3.3.16.1  :  MR7

The database Guo2013a contains three tables, MR7, MRscWMAP7c and MRIIscWMAP7. They store the results of running the L-Galaxies code version described in Guo etal (2013)(ads) on the halo merger stored in tables with the same name in the MPAHaloTrees database. The names also refer to the (scaled) simulations from which they were extracted and which are described here.

The tables all have the same columns shown below. The many different "id"-columns implement pointers that allow one to traverse the merging trees in different ways. For an explanation of how merger trees are represented in these tables see this page.

columntypeUCDunitdescription
galaxyIDbigintmeta.id;meta.main The unique identifier of this galaxy. Built from the topologically sorted merger tree as described in TBD
haloIDbigintmeta.id.parent The haloId of the subhalo (in the halo table with the same name in MPAHaloTrees) containing this galaxy.
TBD add link to more detailed explanation
firstProgenitorIdbigintmeta.id.assoc galaxyId of the first progenitor of this galaxy. Strictly galaxyId+1 iff lastProgenitorId > galaxyId, else -1.
TBD add link to more detailed explanation
nextProgenitorIdbigintmeta.id.assoc galaxyId of next progenitor of this galaxy in the linked list structure used to facilitate traversing trees in code.
TBD add link to more detailed explanation
lastProgenitorIdbigintmeta.id.assoc The galaxyId of the last progenitor of this galaxy in the topological ordering used to assign galaxyId-s as described in this page.
fofCentralIdbigintmeta.id.assocThe galaxy id of the central galaxy of the FOF group this galaxy is in.
treeIdbigintmeta.id.parentUnique id of galaxy formation tree containing this galaxy. Note that this treeId does not identify merger trees but thelarger structures defining galaxy formation units.
The following equalities hold:
For MR and mMR: treeId = 1000000*floor(galaxyId/1000000).
For MRII and mMRII: treeId = 1000000000*floor(galaxyId/1000000000)
descendantIdbigintmeta.id.assocgalaxyId of the descendant of this galaxy in its merger tree.
mainLeafIDbigintmeta.id.assocgalaxyId of the leaf on the main branch this galaxy is part of. Obtained by following firstProgenitorId as far as it goes.
treeRootIDbigintmeta.id.assocThe galaxyId of the galaxy at the root of the merger tree this galaxy is in. Especially useful for speeding up queries for descendants for a given progenitor. See TBD for an example.
subHaloIDbigintmeta.idId of the subhalo containing this galaxy, as given by the column subhaloFileID in the MillenniumII..SubHalo, miniMilII..SubHalo table (for MRII and mMRII), and by the column subhaloId in the MField.FOFSubHalo, millimil..FOFSubHalo tables (for MR and mMR). Alternative to haloId.
fofIDbigintmeta.id.assocThe subhaloId resp. subhaloFileId (for mMR and MR resp. mMRII and MRII, see documentation of subhaloId column in this table) of the subhalo at the center of the FOF group containing this galaxy.
phkeyintThe Peano-Hilbert index of the cell this galaxy is in, in the 2563 grid stored in MField...MField (for Millennium, not yet available for Millennium-II). Or, for mMR, the 83 density field in millimil..MMField
redshiftrealtimeThe redshift corresponding to the snapnum (in MField..Snapshots for mMR and MR, MillenniumII..Snapshots for MRII and mMRII) for this galaxy.
typeintsrc.classType indicating whether galaxy is at center of FOF group (type=0), at center of subhalo that is not at center of its FOF gorup (type=1), or is a setellite that has lost its subhalo (type=2).
snapnuminttime The snapshot number where this galaxy was identified.
This column is a foreign key to the snapnum column in the table in the Snapshots database with the same name as current Guo2012a galaxies table. I.e. Snapshots..MR7, Snapshots..MRscWMAP7 or Snapshots..MRIIscWMAP7
centralMvirrealphys.veloc.dispersion1010 Msun/hThe virial mass (as defined by m_crit200) of the FOF group the galaxy resides in.
xrealpos.cartesian.xMpc/hX-component of position of galaxy.
yrealpos.cartesian.yMpc/hY-component of position of galaxy.
zrealpos.cartesian.zMpc/hZ-component of position of galaxy.
velXrealphys.velockm/sX-component of velocity of galaxy.
velYrealphys.velockm/sY-component of velocity of galaxy.
velZrealphys.velockm/sZ-component of velocity of galaxy.
npintmeta.numberNumber of particles of the subhalo this galaxy is in.
mvirrealphys.mass1010 Msun/hVirial mass of the FOF group this galaxy was in when last it was a type 0 galaxy. I.e. current mass for type 0 galaxies, "infall mass" for type 1,2 galaxies.
rvirrealphys.size.radiusMpc/hVirial radius of the FOF group this galaxy was in when last it was a type 0 galaxy. I.e. current Rvir for type 0 galaxies, "infall rvir" for type 1,2 galaxies
vvirrealphys.velockm/sVirial velocity of the subhalo the galaxy is/was the center of.
