11–13 Apr 2016
Amsterdam
Europe/Zurich timezone

Anisotropic Universe unveiled with new galaxy catalogs

12 Apr 2016, 12:15
20m
Amsterdam

Amsterdam

Speaker

Maciej Bilicki (Leiden University)

Description

Various cosmological studies require wide-angle galaxy catalogs with 3-dimensional information on source positions. Such datasets, when covering a significant fraction of the sky, are particularly useful for cross-correlation techniques allowing to detect signals buried under the noise in auto-correlations. I will present two recently compiled photometric redshift catalogs covering most of the extragalactic sky, which give access to unprecedented angular scales up to redshifts of z~0.4. The two datasets are: 2MASS Photometric Redshift catalog (2MPZ) of 1 million galaxies on 90% of the sky at a median redshift z=0.07, and WISE x SuperCOSMOS catalog of 20 million galaxies on 70% of the sky at a median redshift z=0.2. Their redshift accuracy (respectively dz=0.013 and dz=0.033) is sufficient for the tomographic approach in cosmological correlations, and the large fraction of sky covered enhances the signal-to-noise of such studies. I will discuss some of the applications of the two datasets, including a cross-correlation with the Fermi gamma-ray background for constraints on dark matter annihilation and decay (in collaboration with A Cuoco). Finally I will present possibilities of reaching for greater depths on large angular scales thanks to combining already available and forthcoming datasets such as from WISE, VHS, KiDS, etc.

Primary author

Maciej Bilicki (Leiden University)

Presentation materials