Cosmic homogeneity demonstrated with luminous red galaxies

被引：204

作者：

Hogg, DW

Eisenstein, DJ

Blanton, MR

Bahcall, NA

Brinkmann, J

Gunn, JE

Schneider, DP

机构：

[1] NYU, Dept Phys, Ctr Cosmol & Particle Phys, New York, NY 10003 USA

[2] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[3] Princeton Univ Observ, Princeton, NJ 08544 USA

[4] Apache Point Observ, Sunspot, NM 88349 USA

[5] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 624卷 / 01期

关键词：

cosmological parameters; cosmology : observations; galaxies : statistics; large-scale structure of universe; methods : statistical; surveys;

D O I：

10.1086/429084

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We test the homogeneity of the universe at z similar to 0.3 with the luminous red galaxy (LRG) spectroscopic sample of the Sloan Digital Sky Survey. First, the mean number N(R) of LRGs within completely surveyed LRG-centered spheres of comoving radius R is shown to be proportional to R-3 at radii greater than R similar to 70 h(-1) Mpc. The test has the virtue that it does not rely on the assumption that the LRG sample has a finite mean density; its results show, however, that there is such a mean density. Second, the survey sky area is divided into 10 disjoint solid angular regions, and the fractional rms density variations of the LRG sample in the redshift range 0.2 < z < 0.35 among these ( similar to 2 x 10(7) h(-3) Mpc(3)) regions is found to be 7% of the mean density. This variance is consistent with typical biased Lambda CDM models and puts very strong constraints on the quality of SDSS photometric calibration.

引用

页码：54 / 58

页数：5

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