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Title:
Isothermal shocks in Abell 2199 and 2A 0335+096?
Authors:
Sanders, J. S.; Fabian, A. C.
Affiliation:
AA(Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA; ), AB(Institute of Astronomy, Madingley Road, Cambridge, CB3 0HA; )
Publication:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 371, Issue 1, pp. L65-L69. (MNRAS Homepage)
Publication Date:
09/2006
Origin:
MNRAS
MNRAS Keywords:
cooling flows: galaxies: clusters: individual: Abell 2199: galaxies: clusters: individual: 2A 0335+096: intergalactic medium: X-rays: galaxies, cooling flows, galaxies: clusters: individual: Abell 2199, galaxies: clusters: individual: 2A 0335+096, intergalactic medium, X-rays: galaxies
DOI:
10.1111/j.1745-3933.2006.00209.x
Bibliographic Code:
2006MNRAS.371L..65S

Abstract

We report on a partially circular X-ray surface brightness discontinuity found at about 55 kpc from the centre of Abell 2199 with Chandra X-ray Observatory observations. Unlike cold fronts found in other clusters, the feature shows no significant temperature change across it but has an apparent density jump. We therefore identify it as a weak isothermal shock associated with the central active galactic nucleus and the inflation of its radio bubbles, as found in the Perseus cluster. We examine a similar feature at 40 kpc radius found by Mazzotta et al. in 2A 0335+096, and conclude that it too may be an isothermal shock. The change in density if these are shocks implies a Mach number of ~1.5. If the isothermal nature of these features is confirmed by deeper observations, the implication is that such shocks are common in clusters of galaxies, and are an important mechanism for the transport of energy from a central supermassive black hole into the cluster core.

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