Scale-Dependent Bias of Galaxies from Baryonic Acoustic Oscillations

Details Scale-Dependent Bias of Galaxies from Baryonic Acoustic Oscillations Scale-Dependent Bias of Galaxies from Baryonic Acoustic Oscillations

2010-09-07

arxiv.org/abs/1009.1393v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 3 figures, submitted to MNRAS

Scientific paper

Baryonic acoustic oscillations (BAOs) modulate the density ratio of baryons to dark matter across large regions of the Universe. We show that the associated variation in the mass-to-light ratio of galaxies should generate an oscillatory, scale-dependent bias of galaxies relative to the underlying distribution of dark matter. A measurement of this effect would calibrate the dependence of the characteristic mass-to-light ratio of galaxies on the baryon mass fraction in their large scale environment. This bias, though, is unlikely to significantly affect measurements of BAO peak positions.

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