Illustris Subfind Subhalos
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.
ididintegerSubgroup index number
BHMassBHMassfloat\(10^{10}M_\odot/h\)Sum of the masses of all blackholes in this subhalo.
BHMdotBHMdotfloat\((10^{10}M_\odot/h)/(0.978Gyr/h)\)Sum of the instantaneous accretion rates \(\dot{M}\) of all blackholes in this subhalo.
CMfloatckpc/hComoving 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.
xCM_xfloat
yCM_yfloat
zCM_zfloat
GasMetallicityGasMetallicityfloatMass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the gas cells bound to this Subhalo, but restricted to cells within <b>twice</b> the stellar half mass radius.
GasMetallicityHalfRadGasMetallicityHalfRadfloatSame as SubhaloGasMetallicity, but restricted to cells within the stellar half mass radius.
GasMetallicityMaxRadGasMetallicityMaxRadfloatSame as SubhaloGasMetallicity, but restricted to cells within the radius of \(V_{max}\).
GasMetallicitySfrGasMetallicitySfrfloatMass-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.
GasMetallicitySfrWeightedGasMetallicitySfrWeightedfloatSame as SubhaloGasMetallicitySfr, but weighted by the cell star-formation rate rather than the cell mass.
GrNrGrNrintegerIndex into the Group table of the FOF host/parent of this Subhalo.
HalfmassRadHalfmassRadfloatckpc/hComoving radius containing half of the total mass (SubhaloMass) of this Subhalo.
HalfmassRadTypefloatckpc/hComoving radius containing half of the mass of this Subhalo split by Type (SubhaloMassType).
gasHalfmassRadType_gasfloat
dmHalfmassRadType_dmfloat
unusedHalfmassRadType_unusedfloat
tracersHalfmassRadType_tracersfloat
starsHalfmassRadType_starsfloat
bhHalfmassRadType_bhfloat
IDMostboundIDMostboundlongThe ID of the particle with the smallest binding energy (could be any type).
LenLenintegerTotal number of member particle/cells in this Subhalo, of all types.
LenTypeintegerTotal number of member particle/cells in this Subhalo, separated by type.
gasLenType_gasinteger
dmLenType_dminteger
unusedLenType_unusedinteger
tracersLenType_tracersinteger
starsLenType_starsinteger
bhLenType_bhinteger
MassMassfloat\(10^{10}M_\odot/h\)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.
MassInHalfRadMassInHalfRadfloat\(10^{10}M_\odot/h\)Sum of masses of all particles/cells within the stellar half mass radius.
MassInHalfRadTypefloat\(10^{10}M_\odot/h\)Sum of masses of all particles/cells (split by type) within the stellar half mass radius.
gasMassInHalfRadType_gasfloat
dmMassInHalfRadType_dmfloat
unusedMassInHalfRadType_unusedfloat
tracersMassInHalfRadType_tracersfloat
starsMassInHalfRadType_starsfloat
bhMassInHalfRadType_bhfloat
MassInMaxRadMassInMaxRadfloat\(10^{10}M_\odot/h\)Sum of masses of all particles/cells within the radius of \(V_{max}\).
MassInMaxRadTypefloat\(10^{10}M_\odot/h\)Sum of masses of all particles/cells (split by type) within the radius of \(V_{max}\).
gasMassInMaxRadType_gasfloat
dmMassInMaxRadType_dmfloat
unusedMassInMaxRadType_unusedfloat
tracersMassInMaxRadType_tracersfloat
starsMassInMaxRadType_starsfloat
bhMassInMaxRadType_bhfloat
MassInRadMassInRadfloat\(10^{10}M_\odot/h\)Sum of masses of all particles/cells within <b>twice</b> the stellar half mass radius.
MassInRadTypefloat\(10^{10}M_\odot/h\)Sum of masses of all particles/cells (split by type) within <b>twice</b> the stellar half mass radius.
gasMassInRadType_gasfloat
dmMassInRadType_dmfloat
unusedMassInRadType_unusedfloat
tracersMassInRadType_tracersfloat
starsMassInRadType_starsfloat
bhMassInRadType_bhfloat
MassTypefloat\(10^{10}M_\odot/h\)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.
gasMassType_gasfloat
dmMassType_dmfloat
unusedMassType_unusedfloat
tracersMassType_tracersfloat
starsMassType_starsfloat
bhMassType_bhfloat
ParentParentintegerIndex 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.
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 subhalo.
SFRinHalfRadSFRinHalfRadfloat\(M_\odot/yr\)Same as SubhaloSFR, but restricted to cells within the stellar half mass radius.
SFRinMaxRadSFRinMaxRadfloat\(M_\odot/yr\)Same as SubhaloSFR, but restricted to cells within the radius of \(V_{max}\).
