期刊
ASTROPARTICLE PHYSICS
卷 31, 期 3, 页码 255-259出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2009.02.001
关键词
Galaxy: fundamental parameters; Galaxy: large scale structure
资金
- National Natural Science Foundation of China (NSFC) [10863002]
- Nanchang University
- Alfred P. Sloan Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
Using the volume-limited Main galaxy sample of the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we intend to investigate the difference of the environmental dependence of galaxy properties between red early-types and red late-types. We measure the local three-dimensional galaxy density in a comoving sphere with a radius of the distance to the 5th nearest galaxy for each galaxy, construct two subsamples at both extremes of density for each sample, and compare the luminosity, g-r color and concentration index ci distributions in the lowest density regime with those in the densest regime. It is found that only in the luminosity range M(r) <= -21.95 red early-type galaxies show the significant environmental dependence of luminosity, while in the red late-type sample the galaxy luminosity is nearly independent of environment. We note that the correlation between g-r color and environment for red late-types is much stronger than the one for red early-types, and that the strong environmental dependence of concentration index for red early-types and red late-types does not exist. We also measured the projected local density Sigma(5) which is computed from the distance to the 5th nearest neighbor within a redshift slice +/- 1000 km s(-1) of each galaxy, and get the nearly same conclusions as the three-dimensional density. But the weak environmental dependence of luminosity and g-r color for red early-types, and concentration index for red late-types should be accepted with caution. (C) 2009 Elsevier B.V. All rights reserved.
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