Size Bias in Galaxy Surveys

Details Size Bias in Galaxy Surveys Size Bias in Galaxy Surveys

2009-04-29

arxiv.org/abs/0904.4702v3

Phys.Rev.Lett.103:051301,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages; 3 figures. Accepted for publication in Phys. Rev. Let.; v2: incorporating referee's comments; v3: updated acknowledgm

Scientific paper

10.1103/PhysRevLett.103.051301

Only certain galaxies are included in surveys: those bright and large enough to be detectable as extended sources. Because gravitational lensing can make galaxies appear both brighter and larger, the presence of foreground inhomogeneities can scatter galaxies across not only magnitude cuts but also size cuts, changing the statistical properties of the resulting catalog. Here we explore this size bias, and how it combines with magnification bias to affect galaxy statistics. We demonstrate that photometric galaxy samples from current and upcoming surveys can be even more affected by size bias than by magnification bias.

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