This table contains the result of an L-Galaxies run on the milli-Millennium merger trees with the same
parameters as used in the full Millennium run described in
De Lucia and Blaizot 2006.
Note that galaxies without stars have been assigned the value 99 for all their magnitudes.
| column | type | UCD | unit | description |
|---|
| galaxyID |
long |
meta.id;meta.main |
|
ID of galaxy, unique within simulation and SAM run. |
| lastProgenitorId |
long |
meta.id.assoc |
|
All galaxies with id between this galaxyId and this lastProgenitorId together are the merger tree rooted in this galaxy.
|
| descendantId |
long |
meta.id.assoc |
|
Pointer to the descendant of this galaxy in its merger tree; -1 if there is no descendant
|
| haloID |
long |
meta.id.parent |
|
Unique ID of MPA halo containing this galaxy
|
| subHaloID |
long |
meta.id; |
|
The ID of the sub-halo this galaxy resides in. Identical to the subhaloId of the halo identified by the haloId. |
| fofID |
long |
meta.id; |
|
The id of the sub-halo at the center of the friends-of-friends (FOF) this galaxy resides in.
NB This is not equivalent to the firstSubhaloID column in the FOF table! |
| treeId |
long |
meta.id.parent |
|
unique id of galaxy formation tree containing this galaxy
|
| firstProgenitorId |
long |
meta.id.assoc |
|
Main progenitor of this galaxy. Also the first progenitor in a linked list representation of the merger tree. |
| nextProgenitorId |
long |
meta.id.assoc |
|
Next progenitor of this galaxy in linked list representation of merger tree
|
| type |
int |
src.class |
|
0,1 or 2 indicating whether this galaxy is a central galaxy of its FOF group, central galaxy of a subhalo, or a satellite galaxy. |
| snapnum |
int |
time |
|
The snapshot number where this galaxy was identified.
This column corresponds to the snapnum column in
the Snapshots table in this database.
|
| redshift |
float |
time |
|
redshift of the snapshot where this galaxy resides
|
| centralMvir |
float |
phys.veloc.dispersion |
1010/h Msun |
virial mass of background (FOF) halo containing this galaxy
|
| phkey |
int |
|
|
Peano-Hilbert key, (bits=5), for position in 62.5/h Mpc box
See the text on spatial indexes.
|
| x |
float |
pos.cartesian.x |
1/h Mpc |
The X-coordinate of the position in comoving coordinates.
|
| y |
float |
pos.cartesian.y |
1/h) Mpc |
The Y-coordinate of the position in comoving coordinates.
|
| z |
float |
pos.cartesian.z |
1/h Mpc |
The Z-coordinate of the position in comoving coordinates.
|
| zIndex |
long |
|
|
The "bit-interleaved" or "Z-curve" index, corresponding to this galaxy's position. Same resolution as phKey.
See the text on spatial indexes.
|
| ix |
integer |
pos.cartesian.x |
|
Zone index along x-direction, based on 7 bins
See the text on spatial indexes.
|
| iy |
integer |
pos.cartesian.x |
|
Zone index along y-direction, based on 7 bins
See the text on spatial indexes.
|
| iz |
integer |
pos.cartesian.x |
|
Zone index along z-direction, based on 7 bins
See the text on spatial indexes.
|
| velX |
float |
phys.veloc |
km/s |
The X-component of the physical peculiar velocity of the galaxy. |
| velY |
float |
phys.veloc |
km/s |
The Y-component of the physical peculiar velocity of the galaxy. |
| velZ |
float |
phys.veloc |
km/s |
The Z-component of the physical peculiar velocity of the galaxy. |
| np |
int |
meta.number |
|
Number of particles in halo the galaxy belongs to.
|
| mvir |
float |
phys.mass |
1010/h Msun |
Virial mass of the subhalo the galaxy is/was the center of.
|
| rvir |
float |
phys.size.radius |
Mpc/h |
Virial radius of the subhalo the galaxy is/was the center of.
|
| vvir |
float |
phys.veloc |
km/s |
Virial velocity of the subhalo the galaxy is/was the center of.
|
| vmax |
float |
phys.veloc.rotat |
km/s |
Maximum rotational velocity of the subhalo of which this galaxy is the center, or the last value for satellite galaxies.
