Illustris FoF Halos
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.
For log functionality, set the filter to enable only positive values.
For log functionality, set the filter to enable only positive values.
For log functionality, set the filter to enable only positive values.
Count: Choose whether the object count per bin is shown in linear or log scale. Count is shown on the Y axis. Count is shown on the color (Z) axis.
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μ : {{filter.aggs.avg?filter.render(filter.aggs.avg):'no data'}}
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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

Group index number




BHMass
BHMass
float
\(10^{10}M_\odot/h\)
Sum of the BH_Mass field of all blackholes (type 5) in this group.




\(\dot{M}_{\rm BH}\)
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)




\({\rm CM}_x\)
CM_x
float
ckpc/h





\({\rm CM}_y\)
CM_y
float
ckpc/h





\({\rm CM}_z\)
CM_z
float
ckpc/h





FirstSub
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
GasMetallicity
float

Mass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all gas cells in this FOF group.




\(N_{\rm part}\)
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.




\(N_{\rm gas}\)
LenType_gas
integer






\(N_{\rm DM}\)
LenType_dm
integer






unused
LenType_unused
integer






tracers
LenType_tracers
integer






\(N_{\rm stars}\)
LenType_stars
integer






\(N_{\rm BH}\)
LenType_bh
integer






\(M_{\rm tot}\)
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.




\(M_{\rm gas}\)
MassType_gas
float
\(10^{10}M_\odot/h\)





\(M_{\rm DM}\)
MassType_dm
float
\(10^{10}M_\odot/h\)





unused
MassType_unused
float
\(10^{10}M_\odot/h\)





tracers
MassType_tracers
float
\(10^{10}M_\odot/h\)





\(M_{\star}\)
MassType_stars
float
\(10^{10}M_\odot/h\)





\(M_{\rm BH}\)
MassType_bh
float
\(10^{10}M_\odot/h\)





Nsubs
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
Pos_x
float
ckpc/h





y
Pos_y
float
ckpc/h





z
Pos_z
float
ckpc/h





SFR
SFR
float
\(M_\odot/yr\)
Sum of the individual star formation rates of all gas cells in this group.




StarMetallicity
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 \(1/a.\)




\(v_x\)
Vel_x
float
km/s/a





\(v_y\)
Vel_y
float
km/s/a





\(v_z\)
Vel_z
float
km/s/a





WindMass
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
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
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
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
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
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
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
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
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
SnapByType_gas
long






dm
SnapByType_dm
long






unused
SnapByType_unused
long






tracers
SnapByType_tracers
long






stars
SnapByType_stars
long






bh
SnapByType_bh
long






FuzzByType

long






gas
FuzzByType_gas
long






dm
FuzzByType_dm
long






unused
FuzzByType_unused
long






tracers
FuzzByType_tracers
long






stars
FuzzByType_stars
long






bh
FuzzByType_bh
long














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).





















Active Filters




{{filter.field.name}}







Format


Download







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
Group index number



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




\({\rm CM}_x\)
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