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.
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
FieldVariableTypeUnitsDescription
simulationsimulationbytee.g. 'Illustris-1' or 'Illustris-2-Dark'.
snapsnapshotshortsnapshot number
timetimefloatScalefactor of the snapshot corresponding to this group catalog.
zredshiftfloatRedshift of the snapshot corresponding to this group catalog.
ididintegerGroup index number
BHMassBHMassfloat\(10^{10}M_\odot/h\)Sum of the BH_Mass field of all blackholes (type 5) in this group.
\(\dot{M}_{\rm BH}\)BHMdotfloat\((10^{10}M_\odot/h)/(0.978Gyr/h)\)Sum of the BH_Mdot field of all blackholes (type 5) in this group.
CMfloatckpc/hCenter 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_xfloat
\({\rm CM}_y\)CM_yfloat
\({\rm CM}_z\)CM_zfloat
FirstSubFirstSubintegerIndex into the <code>Subhalo</code> 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.
GasMetallicityGasMetallicityfloatMass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all gas cells in this FOF group.
\(N_{\rm part}\)LenintegerInteger counter of the total number of particles/cells of all types in this group.
LenTypeintegerInteger 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_gasinteger
\(N_{\rm DM}\)LenType_dminteger
unusedLenType_unusedinteger
tracersLenType_tracersinteger
\(N_{\rm stars}\)LenType_starsinteger
\(N_{\rm BH}\)LenType_bhinteger
\(M_{\rm tot}\)Massfloat\(10^{10}M_\odot/h\)Sum of the individual masses of every particle/cell, of all types, in this group.
MassTypefloat\(10^{10}M_\odot/h\)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_gasfloat
\(M_{\rm DM}\)MassType_dmfloat
unusedMassType_unusedfloat
tracersMassType_tracersfloat
\(M_{\star}\)MassType_starsfloat
\(M_{\rm BH}\)MassType_bhfloat
NsubsNsubsintegerCount of the total number of Subfind groups within this FoF group.
Posfloatckpc/hSpatial position within the periodic box of the maximum bound particle. Comoving coordinate.
xPos_xfloat
yPos_yfloat
zPos_zfloat
SFRSFRfloat\(M_\odot/yr\)Sum of the individual star formation rates of all gas cells in this group.
StarMetallicityStarMetallicityfloatMass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all star particles in this FOF group.
velfloatkm/s/aVelocity 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_xfloat
\(v_y\)Vel_yfloat
\(v_z\)Vel_zfloat
WindMassWindMassfloat\(10^{10}M_\odot/h\)Sum of the individual masses of all wind phase gas cells (type 4, BirthTime <= 0) in this group.
M_Crit200M_Crit200float\(10^{10}M_\odot/h\)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_Crit500M_Crit500float\(10^{10}M_\odot/h\)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_Mean200M_Mean200float\(10^{10}M_\odot/h\)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_TopHat200M_TopHat200float\(10^{10}M_\odot/h\)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 <a href="http://adsabs.harvard.edu/abs/1998ApJ...495...80B">Bryan+ 1998</a>). The subscript 200 can be ignored.
R_Crit200R_Crit200floatckpc/hComoving 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_Crit500R_Crit500floatckpc/hComoving 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_Mean200R_Mean200floatckpc/hComoving 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_TopHat200R_TopHat200floatckpc/hComoving 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.
SnapByTypelong
gasSnapByType_gaslong
dmSnapByType_dmlong
unusedSnapByType_unusedlong
tracersSnapByType_tracerslong
starsSnapByType_starslong
bhSnapByType_bhlong
FuzzByTypelong
gasFuzzByType_gaslong
dmFuzzByType_dmlong
unusedFuzzByType_unusedlong
tracersFuzzByType_tracerslong
starsFuzzByType_starslong
bhFuzzByType_bhlong
About Catalog

Nelson+ (2015), Illustris FoF Halo catalog derived with a standard friends-of-friends (FoF) algorithm.

Active Filters

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Format

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Raw Data
simulatione.g. 'Illustris-1' or 'Illustris-2-Dark'.snapsnapshot numbertimeScalefactor of the snapshot corresponding to this group catalog.zRedshift of the snapshot corresponding to this group catalog.idGroup index numberBHMass
\(10^{10}M_\odot/h\)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.
CMckpc/hCenter 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)FirstSubIndex into the <code>Subhalo</code> 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.GasMetallicityMass-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.LenTypeInteger 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.NsubsCount of the total number of Subfind groups within this FoF group.Posckpc/hSpatial 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.
StarMetallicityMass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of all star particles in this FOF group.velkm/s/aVelocity 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 <a href="http://adsabs.harvard.edu/abs/1998ApJ...495...80B">Bryan+ 1998</a>). The subscript 200 can be ignored.
R_Crit200
ckpc/hComoving 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/hComoving 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/hComoving 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/hComoving 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.
SnapByTypeFuzzByType
\({\rm CM}_x\)\({\rm CM}_y\)\({\rm CM}_z\)\(N_{\rm gas}\)\(N_{\rm DM}\)unusedtracers\(N_{\rm stars}\)\(N_{\rm BH}\)\(M_{\rm gas}\)\(M_{\rm DM}\)unusedtracers\(M_{\star}\)\(M_{\rm BH}\)xyz\(v_x\)\(v_y\)\(v_z\)gasdmunusedtracersstarsbhgasdmunusedtracersstarsbh