|
| coldGas |
float |
phys.mass |
1010/h Msun |
Mass in cold gas.
|
| stellarMass |
float |
phys.mass |
1010/h Msun |
Mass in stars.
|
| bulgeMass |
float |
phys.mass |
1010/h Msun |
Mass of bulge.
|
| hotGas |
float |
phys.mass |
1010/h Msun |
Mass in hot gas component of this galaxy's subhalo. TBD on type 2 galaxies.
|
| ejectedMass |
float |
phys.mass |
1010/h Msun/h |
The ejected mass component (see de Lucia et al., 2004, MNRAS, Volume 349, 1101-1116).
|
| blackHoleMass |
float |
phys.mass |
1010/h Msun |
Mass of central black hole
|
| metalsColdGas |
float |
phys.mass |
1010/h Msun |
Mass in metals in cold gas.
|
| metalsStellarMass |
float |
phys.mass |
1010/h Msun |
Mass in metals in stars.
|
| metalsBulgeMass |
float |
phys.mass |
1010/h Msun |
Mass in metals in bulge.
|
| metalsHotGas |
float |
phys.mass |
1010/h Msun |
ratio of mass in metals.
|
| metalsEjectedMass |
float |
phys.mass |
1010/h Msun |
Mass in metals in ejected gas.
|
| sfr |
float |
phys.SFR |
Msun/yr |
Star formation rate
|
| sfrBulge |
float |
phys.SFR |
Msun/yr |
Star formation rate in the bulge.
|
| xrayLum |
float |
em.X-Ray |
TBD |
X-Ray luminosity
|
| diskRadius |
float |
phys.size.radius |
Mpc/h |
Disk radius, derived form halo radius ala
Mo, Mao and White (1997) |
| coolingRadius |
float |
phys.size.radius |
Mpc/h |
The radius within which the cooling time scale is shorter than the dynamical timescale
|
| mag_b |
float |
em.opt.B |
|
Absolute rest frame B (Buser B3 filter) magnitude (Vega) of galaxy.
|
| mag_v |
float |
em.opt.V |
|
Absolute rest frame V (Buser V filter) magnitude (Vega) of galaxy
|
| mag_r |
float |
em.opt.R |
|
Absolute rest frame R (Johnson R filter) magnitude (Vega) of galaxy.
|
| mag_i |
float |
em.opt.I |
|
Absolute rest frame I (Johnson I filter) magnitude (Vega) of galaxy.
|
| mag_k |
float |
em.opt |
|
Absolute rest frame K (Johnson K filter) magnitude (Vega) of galaxy.
|
| mag_bBulge |
float |
em.opt.B |
|
Absolute rest frame B (Buser B3 filter) magnitude (Vega) of bulge
|
| mag_vBulge |
float |
em.opt.V |
|
Absolute rest frame V (Buser V filter) magnitude (Vega) of bulge
|
| mag_rBulge |
float |
em.opt.R |
|
Absolute rest frame R (Johnson R filter) magnitude (Vega) of bulge
|
| mag_iBulge |
float |
em.opt.I |
|
Absolute rest frame I (Johnson I filter) magnitude (Vega) of bulge
|
| mag_kBulge |
float |
em.opt |
|
Absolute rest frame K (Johnson K filter) magnitude (Vega) of bulge
|
| mag_bDust |
float |
em.opt.B |
|
Absolute rest frame B (Buser B3 filter) magnitude (Vega), dust extinction included
|
| mag_vDust |
float |
em.opt.V |
|
Absolute rest frame V (Buser V filter) magnitude (Vega), dust extinction included
|
| mag_rDust |
float |
em.opt.R |
|
Absolute rest frame R (Johnson R filter) magnitude (Vega), dust extinction included
|
| mag_iDust |
float |
em.opt.I |
|
Absolute rest frame I (Johnson I filter) magnitude (Vega), dust extinction included
|
| mag_kDust |
float |
em.opt |
|
Absolute rest frame K (Johnson K filter) magnitude (Vega), dust extinction included
|
| massWeightedAge |
float |
|
109 yr |
The age of this galaxy, weighted by mass of their components. |
| random |
integer |
|
|
Random number between 0 and 1000 (using java.lang.Math.random()).
See the page on random sampling.
|
