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Fields Dictionary

Field	Variable	Type	Units	Description
simulation_suite	simulation_suite	byte		e.g. 'IllustrisTNG' or 'SIMBA'.
simulation_set	simulation_set	byte		e.g. 'LH', '1P', 'CV' or 'EX'.
simulation_set_id	simulation_set_id	short		Integer ID of the simulation set. E.g. for IllustrisTNG LH 12, this value is '12'.
params		float		Simulation parameter:
Omega_m	params_Omega_m	float		The cosmic density of matter relative to the critical density.
sigma_8	params_sigma_8	float		The normalization of the primordial density fluctuations.
A_SN1	params_A_SN1	float		A normalization factor for the flux of galactic winds.
A_AGN1	params_A_AGN1	float		A normalization factor for the overall energy output of AGN feedback.
A_SN2	params_A_SN2	float		A normalization factor for the speed of galactic winds.
A_AGN2	params_A_AGN2	float		A normalization factor for the specific energy of AGN feedback.
snap	snapshot	short		Snapshot number, which can be connected to the redshift of the snapshot.
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.
GasMetalFractions		float		Individual abundances: dimensionless ratio of the total mass in that species divided by the total gas mass, for all gas cells in the group.
H	Group_GasMetalFractions_H	float
He	Group_GasMetalFractions_He	float
C	Group_GasMetalFractions_C	float
N	Group_GasMetalFractions_N	float
O	Group_GasMetalFractions_O	float
Ne	Group_GasMetalFractions_Ne	float
Mg	Group_GasMetalFractions_Mg	float
Si	Group_GasMetalFractions_Si	float
Fe	Group_GasMetalFractions_Fe	float
total	Group_GasMetalFractions_total	float		The 'total' of all other (i.e. untracked) metals.
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.
StarMetalFractions		float		Individual abundances: dimensionless ratio of the total mass in that species divided by the total stellar mass, for all stars in the group.
H	Group_StarMetalFractions_H	float
He	Group_StarMetalFractions_He	float
C	Group_StarMetalFractions_C	float
N	Group_StarMetalFractions_N	float
O	Group_StarMetalFractions_O	float
Ne	Group_StarMetalFractions_Ne	float
Mg	Group_StarMetalFractions_Mg	float
Si	Group_StarMetalFractions_Si	float
Fe	Group_StarMetalFractions_Fe	float
total	Group_StarMetalFractions_total	float		The 'total' of all other (i.e. untracked) metals.
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.
Subhalo		float		Subfind Subhalos
id	Subhalo_id	integer		Subhalo 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.
BfldDisk	Subhalo_BfldDisk	float	$(h/a^2)(\rm{UnitPressure})^{1/2}$	The square root of the volume weighted value of $B^{2}$ for all gas cells within the canonical two times the stellar half mass radius. This value gives a magnetic field strength which would have the same amount of mean magnetic energy as the galaxy cells.
BfldHalo	Subhalo_BfldHalo	float	$(h/a^2)(\rm{UnitPressure})^{1/2}$	The square root of the volume weighted value of $B^{2}$ for all gas cells in the subhalo. This value gives a magnetic field strength which would have the same amount of mean magnetic energy as the subhalo cells.
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
GasMetalFractions		float		Individual abundances: dimensionless ratio of the total mass in that species divided by the total gas mass, both restricted to gas cells within twice the stellar half mass radius.
H	Subhalo_GasMetalFractions_H	float
He	Subhalo_GasMetalFractions_He	float
C	Subhalo_GasMetalFractions_C	float
N	Subhalo_GasMetalFractions_N	float
O	Subhalo_GasMetalFractions_O	float
Ne	Subhalo_GasMetalFractions_Ne	float
Mg	Subhalo_GasMetalFractions_Mg	float
Si	Subhalo_GasMetalFractions_Si	float
Fe	Subhalo_GasMetalFractions_Fe	float
total	Subhalo_GasMetalFractions_total	float		The 'total' of all other (i.e. untracked) metals.
GasMetalFractionsHalfRad		float		Same as SubhaloGasMetalFractions, but restricted to cells within the stellar half mass radius.
H	Subhalo_GasMetalFractionsHalfRad_H	float
He	Subhalo_GasMetalFractionsHalfRad_He	float
C	Subhalo_GasMetalFractionsHalfRad_C	float
N	Subhalo_GasMetalFractionsHalfRad_N	float
O	Subhalo_GasMetalFractionsHalfRad_O	float
Ne	Subhalo_GasMetalFractionsHalfRad_Ne	float
Mg	Subhalo_GasMetalFractionsHalfRad_Mg	float
