Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 470, Issue 3, Pages 2982-3005Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx1462
Keywords
methods: statistical; galaxies: evolution; galaxies: formation; galaxies: haloes
Categories
Funding
- 973 Program [2015CB857002]
- national science foundation of China [11233005, 11621303, 11522324, 11421303, 11503065]
- NSF [AST-1517528, NSFC-11673015]
- National Aeronautics and Space Administration
- National Science Foundation [AST09-08846]
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1517528] Funding Source: National Science Foundation
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We apply a halo-based group finder to four large redshift surveys, the 2MRS (Two Micron All-Sky Redshift Survey), 6dFGS (Six-degree Field Galaxy Survey), SDSS (Sloan Digital Sky Survey) and 2dFGRS (Two-degree Field Galaxy Redshift Survey), to construct group catalogues in the low-redshift Universe. The group finder is based on that of Yang et al. but with an improved halo mass assignment so that it can be applied uniformly to various redshift surveys of galaxies. Halo masses are assigned to groups according to proxies based on the stellar mass/luminosity of member galaxies. The performances of the group finder in grouping galaxies according to common haloes and in halo mass assignments are tested using realistic mock samples constructed from hydrodynamical simulations and empirical models of galaxy occupation in dark matter haloes. Our group finder finds similar to 94 per cent of the correct true member galaxies for 90-95 per cent of the groups in the mock samples; the halo masses assigned by the group finder are un-biased with respect to the true halo masses, and have a typical uncertainty of similar to 0.2 dex. The properties of group catalogues constructed from the observational samples are described and compared with other similar catalogues in the literature.
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