Poster abstract details

Measuring Magnification Bias in Photometric Galaxy Surveys
R. Ponce, I. Sevilla, E. Sanchez, J. Sanchez


In this contribution, we analyze how cosmic magnification may be detected in upcoming large photometric galaxy surveys. This effect arises as an enhancement or decrease of galaxy/quasar number counts at very high redshifts due to the magnifying weak lensing effect of intervening matter in the line of sight. It shows up in observations as a correlation or anti-correlation with low redshift galaxies. The size of this correlation is directly related to the galaxy bias and cosmological parameters. We focus on two particular cases: the Dark Energy Survey (DES) that will cover 5000 square degrees and reach i_AB<24 making measurements up to z~1.4 with a photo-z resolution of 0.05(1+z); the Physics of the Accelerating Universe Survey (PAU) at the William Herschel Telescope, which will initially cover 200 square degrees and reach the same depth with a much higher photo-z resolution of 0.0035(1+z). For this, we employ the simulations specifically prepared for both of the surveys and study the most important error contributions in each of the cases.