Tracing The Sound Horizon Scale With Photometric Redshift Surveys

Details Tracing The Sound Horizon Scale With Photometric Redshift Surveys Tracing The Sound Horizon Scale With Photometric Redshift Surveys

2010-06-16

arxiv.org/abs/1006.3226v2

Monthly Notices of the Royal Astronomical Society, 411: 277-288 (2011)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 12 figures, published online in MNRAS, 25 October 2010

Scientific paper

10.1111/j.1365-2966.2010.17679.x

We propose a new method for cosmological parameters extraction using the baryon acoustic oscillation scale as a standard ruler in deep galaxy surveys with photometric determination of redshifts. The method consists in a simple empirical parametric fit to the angular 2-point correlation function w(theta). It is parametrized as a power law to describe the continuum plus a Gaussian to describe the BAO bump. The location of the Gaussian is used as the basis for the measurement of the sound horizon scale. This method, although simple, actually provides a robust estimation, since the inclusion of the power law and the use of the Gaussian removes the shifts which affect the local maximum. We discuss the effects of projection bias, non-linearities, redshift space distortions and photo-z precision, and apply our method to a mock catalog of the Dark Energy Survey, built upon a large N-body simulation provided by the MICE collaboration. We discuss the main systematic errors associated to our method and show that they are dominated by the photo-z uncertainty.

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