1202.6057 (S. E. Nuza et al.)

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

S. E. Nuza, A. G. Sanchez, F. Prada, A. Klypin, D. J. Schlegel, S. Gottloeber, A. D. Montero-Dorta, M. Manera, C. K. McBride, A. J. Ross, R. Angulo, M. Blanton, A. Bolton, G. Favole, L. Samushia, F. Montesano, W. Percival, N. Padmanabhan, M. Steinmetz, J. Tinker, R. Skibba, D. Schneider, H. Guo, I. Zehavi, Z. Zheng, D. Bizyaev, O. Malanushenko, V. Malanushenko, A. E. Oravetz, D. J. Oravetz, A. C. Shelden

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.

View original: http://arxiv.org/abs/1202.6057