Journal Article

Feedback through multiple outbursts in the cluster 2A 0335+096

J. S. Sanders, A. C. Fabian and G. B. Taylor

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1449-1459
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14892.x
Feedback through multiple outbursts in the cluster 2A 0335+096

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We examine the core of the X–ray bright galaxy cluster 2A 0335+096 using deep Chandra X–ray imaging and spatially resolved spectroscopy, and include new radio observations. The set of around eight X–ray bright blobs in the core of the cluster, appearing like eggs in a bird's nest, contains multiphase gas from ∼0.5 to 2 keV. The morphology of the coolest X–ray emitting gas at 0.5 keV temperature is similar to the Hα emitting nebula known in this cluster, which surrounds the central galaxy. XMM–Newton grating spectra confirm the presence of material at these temperatures, showing reasonable agreement with Chandra emission measures. On scales of 80 to 250 kpc, there is a low temperature, high metallicity, swirl of intracluster medium as seen in other clusters. In the core, we find evidence for a further three X–ray cavities, in addition to the two previously discovered. Enhancements in 1.5 GHz radio emission are correlated with the X–ray cavities. The total 4PV enthalpy associated with the cavities is around 5 × 1059 erg. This energy would be enough to heat the cooling region for ∼5 × 107 yr. We find a maximum pressure discontinuity of 26 per cent (2σ) across the surface brightness edge to the south–west of the cluster core. This corresponds to an upper limit on the Mach number of the cool core with respect to its surroundings of 0.55.

Keywords: galaxies: clusters: individual: 2A 0335+096; intergalactic medium; X–rays: galaxies

Journal Article.  7197 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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