Metal jumps across sloshing cold fronts: the case of A496
Abstract
Cold-fronts in cool-core clusters are thought to be induced by minor mergers and to develop through a sloshing mechanism. While temperature and surface-brightness jumps have been detected and measured in many systems, a detailed characterization of the metal abundance across the discontinuity is only available for a handful of objects. Within the sloshing scenario, we expect the central cool and metal rich gas to be displaced outwards into lower abundance regions, thus generating a metal discontinuity across the front. We analyzed a long (120 ksec) XMM-Newton observation of A496 to study the metal distribution and its correlation with the cold-fronts. We find Fe discontinuities across the two main cold-fronts located ~60 kpc NNW and ~160 kpc South of the peak and a metal excess in the South direction.
Cite
@article{arxiv.1306.1241,
title = {Metal jumps across sloshing cold fronts: the case of A496},
author = {Simona Ghizzardi and Sabrina De Grandi and Silvano Molendi},
journal= {arXiv preprint arXiv:1306.1241},
year = {2015}
}
Comments
4 pages; proceedings of the XMM-Newton Science Workshop: "Galaxy Clusters as Giant Cosmic Laboratories" at ESAC, Madrid, Spain, 21-23 May 2012; accepted for publication in Astronomische Nachrichten (AN)