The clustering of galaxies at z~0.5 in the SDSS-III Data Release 9 BOSS-CMASS sample: a test for the LCDM cosmology

Details The clustering of galaxies at z~0.5 in the SDSS-III Data Release 9 BOSS-CMASS sample: a test for the LCDM cosmology The clustering of galaxies at z~0.5 in the SDSS-III Data Release 9 BOSS-CMASS sample: a test for the LCDM cosmology

2012-02-27

arxiv.org/abs/1202.6057v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17 pages, 16 Figures. Tables and covariance matrices will be published in the next paper replacement. Submitted to MNRAS

Scientific paper

We present results on the clustering of 282,068 galaxies in the Baryon Oscillation Spectroscopic Survey (BOSS) sample of massive galaxies with redshifts 0.4 ~1e14 M_sun/h. Using the MultiDark simulation we also study the scale-dependent galaxy bias b and find that b~2 for BOSS galaxies at scales > ~10 Mpc/h. The large-scale bias, defined using the extrapolated linear matter power spectrum, depends on the maximum circular velocity of galaxies as b=1+(V_max/(361 km/s))^4/3, or on the galaxy number density as b=0.0377-0.57*log(n_g/(h/Mpc)^3). The damping of the BAO signal produced by non-linear evolution leads to ~2-4% dips in the large-scale bias factor defined in this way. Very accurate fits as a function of abundance and maximum circular velocity of galaxies are provided.

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