vmaxrealphys.veloc.rotatkm/sMaximum rotational velocity of the subhalo of which this galaxy is the center, or the last value for satellite galaxies.
gasSpinXrealphys.veloc.angMpc/h km/sThe X-component of the spin of the cold gas disk
gasSpinYrealphys.veloc.angMpc/h km/sThe X-component of the spin of the cold gas disk
gasSpinZrealphys.veloc.angMpc/h km/sThe X-component of the spin of the cold gas disk
stellarSpinXrealphys.veloc.angMpc/h km/sThe X-component of the spin of the stellar disk
stellarSpinYrealphys.veloc.angMpc/h km/sThe X-component of the spin of the stellar disk
stellarSpinZrealphys.veloc.angMpc/h km/sThe X-component of the spin of the stellar disk
infallVmaxrealphys.veloc.rotatkm/sMaximum rotational velocity of the host halo of this galaxy at infallSnap.
infallSnapinttimeMost recent (largest) snapnum at which this galaxy's type changed from 0 to 1 or 2
hotRadiusrealphys.size.radiusMpc/hRadius out to which hot gas extends: rvir for type 0; 0 for type 2; maximum radius out to which hot gas is not stripped for type 1.
oriMergeTimereal[UCD]1339.77 Gyr Estimated dyniamical friction time when the merger clock is set (in internal units of the code).
mergeTimereal[UCD]1339.77 Gyr Estimated remaining merging time. oriMergeTime - time since the merger clock is set.
coldGasrealphys.mass1010 Msun /hMass in cold gas disk.
stellarMassrealphys.mass1010 Msun /hTotal mass in stars in disk and bulge together.
bulgeMassrealphys.mass1010 Msun /hMass of stars in bulge.
hotGasrealphys.mass1010 Msun /hMass in hot gas.
ejectedMassrealphys.mass1010 Msun /hThe ejected mass component (see de Lucia et al., 2004, MNRAS, Volume 349, 1101-1116).
blackHoleMassrealphys.mass1010 Msun /hMass of central black hole.
icmStellarMassrealphys.mass1010 Msun /hMass in intra-cluster stars
metalsColdGasrealphys.mass1010 Msun /hMass in metals in cold gas.
metalsStellarMassrealphys.mass1010 Msun /hMass in metals in stars.
metalsBulgeMassrealphys.mass1010 Msun /hMass in metals in stars in bulge.
metalsHotGasrealphys.mass1010 Msun /hMass in metals in hot gas.
metalsEjectedMassrealphys.mass1010 Msun /hMass in metals in the ejected mass component.
metalsICMStellarMassrealphys.mass1010 Msun /hMass in metals in intra-cluster stars
sfrrealphys.SFRMsun/yrStar formation rate
sfrBulgerealphys.SFRMsun/yrStar formation rate in bulge.
xrayLumrealem.X-Raylog10(erg/sec)Log10 of X-Ray luminosity in erg/sec
bulgeSizerealphys.size.radiusMpc/hHalf mass radius of bulge
stellarDiskRadiusrealphys.size.radiusMpc/hSize of the stellar disk, 3x the scale length.
gasDiskRadiusrealphys.size.radiusMpc/hSize of the gas disk, 3x the scale length.
disruptionOnint0: galaxy merged onto merger center;
1: galaxy was disrupted before merging onto its descendant, matter went into ICM of merger center
mergeOnint0: merger clock not set yet;
1: type 1 galaxy with baryon mass > halo mass, separate dynamical friction time calculated
2: this galaxy is type 2 and will merge into the merger center in the next snapshot
3: this galaxy is type 1 and will merge into the central galaxy of the main halo in the next snapshot
coolingRadiusrealphys.size.radiusMpc/hThe radius within which the cooling time scale is shorter than the dynamical timescale
u_magrealphot.mag;em.opt.URest frame total absolute magnitudes, SDSS u band.
g_magrealphot.mag;em.opt.BRest frame total absolute magnitude, SDSS g band.
r_magrealphot.mag;em.opt.RRest frame total absolute magnitude, SDSS r band.
i_magrealphot.mag;em.opt.IRest frame total absolute magnitude, SDSS i band.
z_magrealphot.mag;em.optRest frame total absolute magnitude, SDSS z band.
uBulgerealphot.mag;em.opt.URest frame absolute magnitude of bulge, SDSS u band.
gBulgerealphot.mag;em.opt.BRest frame absolute magnitude of bulge, SDSS g band.
rBulgerealphot.mag;em.opt.RRest frame absolute magnitude of bulge, SDSS r band.
iBulgerealphot.mag;em.opt.IRest frame absolute magnitude of bulge, SDSS i band.
zBulgerealphot.mag;em.optRest frame absolute magnitude of bulge, SDSS z band.
uDustrealphot.mag;em.opt.URest frame total absolute magnitude, SDSS u band, dust extinction included.
gDustrealphot.mag;em.opt.BRest frame total absolute magnitude, SDSS g band, dust extinction included.
rDustrealphot.mag;em.opt.RRest frame total absolute magnitude, SDSS r band, dust extinction included.
iDustrealphot.mag;em.opt.IRest frame total absolute magnitude, SDSS i band, dust extinction included.
zDustrealphot.mag;em.optRest frame total absolute magnitude, SDSS z band, dust extinction included.
massweightedAgerealtime.age109yrThe age of this galaxy, weighted by mass of its components.
uICLrealphot.mag;em.opt.URest frame absolute magnitude of ICL, SDSS u band.
gICLrealphot.mag;em.opt.BRest frame absolute magnitude of ICL, SDSS i band
rICLrealphot.mag;em.opt.RRest frame absolute magnitude of ICL, SDSS i band
iICLrealphot.mag;em.opt.IRest frame absolute magnitude of ICL, SDSS i band
zICLrealphot.mag;em.optRest frame absolute magnitude of ICL, SDSS i band