2.4.6 : BDMWprof
This table stores the radial profiles to a selection of halos with more than 100 particles from the halo catalogues determined using the Bound Density Maximum (BDM) algorithm. The W in the table name indicates that
the halos are cut-off at 200*ρcrit (critical density).
Physical quantities have been obtained for all (bound + unbound) particles and bound particles only
up to a radius of 2 Rvir. Radial bins are spaced in constant log. Each radial bin of a halo is one row in BDMWprof. To obtain the radial profile of a quantity, retrieve all the rows corresponding to one BDM halo id (bdmId) and sort them by radius.
If a radial bin contained no particle, it was skipped and was not added to the table.
In general, the bdmProfileId is already sorted by increasing radius for a given BDM halo id (bdmId).
| Column |
Type |
UCD |
Unit |
Description |
| bdmProfileId |
bigint | meta.id; meta.main |
|
unique id for BDM radial profile bin= ( snapnum*108 + (number in BDM catalogue) )
*103 + (number of radial bin per halo in BDM catalogue) |
| bdmId |
bigint |
meta.id |
|
unique id for bdm-halo = ( snapnum*108 + (number in BDM catalogue) ) |
| snapnum |
smallint |
time.epoch |
| number of snapshot
|
| NInCat
| int
| meta.id
|
| number of halo in BDM catalogue file (= "Nhalo")
|
| R_Rvir |
real | phys.size.radius |
|
average radius of particles in bin normalized to virial radius of all (bound + unbound) particles |
| Rbin | real
| phys.size.radius |
1/h kpc |
outer radius of bin |
| np |
int |
meta.number | |
number of all particles inside radial bin |
| mass | real
|
phys.mass | 1/h Msun |
mass of all particles within radius Rbin of bin |
| dens | real
| phys.density |
Msun h3 / comoving kpc3 |
differential density inside radial bin calculated from all particles at R_Rvir |
| Vcirc | real
| phys.veloc |
km/s |
circular velocity sqrt(GM/r) of all particles, where M is the mass inside the radius Rbin |
| VpropRms | real
| phys.veloc.dispMeasure |
km/s |
root mean square proper velocity of all particles inside radial bin |
| Vrad | real
| phys.veloc |
km/s |
average radial velocity of all particles inside radial bin |
| VradRms | real
| phys.veloc.dispMeasure |
km/s |
root mean square radial velocity of all particles inside radial bin |
| boundR_Rvir | real
|
phys.size.radius | |
average radius of particles in bin normalized to virial radius of only bound particles |
| boundNp |
int |
meta.number | |
number of only bound particles inside radial bin |
| boundMass | real
|
phys.mass |
1/h Msun |
mass of bound particles within radius Rbin of bin |
| boundDens | real
| phys.density |
Msun h3 / comoving kpc3 |
differential density inside radial bin calculated from bound particles only at R_Rvir |
| boundVcirc | real
|
phys.veloc |
km/s |
circular velocity sqrt(GM/r) of bound particles, where M is the mass inside the radius Rbin |
| boundVpropRms | real
|
phys.veloc.dispMeasure |
km/s |
root mean square proper velocity of bound particles inside radial bin |
| boundVrad | real
|
phys.veloc |
km/s |
average radial velocity of bound particles inside radial bin |
| boundVradRms | real
|
phys.veloc.dispMeasure |
km/s |
root mean square radial velocity of bound particles inside radial bin |
Example
Get halo profile of most massive BDM halo at z=0:
select * from Bolshoi..BDMWprof
where bdmId =
(select top 1 bdmId FROM Bolshoi..BDMW where snapnum=416 order by Mvir desc)
order by Rbin
This query retrieves the radial profile for the most massive halo from the BDMW-table for redshift 0 (snapshot number 416).
