期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 453, 期 4, 页码 4368-4383出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1966
关键词
galaxies: distances and redshifts; galaxies: haloes; galaxies: statistics; cosmology: observations; cosmology: theory; large-scale structure of Universe
资金
- 973 Programme [2015CB857003]
- Chinese Academy of Sciences
- NSF [AST-1208891]
- NASA [NNX14AC89G]
- STFC [ST/L00075X/1]
- European Research Council through ERC [DEGAS-259586]
- CWRU ACES+ ADVANCE Opportunity Grant
- Giacconi Fellowship
- Spanish MICINNs Consolider-Ingenio Programme [MultiDark CSD2009-00064]
- MINECO Centro de Excelencia Severo Ochoa Programme [SEV-2012-0249]
- MINECO [AYA2014-60641-C2-1-P]
- MINECO (Spain) [AYA2012-31101, FPA2012-34694]
- Spanish MultiDark Consolider Project [CSD2009-00064]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab, the Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1208891] Funding Source: National Science Foundation
- STFC [ST/L00075X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L00075X/1] Funding Source: researchfish
We present the measurements and modelling of the small-to-intermediate scale (similar to 0.1-25 h(-1) Mpc) projected and three-dimensional redshift-space two-point correlation functions (2PCFs) of local galaxies in the Sloan Digital Sky Survey Data Release 7. We find a clear dependence of galaxy clustering on luminosity in both projected and redshift spaces, generally being stronger for more luminous samples. The measurements are successfully interpreted within the halo occupation distribution (HOD) framework with central and satellite velocity bias parameters to describe galaxy kinematics inside haloes and to model redshift-space distortion effects. In agreement with previous studies, we find that more luminous galaxies reside in more massive haloes. Including the redshift-space 2PCFs helps tighten the HOD constraints. Moreover, we find that luminous central galaxies are not at rest at the halo centres, with the velocity dispersion about 30 per cent that of the dark matter. Such a relative motion may reflect the consequence of galaxy and halo mergers, and we find that central galaxies in lower mass haloes tend to be more relaxed with respect to their host haloes. The motion of satellite galaxies in luminous samples is consistent with their following that of the dark matter. For faint samples, satellites tends to have slower motion, with velocity dispersion inside haloes about 85 per cent that of the dark matter. We discuss possible applications of the velocity bias constraints on studying galaxy evolution and cosmology. In the appendix, we characterize the distribution of galaxy redshift measurement errors, which is well described by a Gaussian-convolved double exponential distribution.
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