The Cross‐Correlation between Galaxies of Different Luminosities and Colors | Zendy

Yu Wang | Zendy; Xiaohu Yang | Zendy; H. J. Mo | Zendy; Frank C. van den Bosch | Zendy

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The Cross‐Correlation between Galaxies of Different Luminosities and Colors

Author(s) -

Yu Wang,

Xiaohu Yang,

H. J. Mo,

Frank C. van den Bosch

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/519245

Subject(s) - astrophysics , physics , galaxy , autocorrelation , luminosity , correlation , correlation function (quantum field theory) , luminosity function , statistics , mathematics , geometry , optoelectronics , dielectric

We study the cross-correlation between galaxies of different luminosities andcolors, using a sample selected from the SDSS Dr 4. Galaxies are divided into 6samples according to luminosity, and each of these samples is divided into redand blue subsamples. Projected auto-correlation and cross-correlation isestimated for these subsample. At projected separations r_p > 1\mpch, allcorrelation functions are roughly parallel, although the correlation amplitudedepends systematically on luminosity and color. On r_p < 1\mpch, the auto- andcross-correlation functions of red galaxies are significantly enhanced relativeto the corresponding power laws obtained on larger scales. Such enhancement isabsent for blue galaxies and in the cross-correlation between red and bluegalaxies. We esimate the relative bias factor on scales r > 1\mpch for eachsubsample using its auto-correlation function and cross-correlation functions.The relative bias factors obtained from different methods are similar. For bluegalaxies the luminosity-dependence of the relative bias is strong over theluminosity range probed (-23.0

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