Bayesian Photometric Redshifts for Weak Lensing Applications

Details Bayesian Photometric Redshifts for Weak Lensing Applications Bayesian Photometric Redshifts for Weak Lensing Applications

2006-07-13

arxiv.org/abs/astro-ph/0607302v2

Mon.Not.Roy.Astron.Soc.371:1693-1704,2006

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures, accepted for publication in MNRAS. Updated contact address

Scientific paper

10.1111/j.1365-2966.2006.10799.x

The next generation of weak gravitational lensing surveys is capable of generating good measurements of cosmological parameters, provided that, amongst other requirements, adequate redshift information is available for the background galaxies that are measured. It is frequently assumed that photometric redshift techniques provide the means to achieve this. Here we compare Bayesian and frequentist approaches to photometric redshift estimation, particularly at faint magnitudes. We identify and discuss the biases that are inherent in the various methods, and describe an optimum Bayesian method for extracting redshift distributions from photometric data.

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