Using CMB lensing to constrain the multiplicative bias of cosmic shear

Autor:	Vallinotto, Alberto
Rok vydání:	2011
Předmět:	Astrophysics - Cosmology and Extragalactic Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics
Zdroj:	Astrophys.J.759:32,2012
Druh dokumentu:	Working Paper
DOI:	10.1088/0004-637X/759/1/32
Popis:	Weak gravitational lensing is one of the key probes of cosmology. Cosmic shear surveys aimed at measuring the distribution of matter in the universe are currently being carried out (Pan-STARRS) or planned for the coming decade (DES, LSST, EUCLID, WFIRST). Crucial to the success of these surveys is the control of systematics. In this work a new method to constrain one such family of systematics, known as multiplicative bias, is proposed. This method exploits the cross-correlation between weak lensing measurements from galaxy surveys and the ones obtained from high resolution CMB experiments. This cross-correlation is shown to have the power to break the degeneracy between the normalization of the matter power spectrum and the multiplicative bias of cosmic shear and to be able to constrain the latter to a few percent. Comment: 5 pages, 1 figure
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1110.5339 Zobrazit plný text záznamu View this record from Arxiv