A Possible Shock Wave in the Intergalactic Medium of the Cluster of Galaxies A754
Astrophysics
2009-11-10 v1
Abstract
The cluster of galaxies A754 undergoes a merger of several large structural units. X-ray observations show a nonequilibrium state of the central part of the cluster, in which a cloud of cold plasma 500 kpc in size was identified amid the hotter cluster gas. The X-ray image of A754 exhibits a brightness discontinuity, which can be interpreted as a shock wave in front of a moving cloud of dense gas. The shock parameters are determined from the jump in intergalactic gas density using the ROSAT image. The estimated Mach number is M=1.71^{+0.45}_{-0.24} at a 68% confidence level.
Cite
@article{arxiv.astro-ph/0307090,
title = {A Possible Shock Wave in the Intergalactic Medium of the Cluster of Galaxies A754},
author = {R. Krivonos and A. Vikhlinin and M. Markevitch and M. Pavlinsky},
journal= {arXiv preprint arXiv:astro-ph/0307090},
year = {2009}
}
Comments
Shortened version of the paper published in Astronomy Letters