dark matter mass (averaged over three orthogonal projections).	Gas_Spin pkpc km s-1 Total angular momentum per unit mass of all gas relative to the CentreOfMass.			HalfMassProjRad pkpc Projected physical radius enclosing half of the mass (averaged over three orthogonal projections).			InitialMassWeightedBirthZ z Mean redshift of formation of stars, weighted by birth mass.	InitialMassWeightedStellarAge Gyr Mean age of stars, weighted by birth mass.	Stars_Spin pkpc km s-1 Total angular momentum per unit mass relative to the CentreOfMass.			StellarInitialMass Msun Sum of birth masses of all stars.	StellarVelDisp km s-1 Average one dimensional velocity dispersion of stars.	ThermalEnergy Msun (km/s)2 Total thermal energy of the gas particles.	Aperture Measurements within a given aperture from the center of potential, available aperture sizes are: 1, 3, 5, 10, 20, 30, 40, 50, 70 and 100 pkpc.																																																												Sizes
		\({\rm CM}_x\) ckpc/h	\({\rm CM}_y\) ckpc/h	\({\rm CM}_z\) ckpc/h				\(N_{\rm gas}\)	\(N_{\rm DM}\)	unused	tracers	\(N_{\rm stars}\)	\(N_{\rm BH}\)		\(M_{\rm gas}\) \(10^{10}M_\odot/h\)	\(M_{\rm DM}\) \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	\(M_{\star}\) \(10^{10}M_\odot/h\)	\(M_{\rm BH}\) \(10^{10}M_\odot/h\)		x ckpc/h	y ckpc/h	z ckpc/h			\(v_x\) km/s/a	\(v_y\) km/s/a	\(v_z\) km/s/a										gas	dm	unused	tracers	stars	bh	gas	dm	unused	tracers	stars	bh				x ckpc/h	y ckpc/h	z ckpc/h								gas ckpc/h	dm ckpc/h	unused ckpc/h	tracers ckpc/h	stars ckpc/h	bh ckpc/h			gas	dm	unused	tracers	stars	bh			gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)		gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)		gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)	gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)		x ckpc/h	y ckpc/h	z ckpc/h					x \((kpc/h)(km/s)\)	y \((kpc/h)(km/s)\)	z \((kpc/h)(km/s)\)				U mag	B mag	V mag	K mag	g mag	r mag	i mag	z mag			x km/s	y km/s	z km/s					gas	dm	unused	tracers	stars	bh		x pkpc km s-1	y pkpc km s-1	z pkpc km s-1	BH pkpc Projected physical radius enclosing half of the black hole mass (averaged over three orthogonal projections). This is constructed from the particle masses and not from the subgrid masses.	Gas pkpc Projected physical radius enclosing half of the gas mass (averaged over three orthogonal projections).	Star pkpc Projected physical radius enclosing half of the stellar mass (averaged over three orthogonal projections).			x pkpc km s-1	y pkpc km s-1	z pkpc km s-1				Mass_BH Msun Total (particle) mass of all black holes within the aperture.										Mass_DM Msun Total dark matter mass within the aperture.										Mass_Gas Msun Total gas mass within the aperture.										Mass_Star Msun Total stellar mass within the aperture.										SFR yr-1 Star formation rate within the aperture.										VelDisp km s-1 Stellar velocity dispersion within the aperture, with respect to the centre of mass of the galaxy.										R_halfmass100 pkpc Half mass radius computed for mass within a spherical 100 pkpc aperture.	R_halfmass100_projected pkpc Projected half mass radius computed for mass within a 100 pkpc aperture (averaged over three orthogonal projections).	R_halfmass30 pkpc Half mass radius computed for mass within a spherical 30 pkpc aperture.	R_halfmass30_projected pkpc Projected half mass radius computed for mass within a 30 pkpc aperture (averaged over three orthogonal projections).
		\({\rm CM}_x\) ckpc/h	\({\rm CM}_y\) ckpc/h	\({\rm CM}_z\) ckpc/h				\(N_{\rm gas}\)	\(N_{\rm DM}\)	unused	tracers	\(N_{\rm stars}\)	\(N_{\rm BH}\)		\(M_{\rm gas}\) \(10^{10}M_\odot/h\)	\(M_{\rm DM}\) \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	\(M_{\star}\) \(10^{10}M_\odot/h\)	\(M_{\rm BH}\) \(10^{10}M_\odot/h\)		x ckpc/h	y ckpc/h	z ckpc/h			\(v_x\) km/s/a	\(v_y\) km/s/a	\(v_z\) km/s/a										gas	dm	unused	tracers	stars	bh	gas	dm	unused	tracers	stars	bh				x ckpc/h	y ckpc/h	z ckpc/h								gas ckpc/h	dm ckpc/h	unused ckpc/h	tracers ckpc/h	stars ckpc/h	bh ckpc/h			gas	dm	unused	tracers	stars	bh			gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)		gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)		gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)	gas \(10^{10}M_\odot/h\)	dm \(10^{10}M_\odot/h\)	unused \(10^{10}M_\odot/h\)	tracers \(10^{10}M_\odot/h\)	stars \(10^{10}M_\odot/h\)	bh \(10^{10}M_\odot/h\)		x ckpc/h	y ckpc/h	z ckpc/h					x \((kpc/h)(km/s)\)	y \((kpc/h)(km/s)\)	z \((kpc/h)(km/s)\)				U mag	B mag	V mag	K mag	g mag	r mag	i mag	z mag			x km/s	y km/s	z km/s					gas	dm	unused	tracers	stars	bh		x pkpc km s-1	y pkpc km s-1	z pkpc km s-1						x pkpc km s-1	y pkpc km s-1	z pkpc km s-1				1 Msun	3 Msun	5 Msun	10 Msun	20 Msun	30 Msun	40 Msun	50 Msun	70 Msun	100 Msun	1 Msun	3 Msun	5 Msun	10 Msun	20 Msun	30 Msun	40 Msun	50 Msun	70 Msun	100 Msun	1 Msun	3 Msun	5 Msun	10 Msun	20 Msun	30 Msun	40 Msun	50 Msun	70 Msun	100 Msun	1 Msun	3 Msun	5 Msun	10 Msun	20 Msun	30 Msun	40 Msun	50 Msun	70 Msun	100 Msun	1 yr-1	3 yr-1	5 yr-1	10 yr-1	20 yr-1	30 yr-1	40 yr-1	50 yr-1	70 yr-1	100 yr-1	1 km s-1	3 km s-1	5 km s-1	10 km s-1	20 km s-1	30 km s-1	40 km s-1	50 km s-1	70 km s-1	100 km s-1

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