## BigMDPL – Rockstar

#### Description

Rockstar halo catalogue with consistent merger trees

The table data can be extracted using the query interface.

General information on Rockstar tables is also available at Tables – Rockstar.

Please cite this data set using the unique digital object identifier doi:10.17876/cosmosim/bigmdpl/001.

#### Columns

Column | Type | UCD | Unit | Description |
---|---|---|---|---|

dbId | bigint | meta.id meta.main | unique database id for the halo | |

rockstarId | bigint | meta.id meta.main | unique id for the halo, same as in Rockstar catalogue | |

scale | float | time.epoch | scale factor, same as aexp in Redshifts-table | |

desc_scale | float | time.epoch | scale factor of the descendant halo, if there is one | |

descId | bigint | meta.id.assoc | rockstarId of the descendant | |

nprog | int | meta.number | number of progenitors | |

pId | bigint | meta.id.assoc | rockstarId of least massive host halo, -1 if it is a destinct halo | |

upId | bigint | meta.id.assoc | rockstarId of most massive host halo, only different from pid, if halo lies within two or more larger halos | |

desc_pId | bigint | meta.id.assoc | pId of the descendant halo, if applicable | |

phantom | smallint | meta.code | flag for phantom halos, non-zero if the halo is interpolated across timesteps | |

Mvir_SAM | float | phys.mass | h-1.solMass | halo mass, smoothed across accretion history;always greater than the sum of halo masses of contributing progenitors;only for use with selected semi-analytic models |

Mvir | float | phys.mass | h-1.solMass | halo mass (within virial radius) |

Rvir | float | phys.size.radius | h-1.kpc | halo radius (comoving) |

Rs | float | phys.size.radius | h-1.kpc | scale radius (comoving) |

Vrms | float | phys.veloc.dispersion | km/s | velocity dispersion (physical) |

mmp | smallint | flag indicating if the halo is the most massive progenitor or not | ||

lastMM_scale | float | scale factor of the last major merger (mass ratio > 0.3) | ||

Vmax | float | phys.veloc | km/s | maximum circular velocity (physical) |

x | float | pos.cartesian.x | h-1.Mpc | halo position, comoving |

y | float | pos.cartesian.y | h-1.Mpc | halo position, comoving |

z | float | pos.cartesian.z | h-1.Mpc | halo position, comoving |

vx | float | phys.veloc pos.cartesian.x | km/s | halo velocity, physical |

vy | float | phys.veloc pos.cartesian.y | km/s | halo velocity, physical |

vz | float | phys.veloc pos.cartesian.z | km/s | halo velocity, physical |

angMom_x | float | phys.angMomentum pos.cartesian.x | h-2.solMass.Mpc.km/s | halo angular momentum |

angMom_y | float | phys.angMomentum pos.cartesian.y | h-2.solMass.Mpc.km/s | halo angular momentum |

angMom_z | float | phys.angMomentum pos.cartesian.z | h-2.solMass.Mpc.km/s | halo angular momentum |

spin | float | halo spin parameter | ||

breadthFirstId | bigint | meta.id | Id for breadth-first ordering of halos within a tree | |

depthFirstId | bigint | meta.id | Id for depth-first ordering of halos within a tree | |

treeRootId | bigint | meta.id.assoc | rockstarId of the halo at the last timestep in the tree | |

forestId | bigint | meta.id.assoc | rockstarId of forest to which the halo with the given treeRootId belongs | |

origHaloId | bigint | meta.id.cross | original halo Id from halo finder | |

rockstar_snapnum | int | time.epoch | snapshot number (from which the halo originated), subsequent numbers for Rockstar catalogue | |

snapnum | int | time.epoch | snapshot number (from which the halo originated), same as in other halo catalogues | |

nextCoprog_depthFirstId | bigint | meta.id.assoc | depthFirstId of next coprogenitor | |

mainLeaf_depthFirstId | bigint | meta.id.assoc | depthFirstId of last leaf on the main branch | |

lastProg_depthFirstId | bigint | meta.id.assoc | depthFirstId of last progenitor | |

Rs_Klypin | float | phys.size.radius | Scale radius determined using Vmax and Mvir (see Rockstar paper) | |

Mvir_all | float | phys.mass | h-1.solMass | Mass enclosed within the specified overdensity, including unbound particles |

M200b | float | phys.mass | h-1.solMass | Mass enclosed within overdensity 200*rho_b |