Si	Subhalo_GasMetalFractionsHalfRad_Si	float
Fe	Subhalo_GasMetalFractionsHalfRad_Fe	float
total	Subhalo_GasMetalFractionsHalfRad_total	float		The 'total' of all other (i.e. untracked) metals.
GasMetalFractionsMaxRad		float		Same as SubhaloGasMetalFractions, but restricted to cells within the radius of $V_{ m max}
H	Subhalo_GasMetalFractionsMaxRad_H	float
He	Subhalo_GasMetalFractionsMaxRad_He	float
C	Subhalo_GasMetalFractionsMaxRad_C	float
N	Subhalo_GasMetalFractionsMaxRad_N	float
O	Subhalo_GasMetalFractionsMaxRad_O	float
Ne	Subhalo_GasMetalFractionsMaxRad_Ne	float
Mg	Subhalo_GasMetalFractionsMaxRad_Mg	float
Si	Subhalo_GasMetalFractionsMaxRad_Si	float
Fe	Subhalo_GasMetalFractionsMaxRad_Fe	float
total	Subhalo_GasMetalFractionsMaxRad_total	float		The 'total' of all other (i.e. untracked) metals.
GasMetalFractionsSfr		float		Same as SubhaloGasMetalFractions, but restricted to cells which are star-forming.
H	Subhalo_GasMetalFractionsSfr_H	float
He	Subhalo_GasMetalFractionsSfr_He	float
C	Subhalo_GasMetalFractionsSfr_C	float
N	Subhalo_GasMetalFractionsSfr_N	float
O	Subhalo_GasMetalFractionsSfr_O	float
Ne	Subhalo_GasMetalFractionsSfr_Ne	float
Mg	Subhalo_GasMetalFractionsSfr_Mg	float
Si	Subhalo_GasMetalFractionsSfr_Si	float
Fe	Subhalo_GasMetalFractionsSfr_Fe	float
total	Subhalo_GasMetalFractionsSfr_total	float		The 'total' of all other (i.e. untracked) metals.
GasMetalFractionsSfrWeighted		float		Same as SubhaloGasMetalFractions, but weighted by the cell star-formation rate rather than the cell mass.
H	Subhalo_GasMetalFractionsSfrWeighted_H	float
He	Subhalo_GasMetalFractionsSfrWeighted_He	float
C	Subhalo_GasMetalFractionsSfrWeighted_C	float
N	Subhalo_GasMetalFractionsSfrWeighted_N	float
O	Subhalo_GasMetalFractionsSfrWeighted_O	float
Ne	Subhalo_GasMetalFractionsSfrWeighted_Ne	float
Mg	Subhalo_GasMetalFractionsSfrWeighted_Mg	float
Si	Subhalo_GasMetalFractionsSfrWeighted_Si	float
Fe	Subhalo_GasMetalFractionsSfrWeighted_Fe	float
total	Subhalo_GasMetalFractionsSfrWeighted_total	float		The 'total' of all other (i.e. untracked) metals.
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	integer		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 back into this same Subhalo table of the unique Subfind 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	$(kpc/h)(km/s)$
StarMetalFractions		float		Individual abundances: dimensionless ratio of the total mass in that species divided by the total stellar mass, both restricted to stars within twice the stellar half mass radius.
H	Subhalo_StarMetalFractions_H	float
He	Subhalo_StarMetalFractions_He	float
C	Subhalo_StarMetalFractions_C	float
N	Subhalo_StarMetalFractions_N	float
O	Subhalo_StarMetalFractions_O	float
Ne	Subhalo_StarMetalFractions_Ne	float
Mg	Subhalo_StarMetalFractions_Mg	float
Si	Subhalo_StarMetalFractions_Si	float
Fe	Subhalo_StarMetalFractions_Fe	float
total	Subhalo_StarMetalFractions_total	float		The 'total' of all other (i.e. untracked) metals.
StarMetalFractionsHalfRad		float		Same as StarMetalFractions, but restricted to cells within the stellar half mass radius.
H	Subhalo_StarMetalFractionsHalfRad_H	float
He	Subhalo_StarMetalFractionsHalfRad_He	float
C	Subhalo_StarMetalFractionsHalfRad_C	float
N	Subhalo_StarMetalFractionsHalfRad_N	float
O	Subhalo_StarMetalFractionsHalfRad_O	float
Ne	Subhalo_StarMetalFractionsHalfRad_Ne	float
Mg	Subhalo_StarMetalFractionsHalfRad_Mg	float
Si	Subhalo_StarMetalFractionsHalfRad_Si	float
Fe	Subhalo_StarMetalFractionsHalfRad_Fe	float
total	Subhalo_StarMetalFractionsHalfRad_total	float		The 'total' of all other (i.e. untracked) metals.
StarMetalFractionsMaxRad		float		Same as StarMetalFractions, but restricted to stars within the radius of $V_{ m max}$.
H	Subhalo_StarMetalFractionsMaxRad_H	float
He	Subhalo_StarMetalFractionsMaxRad_He	float
C	Subhalo_StarMetalFractionsMaxRad_C	float
N	Subhalo_StarMetalFractionsMaxRad_N	float
O	Subhalo_StarMetalFractionsMaxRad_O	float
Ne	Subhalo_StarMetalFractionsMaxRad_Ne	float
Mg	Subhalo_StarMetalFractionsMaxRad_Mg	float
Si	Subhalo_StarMetalFractionsMaxRad_Si	float
Fe	Subhalo_StarMetalFractionsMaxRad_Fe	float
total	Subhalo_StarMetalFractionsMaxRad_total	float		The 'total' of all other (i.e. untracked) metals.
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).

