The table stores all the subhalos identified with the SUBFIND algorithm in the friends-of-friends groups
identified within the Millennium-II Simulation
of the FOF groups themselves are stored in the
FOF table.
| column | type | UCD | unit | description |
| subHaloId |
long |
meta.id; |
|
The id of this subhalo based on its rank within its parent FOF halo.
|
| fofId |
long |
meta.id; |
|
The id of FOF group this subhalo belongs to.
|
subHaloFileId |
long |
meta.id; |
|
Alternative id of this subhalo based on its rank within the SUBFIND result file.
|
| snapNum |
int |
time |
|
The snapshot number where this subhalo was identified.
This column corresponds to the snapnum column in
the Snapshots table in the Millennium-II database.
|
| redshift |
float |
time |
|
The redshift of the snapshot to which this subhalo belongs.
|
| np |
int |
meta.number |
|
Number of simulation particles in this subhalo.
|
| mass |
real |
|
1010 Msun/h |
Mass of this subhalo, given by the product of the number of particles and the mass per particle.
|
| x |
float |
pos.cartesian.x |
Mpc/h |
The X-coordinate of the position, determined by the particle with the minimum gravitational potential, in comoving coordinates.
|
| y |
float |
pos.cartesian.y |
Mpc/h |
The Y-coordinate of the position, determined by the particle with the minimum gravitational potential, in comoving coordinates.
|
| z |
float |
pos.cartesian.z |
Mpc/h |
The Z-coordinate of the position, determined by the particle with the minimum gravitational potential, in comoving coordinates.
|
| ix |
integer |
pos.cartesian.x |
|
Zone index along x-direction, based on 20 bins
See the text on spatial indexes.
|
| iy |
integer |
pos.cartesian.x |
|
Zone index along y-direction, based on 20 bins
See the text on spatial indexes.
|
| iz |
integer |
pos.cartesian.x |
|
Zone index along z-direction, based on 20 bins
See the text on spatial indexes.
|
| phKey |
int |
|
|
The Peano-Hilbert index for the position of this subhalo.
|
| velX |
float |
phys.veloc |
km/sec |
The X-component of the peculiar velocity.
|
| velY |
float |
phys.veloc |
km/sec |
The Y-component of the peculiar velocity.
|
| velZ |
float |
phys.veloc |
km/sec |
The Z-component of the peculiar velocity.
|
| cmx |
float |
|
Mpc/h |
The X-coordinate of the subhalo's center of mass, in comoving coordinates.
|
| cmy |
float |
|
Mpc/h |
The Y-coordinate of the subhalo's center of mass, in comoving coordinates.
|
| cmz |
float |
|
Mpc/h |
The Z-coordinate of the subhalo's center of mass, in comoving coordinates.
|
| spinX |
float |
phys.veloc.ang |
(Mpc/h) (km/sec) |
The X-component of the spin of the subhalo.
|
| spinY |
float |
phys.veloc.ang |
(Mpc/h) (km/sec) |
The Y-component of the spin of the subhalo.
|
| spinZ |
float |
phys.veloc.ang |
(Mpc/h) (km/sec) |
The Z-component of the spin of the subhalo.
|
| halfmassRadius |
float |
phys.size.radius |
Mpc/h |
Radius containing half of the mass of the subhalo.
|
| vDisp |
float |
phys.veloc.dispersion |
km/sec |
The 1-D velocity dispersion of the subhalo, computed from all of the subhalo particles.
|
| vMax |
float |
phys.veloc.rotat |
km/sec |
Maximum of the circular velocity curve vCirc, where
vCirc2=G M(< r)/r
|
| vMaxRad |
float |
|
Mpc/h |
The radius at which the circular velocity maximum vMax is attained
|
| mostBoundID |
long |
meta.id.assoc |
|
The id of the most bound particle of this subhalo.
|