SFRinRadSFRinRadfloat\(M_\odot/yr\)Same as SubhaloSFR, but restricted to cells within <b>twice</b> the stellar half mass radius.
Spinfloat\((kpc/h)(km/s)\)Total spin per axis, computed for each as the mass weighted sum of the relative coordinate times relative velocity of all member particles/cells.
xSpin_xfloat
ySpin_yfloat
zSpin_zfloat
StarMetallicityStarMetallicityfloat-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 <b>twice</b> the stellar half mass radius.
StarMetallicityHalfRadStarMetallicityHalfRadfloatSame as SubhaloStarMetallicity, but restricted to stars within the stellar half mass radius.
StarMetallicityMaxRadStarMetallicityMaxRadfloat-Same as SubhaloStarMetallicity, but restricted to stars within the radius of \(V_{max}\).
StellarPhotometricsfloatmagEight 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.
UStellarPhotometrics_Ufloat
BStellarPhotometrics_Bfloat
VStellarPhotometrics_Vfloat
KStellarPhotometrics_Kfloat
gStellarPhotometrics_gfloat
rStellarPhotometrics_rfloat
iStellarPhotometrics_ifloat
zStellarPhotometrics_zfloat
StellarPhotometricsMassInRadStellarPhotometricsMassInRadfloat\(10^{10}M_\odot/h\)Sum of the mass of the member stellar particles, but restricted to stars within the radius SubhaloStellarPhotometricsRad.
StellarPhotometricsRadStellarPhotometricsRadfloatckpc/hRadius 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).
Velfloatkm/sPeculiar 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.
xVel_xfloat
yVel_yfloat
zVel_zfloat
VelDispVelDispfloatkm/sOne-dimensional velocity dispersion of all the member particles/cells (the 3D dispersion divided by \(\sqrt{3}\)).
VmaxVmaxfloatkm/sMaximum value of the spherically-averaged rotation curve.
VmaxRadVmaxRadfloatkpc/hComoving radius of rotation curve maximum (where \(V_{max}\) is achieved).
WindMassWindMassfloat\(10^{10}M_\odot/h\)Sum of masses of all wind-phase cells in this subhalo (with Type==4 and BirthTime&#60;=0).
SnapByTypelong
gasSnapByType_gaslong
dmSnapByType_dmlong
unusedSnapByType_unusedlong
tracersSnapByType_tracerslong
starsSnapByType_starslong
bhSnapByType_bhlong

Active Filters

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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.idSubgroup index numberBHMass
\(10^{10}M_\odot/h\)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.
CMckpc/hComoving 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.GasMetallicityMass-weighted average metallicity (Mz/Mtot, where Z = any element above He) of the gas cells bound to this Subhalo, but restricted to cells within <b>twice</b> the stellar half mass radius.GasMetallicityHalfRadSame as SubhaloGasMetallicity, but restricted to cells within the stellar half mass radius.GasMetallicityMaxRadSame as SubhaloGasMetallicity, but restricted to cells within the radius of \(V_{max}\).GasMetallicitySfrMass-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.GasMetallicitySfrWeightedSame as SubhaloGasMetallicitySfr, but weighted by the cell star-formation rate rather than the cell mass.GrNrIndex into the Group table of the FOF host/parent of this Subhalo.HalfmassRad
ckpc/hComoving radius containing half of the total mass (SubhaloMass) of this Subhalo.
HalfmassRadTypeckpc/hComoving radius containing half of the mass of this Subhalo split by Type (SubhaloMassType).IDMostboundThe ID of the particle with the smallest binding energy (could be any type).LenTotal number of member particle/cells in this Subhalo, of all types.LenTypeTotal 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 <b>twice</b> the stellar half mass radius.
MassInRadType\(10^{10}M_\odot/h\)Sum of masses of all particles/cells (split by type) within <b>twice</b> 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.ParentIndex 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.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 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 <b>twice</b> 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 <b>twice</b> the stellar half mass radius.
StarMetallicityHalfRadSame as SubhaloStarMetallicity, but restricted to stars within the stellar half mass radius.StarMetallicityMaxRad
-Same as SubhaloStarMetallicity, but restricted to stars within the radius of \(V_{max}\).
StellarPhotometricsmagEight 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/hRadius 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).
Velkm/sPeculiar 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/sOne-dimensional velocity dispersion of all the member particles/cells (the 3D dispersion divided by \(\sqrt{3}\)).
Vmax
km/sMaximum value of the spherically-averaged rotation curve.
VmaxRad
kpc/hComoving 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&#60;=0).
SnapByType
xyzgasdmunusedtracersstarsbhgasdmunusedtracersstarsbhgasdmunusedtracersstarsbhgasdmunusedtracersstarsbhgasdmunusedtracersstarsbhgasdmunusedtracersstarsbhxyzxyzUBVKgrizxyzgasdmunusedtracersstarsbh