Journal Article

A direct limit on the turbulent velocity of the intracluster medium in the core of Abell 1835 from <i>XMM-Newton</i>

J. S. Sanders, A. C. Fabian, R. K. Smith and J. R. Peterson

in Monthly Notices of the Royal Astronomical Society: Letters

Published on behalf of The Royal Astronomical Society

Volume 402, issue 1, pages L11-L15
Published in print February 2010 |
Published online February 2010 | e-ISSN: 1745-3933 | DOI: http://dx.doi.org/10.1111/j.1745-3933.2009.00789.x

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Abstract

We examine deep XMM–Newton Reflection Grating Spectrometer observations of the X-ray luminous galaxy cluster A1835. For the first time in a galaxy cluster, we place direct limits on turbulent broadening of the emission lines. This is possible because the coolest X-ray emitting gas in the cluster, which is responsible for the lines, occupies a small region within the core. The most conservative determination of the 90 per cent upper limit on line-of-sight, non-thermal, velocity broadening is , measured from the emission lines originating within 30 kpc radius. The ratio of turbulent to thermal energy density in the core is therefore less than 13 per cent. There are no emission lines in the spectrum showing evidence for gas below ∼3.5 keV. We examine the quantity of gas as a function of temperature and place a limit of (90 per cent) for gas cooling radiatively below 3.85 keV.

Keywords: galaxies: clusters: individual: Abell 1835; cooling flows; intergalactic medium; X-rays: galaxies

Journal Article.  3569 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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