About Catalog

CAMELS stands for Cosmology and Astrophysics with MachinE Learning Simulations, and is a suite 4,233 cosmological simulations: 2,049 N-body and 2,184 state-of-the-art (magneto-)hydrodynamic suites.

The CAMELS simulations can be organized in three different suites:

IllustrisTNG. This suite contains 1,092 hydrodynamic simulations that have been run with the AREPO code employing the same subgrid physics as the original IllustrisTNG simulations.
SIMBA. This suite contains 1,092 hydrodynamic simulations that have been run with the GIZMO code employing the same subgrid physics as the original SIMBA simulation.
N-body. This suite contains 2,049 N-body simulation. For each CAMELS hydrodynamic simulation there is an N-body simulation with the same cosmology and value of the initial random seed as its hydrodynamic counterpart.

Each simulation suite contains four different simulation sets:

LH. This set contains 1,000 simulations. Each simulation has a different value of the cosmological and astrophysical parameters, that are arranged in a latin-hypercube. Each simulation has a different value of the initial random seed. This set represents the main CAMELS dataset. LH stands for Latin-Hypercube.
1P. This set contains 61 simulations. In this set, the value of the cosmological and astrophysical parameters in the simulations is varied only one at a time. The value of the random seed is the same in all simulations. This set is typically used to study the change induced by cosmology and astrophysics in a given quantity. 1P stands for 1-parameter at a time.
CV. This set contains 27 simulations. All the simulations share the value of the cosmological and astrophysical parameters, and they only differ in the value of their initial random seed. This set is typically used to study the effect of cosmic variance. CV stands for Cosmic Variance.
EX. This set contains 4 simulations. All simulations share the value of the cosmological parameters, but differ in the value of the astrophysical parameters. One simulation has fiducial values; the other three represent extreme cases with 1) very efficient supernova feedback, 2) very efficient AGN feedback, and 3) no feedback. All simulations share the value of the initial random seed. This set can be used to study the maximum effect astrophysics can have on a given quantity. EX stands for Extreme.

