Effects of biasing on the galaxy power spectrum at large scales

Details Effects of biasing on the galaxy power spectrum at large scales Effects of biasing on the galaxy power spectrum at large scales

2010-06-11

arxiv.org/abs/1006.2343v3

Phys.Rev.D83:103509,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 4 figures. One figure and comments clarifying the linear biasing on small scales and references added. V3 version acc

Scientific paper

10.1103/PhysRevD.83.103509

n this paper we study the effect of biasing on the power spectrum at large scales. We show that even though non-linear biasing does introduce a white noise contribution on large scales, the $P(k)\propto k^n$ behavior of the matter power spectrum on large scales may still be visible and above the white noise for about one decade. We show, that the Kaiser biasing scheme which leads to linear bias of the correlation function on {\em large} scales, also generates a linear bias of the {\rm power spectrum} on rather small scales. This is a consequence of the divergence on small scales of the pure Harrison-Zeldovich spectrum. However, biasing becomes k-dependent when we damp the underlying power spectrum on small scales. We also discuss the effect of biasing on the baryon acoustic oscillations.

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