**Table Description:**

This table is
available for
**ADQL** queries and through the
TAP endpoint.

**Resource Description:**

For a list of **all services and tables** belonging
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resource, see Information on resource 'Bolshoi'

**Resource Reference URL:**
Bolshoi

To cite the **table as such**, we suggest the following
BibTeX entry:

@MISC{vo:bolshoi_FOF, year=2016, title={Bolshoi}, author={Riebe K.}, url={http://gavo.aip.de/tableinfo/bolshoi.FOF}, howpublished={{VO} resource provided by the {AIP} {DaCHS}} }

Extensive documentation is available at https://www.cosmosim.org/. See also: Riebe et al. 2013, The MultiDark Database, AN 334, 691, http://adsabs.harvard.edu/abs/2013AN....334..691R for a description of its predecessor www.multidark.org.

Sorted by DB column index. [Sort alphabetically]

Name | Table Head | Description | Unit | UCD |
---|---|---|---|---|

fofId | fofId | unique id for FOF-group | N/A | meta.id;meta.main |

snapnum | snapnum | number of snapshot; look into redshifts-table to find the corresponding redshift | N/A | time.epoch |

level | level | level of substructure, indicates the different linking lengths | N/A | N/A |

NInFile | NInFile | line number of FOF-group in original catalogue file (= rank in file) | N/A | meta.id |

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

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

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

vx | vx | peculiar velocity, x-component | km/s | phys.veloc;pos.cartesian.x |

vy | vy | peculiar velocity, y-component | km/s | phys.veloc;pos.cartesian.y |

vz | vz | peculiar velocity, z-component | km/s | phys.veloc;pos.cartesian.z |

np | np | number of particles inside the FOF group ('halo') | N/A | meta.number |

mass | mass | total mass of the FOF group | h-1.solMass | phys.mass |

size | size | 'radius' of the FOF group, if it were a sphere, computed based on the volume | h-1.Mpc | phys.size.radius |

disp | disp | dispersion | h-1.Mpc | phys.dispMeasure |

disp_v | disp_v | velocity dispersion | km/s | phys.veloc.dispersion |

delta | delta | overdensity (mass/volume) in terms of mean background density rho_b | N/A | phys.density;arith.ratio |

spin | spin | spin parameter (Gottloeber and Yepes 2007, ApJ 664, 117) | N/A | N/A |

angMom_x | angMom_x | angular momentum, x-component | h-2.solMass.Mpc.km/s | phys.angMomentum;pos.cartesian.x |

angMom_y | angMom_y | angular momentum, y-component | h-2.solMass.Mpc.km/s | phys.angMomentum;pos.cartesian.y |

angMom_z | angMom_z | angular momentum, z-component | h-2.solMass.Mpc.km/s | phys.angMomentum;pos.cartesian.z |

angMom | angMom | absolute value of angular momentum | h-2.solMass.Mpc.km/s | phys.angMomentum |

axis1 | axis1 | major axis of the ellipsoidal shape, not normalized | N/A | N/A |

axis2 | axis2 | intermediate axis of the ellipsoidal shape, not normalized | N/A | N/A |

axis3 | axis3 | minor axis of the ellipsoidal shape, not normalized | N/A | N/A |

axis1_x | axis1_x | direction of major axis, unit eigenvector of the inertia tensor, x-component | N/A | N/A |

axis1_y | axis1_y | direction of major axis, y-component | N/A | N/A |

axis1_z | axis1_z | direction of major axis, z-component | N/A | N/A |

axis2_x | axis2_x | direction of intermediate axis, unit eigenvector of the inertia tensor, x-component | N/A | N/A |

axis2_y | axis2_y | direction of intermediate axis, y-component | N/A | N/A |

axis2_z | axis2_z | direction of intermediate axis, z-component | N/A | N/A |

axis3_x | axis3_x | direction of minor axis, unit eigenvector of the inertia tensor, x-component | N/A | N/A |

axis3_y | axis3_y | direction of minor axis, y-component | N/A | N/A |

axis3_z | axis3_z | direction of minor axis, z-component | N/A | N/A |

ix | ix | spatial index, x-direction | N/A | pos.cartesian.x |

iy | iy | spatial index, y-direction | N/A | pos.cartesian.y |

iz | iz | spatial index, z-direction | N/A | pos.cartesian.z |

phkey | phkey | Peano-Hilbert key | N/A | N/A |

Columns that are parts of indices are marked like this.

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