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.

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)

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Cited by in corpus (8)

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• Evidence of AGN feedback and sloshing in the X-ray luminous NGC 1550 galaxy group
• A critical assessment of the metal content of the ICM
• On the Fe abundance peak formation in cool-core clusters of galaxies: hints from cluster WARPJ1415.1+3612 at z=1.03
• The effect of cluster dynamical state on ram-pressure stripping
• Chasing ICM cooling and AGN feedback from the macro to the meso scales in the galaxy cluster ZwCl 235
• Deprojecting galaxy-cluster cold fronts: evidence for bulk, magnetised spiral flows