2008/04/30 by B. Joachimi, P. Schneider · 7 citations
Physics and Astronomy · #COSMIC cancer database #Cosmology #Cosmology and Gravitation Theories #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gravitation #Radio Astronomy Observations and Technology #SIGNAL (programming language) #Shear (geology) #Structure formation #astro-ph
paper · pdf · doi:10.1051/0004-6361:200809971
published as A&A 488, 829-843 (2008) · 17 pages, including 9 figures; new Fig. 6, otherwise minor changes; published in A&A
openalex publication_date 2008/07/17 · arxiv created 2008/10/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Aims. To render cosmic shear an astronomical tool of high precision, it is essential to eliminate systematic effects upon its signal, one of the most significant ones being the intrinsic alignment of galaxies. The alignment in tidal fields that are created by the surrounding matter structure induces correlations between the intrinsic ellipticities of source galaxies, as well as correlations between the gravitational shear and the intrinsic ellipticity. While the former effect is restricted to physically close galaxy pairs and thus relatively easy to control, shear-ellipticity correlations occur for pairs at large separations. Because of the crudeness of current models of intrinsic alignment, we have developed a model-independent, purely geometrical method for removing the contamination of the cosmic shear signal by shear-ellipticity correlations.