Hong Guo
Redshift-space clustering of SDSS galaxies – luminosity dependence, halo occupation distribution, and velocity bias
Guo, Hong; Zheng, Zheng; Zehavi, Idit; Behroozi, Peter S.; Chuang, Chia-Hsun; Comparat, Johan; Favole, Ginevra; Gottloeber, Stefan; Klypin, Anatoly; Prada, Francisco; Weinberg, David H.; Yepes, Gustavo
Authors
Zheng Zheng
Professor Idit Zehavi idit.zehavi@durham.ac.uk
Academic Visitor
Peter S. Behroozi
Chia-Hsun Chuang
Johan Comparat
Ginevra Favole
Stefan Gottloeber
Anatoly Klypin
Francisco Prada
David H. Weinberg
Gustavo Yepes
Abstract
We present the measurements and modelling of the small-to-intermediate scale (∼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.
Citation
Guo, H., Zheng, Z., Zehavi, I., Behroozi, P. S., Chuang, C., Comparat, J., …Yepes, G. (2015). Redshift-space clustering of SDSS galaxies – luminosity dependence, halo occupation distribution, and velocity bias. Monthly Notices of the Royal Astronomical Society, 453(4), 4368-4383. https://doi.org/10.1093/mnras/stv1966
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 21, 2015 |
Online Publication Date | Sep 17, 2015 |
Publication Date | Nov 11, 2015 |
Deposit Date | Feb 18, 2016 |
Publicly Available Date | Feb 19, 2016 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 453 |
Issue | 4 |
Pages | 4368-4383 |
DOI | https://doi.org/10.1093/mnras/stv1966 |
Keywords | Galaxies: distances and redshifts, Galaxies: haloes, Galaxies: statistics, Cosmology: observations, Cosmology: theory, Large-scale structure of Universe. |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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