Header

UZH-Logo

Maintenance Infos

Multi-wavelength strong lensing analyses of baryons and dark matter in galaxy clusters


Sereno, M; Lubini, M; Jetzer, P (2012). Multi-wavelength strong lensing analyses of baryons and dark matter in galaxy clusters. Memorie della Societa Astronomica Italiana, Sup19:294-297.

Abstract

Strong lensing studies can provide detailed mass maps of the inner regions even in dynamically active galaxy clusters. Proper modelling of the intracluster medium can play an important role. We discuss a parametric method which exploits X-ray and optical observations. The mass model accounts separately for cluster-sized dark matter halos, galaxies and the intracluster medium. This gives an unbiased look at each matter component. The method has been applied to AC 114, an irregular X-ray cluster. The dark matter distribution is shifted and rotated with respect to the gas but follows the galaxy density, which hints at its collisionless nature. Despite the dynamical activity, the matter distribution seems to be in agreement with predictions from N-body simulations. A universal cusped profile provides a good description of either the overall or the dark matter distribution and the cluster is not affected by the lensing over-concentration bias, as further stressed by an analysis of the triaxial structure.

Abstract

Strong lensing studies can provide detailed mass maps of the inner regions even in dynamically active galaxy clusters. Proper modelling of the intracluster medium can play an important role. We discuss a parametric method which exploits X-ray and optical observations. The mass model accounts separately for cluster-sized dark matter halos, galaxies and the intracluster medium. This gives an unbiased look at each matter component. The method has been applied to AC 114, an irregular X-ray cluster. The dark matter distribution is shifted and rotated with respect to the gas but follows the galaxy density, which hints at its collisionless nature. Despite the dynamical activity, the matter distribution seems to be in agreement with predictions from N-body simulations. A universal cusped profile provides a good description of either the overall or the dark matter distribution and the cluster is not affected by the lensing over-concentration bias, as further stressed by an analysis of the triaxial structure.

Statistics

Downloads

1 download since deposited on 22 Jan 2013
0 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, not refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:2012
Deposited On:22 Jan 2013 07:52
Last Modified:05 Apr 2016 16:18
Publisher:Società Astronomica Italiana
ISSN:0037-8720
Related URLs:http://sait.oat.ts.astro.it/

Download

Preview Icon on Download
Content: Published Version
Filetype: PDF - Registered users only
Size: 433kB