The Overdensities of Galaxy Environments as a Function of Luminosity and Color
David W. HoggCenter for Cosmology and Particle Physics, Department of Physics, New York University, 4 Washington Place, New York, NY 10003Michael R. BlantonCenter for Cosmology and Particle Physics, Department of Physics, New York University, 4 Washington Place, New York, NY 10003Daniel J. EisensteinSteward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721James E. GunnPrinceton University Observatory, Peyton Hall, Ivy Lane, Princeton, NJ 08544David J. SchlegelPrinceton University Observatory, Peyton Hall, Ivy Lane, Princeton, NJ 08544Idit ZehaviDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637Neta A. BahcallPrinceton University Observatory, Peyton Hall, Ivy Lane, Princeton, NJ 08544J. BrinkmannApache Point Observatory, 2001 Apache Point Road, P.O. Box 59, Sunspot, NM 88349-0059István CsabaiDepartment of Physics and Astronomy, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218Donald P. SchneiderDepartment of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802David H. WeinbergDepartment of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210Donald G. YorkDepartment of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637
2003en
ABI
Annotatsiya
We study the mean environments of galaxies in the Sloan Digital Sky Survey (SDSS) as a function of rest-frame luminosity and color. Overdensities in galaxy number are estimated in 8 and 1 h(-1) Mpc spheres centered on 115,000 galaxies taken from the SDSS spectroscopic sample. We find that, at constant color, overdensity is independent of luminosity for galaxies with the blue colors of spirals. This suggests that at fixed star formation history, spiral-galaxy mass is a very weak function of environment. Overdensity does depend on luminosity for galaxies with the red colors of early types; both low-luminosity and high-luminosity red galaxies are found to be in highly overdense regions.
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