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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Range:

{{filter.render(filter.aggs.min)}}

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Python Query

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
\({\rm CM}_y\) CM_y float
\({\rm CM}_z\) CM_z float
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
\(M_{\rm DM}\) MassType_dm float
unused MassType_unused float
tracers MassType_tracers float
\(M_{\star}\) MassType_stars float
\(M_{\rm BH}\) MassType_bh float
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
y Pos_y float
z Pos_z float
SFR SFR float \(M_\odot/yr\) Sum of the individual star formation rates of all gas cells in this 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
\(v_y\) Vel_y float
\(v_z\) Vel_z float
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

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Format

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Raw Data
simulation e.g. 'Illustris-1' or 'Illustris-2-Dark'. snap snapshot number time Scalefactor of the snapshot corresponding to this group catalog. z Redshift of the snapshot corresponding to this group catalog. id 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
\({\rm CM}_x\) \({\rm CM}_y\) \({\rm CM}_z\) \(N_{\rm gas}\) \(N_{\rm DM}\) unused tracers \(N_{\rm stars}\) \(N_{\rm BH}\) \(M_{\rm gas}\) \(M_{\rm DM}\) unused tracers \(M_{\star}\) \(M_{\rm BH}\) x y z \(v_x\) \(v_y\) \(v_z\) gas dm unused tracers stars bh gas dm unused tracers stars bh