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GALAXY CLUSTERING IN THE COMPLETED SDSS REDSHIFT SURVEY: THE DEPENDENCE ON COLOR AND LUMINOSITY

Idit ZehaviDepartment of Astronomy and CERCA, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, OH 44106, USAZheng ZhengYale Center for Astronomy and Astrophysics, Yale University, New Haven, CT 06520, USADavid H. WeinbergDepartment of Astronomy and CCAPP, Ohio State University, Columbus, OH 43210, USAMichael R. BlantonCenter for Cosmology and Particle Physics, Department of Physics, New York University, New York, NY 10003, USANeta A. BahcallDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08540, USAAndreas A. BerlindDepartment of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USAJ. BrinkmannApache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USAJoshua A. FriemanDepartment of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60615, USAJames E. GunnDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08540, USARobert H. LuptonDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08540, USARobert C. NicholInstitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth P01 2EG, UKWill J. PercivalInstitute of Cosmology and Gravitation, University of Portsmouth, Portsmouth P01 2EG, UKDonald P. SchneiderDepartment of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USARamin SkibbaSteward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85121, USAMichael A. StraussDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08540, USAMax TegmarkDepartment of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USADonald G. YorkDepartment of Astronomy and Astrophysics, The University of Chicago, 5640 S. Ellis Avenue, Chicago, IL 60615, USA

2011en

ABI

Annotatsiya

We measure the luminosity and color dependence of galaxy clustering in the SDSS DR7 main galaxy sample, focusing on the projected correlation function w_p(r_p) of volume-limited samples. We interpret our measurements using halo occupation distribution (HOD) modeling assuming a Lambda-CDM cosmology. The amplitude of w_p(r_p) grows slowly with luminosity for L < L_* and increases sharply at higher luminosities, with bias factor b(>L)=1.06+0.23(L/L_*)^{1.12}. At fixed luminosity, redder galaxies have a stronger and steeper w_p(r_p), a trend that runs steadily from the bluest galaxies to the reddest galaxies. The individual luminosity trends for the red and blue galaxy populations are strikingly different. Blue galaxies show a slow but steady increase of w_p(r_p) with luminosity, at all scales. The large-scale clustering of red galaxies shows little luminosity dependence until a sharp increase at L > 4L_*, but the lowest luminosity red galaxies (0.04-0.25 L_*) show very strong clustering on scales r_p < 2 Mpc/h. Most of the observed trends can be naturally understood within the LCDM+HOD framework. The growth of w_p(r_p) with luminosity reflects an overall shift in the halo mass scale, in particular an increase in the minimum host halo mass Mmin. The mass at which a halo has, on average, one satellite galaxy brighter than L is M_1 ~ 17 Mmin(L) over most of the luminosity range. The growth and steepening of w_p(r_p) for redder galaxies reflects the increasing fraction of galaxies that are satellite systems in high mass halos instead of central systems in low mass halos, a trend that is especially marked at low luminosities. Our extensive measurements, provided in tabular form, will allow detailed tests of theoretical models of galaxy formation, a firm grounding of semi-empirical models of the galaxy population, and new cosmological tests.

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DOI: 10.1088/0004-637x/736/1/59

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