For more information on CAMELS, please consult the documentation and the project website.

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simulation_suite e.g. 'IllustrisTNG' or 'SIMBA'.	simulation_set e.g. 'LH', '1P', 'CV' or 'EX'.	simulation_set_id Integer ID of the simulation set. E.g. for IllustrisTNG LH 12, this value is '12'.	params Simulation parameter:						snap Snapshot number, which can be connected to the redshift of the snapshot.	z Redshift of the snapshot corresponding to this group catalog.	type	id Group index number	Group FoF Halos																																																											Subhalo Subfind Subhalos
			Omega_m The cosmic density of matter relative to the critical density.	sigma_8 The normalization of the primordial density fluctuations.	A_SN1 A normalization factor for the flux of galactic winds.	A_AGN1 A normalization factor for the overall energy output of AGN feedback.	A_SN2 A normalization factor for the speed of galactic winds.	A_AGN2 A normalization factor for the specific energy of AGN feedback.					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.	GasMetalFractions Individual abundances: dimensionless ratio of the total mass in that species divided by the total gas mass, for all gas cells in the group.										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.	StarMetalFractions Individual abundances: dimensionless ratio of the total mass in that species divided by the total stellar mass, for all stars in the 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.	id Subhalo 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.	BfldDisk $(h/a^2)(\rm{UnitPressure})^{1/2}$ The square root of the volume weighted value of $B^{2}$ for all gas cells within the canonical two times the stellar half mass radius. This value gives a magnetic field strength which would have the same amount of mean magnetic energy as the galaxy cells.	BfldHalo $(h/a^2)(\rm{UnitPressure})^{1/2}$ The square root of the volume weighted value of $B^{2}$ for all gas cells in the subhalo. This value gives a magnetic field strength which would have the same amount of mean magnetic energy as the subhalo cells.	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.			GasMetalFractions Individual abundances: dimensionless ratio of the total mass in that species divided by the total gas mass, both restricted to gas cells within twice the stellar half mass radius.										GasMetalFractionsHalfRad Same as SubhaloGasMetalFractions, but restricted to cells within the stellar half mass radius.										GasMetalFractionsMaxRad Same as SubhaloGasMetalFractions, but restricted to cells within the radius of $V_{ m max}										GasMetalFractionsSfr Same as SubhaloGasMetalFractions, but restricted to cells which are star-forming.										GasMetalFractionsSfrWeighted Same as SubhaloGasMetalFractions, but weighted by the cell star-formation rate rather than the cell mass.										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 back into this same Subhalo table of the unique Subfind 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.			StarMetalFractions Individual abundances: dimensionless ratio of the total mass in that species divided by the total stellar mass, both restricted to stars within twice the stellar half mass radius.										StarMetalFractionsHalfRad Same as StarMetalFractions, but restricted to cells within the stellar half mass radius.										StarMetalFractionsMaxRad Same as StarMetalFractions, but restricted to stars within the radius of $V_{ m max}$.										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).
															${\rm CM}_x$ ckpc/h	${\rm CM}_y$ ckpc/h	${\rm CM}_z$ ckpc/h		H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.			$N_{\rm gas}$	$N_{\rm DM}$	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		H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.		$v_x$ km/s/a	$v_y$ km/s/a	$v_z$ km/s/a										id Subhalo index number					x ckpc/h	y ckpc/h	z ckpc/h	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.								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 $(kpc/h)(km/s)$	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.	H	He	C	N	O	Ne	Mg	Si	Fe	total The 'total' of all other (i.e. untracked) metals.				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

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