M200c | float | phys.mass | h-1.solMass | Mass enclosed within overdensity 200*rho_crit |

M500c | float | phys.mass | h-1.solMass | Mass enclosed within overdensity 500*rho_crit |

M2500c | float | phys.mass | h-1.solMass | Mass enclosed within overdensity 2500*rho_crit |

Xoff | float | pos.distance | h-1.kpc | Offset of density peak from average particle position, comoving |

Voff | float | phys.veloc arith.diff | km/s | Offset of density peak from average particle velocity, comoving |

spin_Bullock | float | Bullock spin parameter (J/(sqrt(2)*GMVR)) | ||

axisratio_2_1 | float | ratio of second largest shape ellipsoid axes to largest shape ellipsoid axis;shapes determined by method in Allgood et al. (2006) | ||

axisratio_3_1 | float | ratio of smallest shape ellipsoid axes to largest shape ellipsoid axis | ||

axis1_x | float | h-1.kpc | coordinate of largest shape ellipsoid axis, comoving | |

axis1_y | float | h-1.kpc | coordinate of largest shape ellipsoid axis, comoving | |

axis1_z | float | h-1.kpc | coordinate of largest shape ellipsoid axis, comoving | |

axisratio_2_1_500c | float | ratio of second largest shape ellipsoid axes to largest shape ellipsoid axis, for particles within overdensity 500*rho_crit | ||

axisratio_3_1_500c | float | ratio of smallest shape ellipsoid axes to largest shape ellipsoid axis, for particles within overdensity 500*rho_crit | ||

axis1_x_500c | float | h-1.kpc | coordinate of largest shape ellipsoid axis, for particles within overdensity 500*rho_crit, comoving | |

axis1_y_500c | float | h-1.kpc | coordinate of largest shape ellipsoid axis, for particles within overdensity 500*rho_crit, comoving | |

axis1_z_500c | float | h-1.kpc | coordinate of largest shape ellipsoid axis, for particles within overdensity 500*rho_crit, comoving | |

T_U | float | phys.energy arith.ratio | ratio of kinetic to potential energies | |

M_pe_Behroozi | float | phys.mass | h-1.solMass | Pseudo-evolution corrected masses (very experimental) |

M_pe_Diemer | float | phys.mass | h-1.solMass | Pseudo-evolution corrected masses (very experimental) |

Rhalfmass | float | phys.radius | h-1.kpc | Radius within which 1/2 of Mvir is enclosed |

Macc | float | phys.mass | h-1.solMass | halo mass at accretion of the halo to its host |

Mpeak | float | phys.mass | h-1.solMass | peak mass over accretion history |

Vacc | float | phys.veloc | km/s | Vmax at accretion |

Vpeak | float | phys.veloc | km/s | peak Vmax over accretion history |

halfmass_scale | float | time.epoch | scale factor at which the most massive progenitor (mmp) reaches 0.5*Mpeak | |

accRate_Inst | float | h-1.solMass/yr | instantaneous halo mass accretion rate | |

accRate_100Myr | float | h-1.solMass/yr | halo mass accretion rate averaged over passt 100 Myr | |

accRate_1Tdyn | float | h-1.solMass/yr | halo mass accretion rate averaged over past 1*virial dynamical time | |

accRate_2Tdyn | float | h-1.solMass/yr | halo mass accretion rate averaged over past 2*virial dynamical time | |

accRate_Mpeak | float | h-1.solMass/yr | growth rate of Mpeak, averaged from current z to z+0.5 | |

Mpeak_scale | float | time.epoch | scale factor at which Mpeak was reached | |

Acc_scale | float | time.epoch | scale factor at which satellites were accreted | |

First_Acc_scale | float | time.epoch | scale factor at which current and former satellites first passed through a larger halo | |

First_Acc_Mvir | float | phys.mass | h-1.solMass | Mvir at First_Acc_scale |

First_Acc_Vmax | float | phys.veloc | km/s | Vmax at First_Acc_scale |

Vmax_Mpeak | float | phys.veloc | km/s | halo Vmax at the scale at which Mpeak was reached |

ix | int | pos.cartesian.x | spatial grid index, x-direction | |

iy | int | pos.cartesian.y | spatial grid index, y-direction | |

iz | int | pos.cartesian.z | spatial grid index, z-direction | |

phkey | int | Peano-Hilbert key index of space-filling curve |