A Possible Shock Wave in the Intergalactic Medium of the Cluster of Galaxies A754

Details A Possible Shock Wave in the Intergalactic Medium of the Cluster of Galaxies A754 A Possible Shock Wave in the Intergalactic Medium of the Cluster of Galaxies A754

2003-07-04

arxiv.org/abs/astro-ph/0307090v1

Astron.Lett.29:425-428,2003

Astronomy and Astrophysics

Astrophysics

Shortened version of the paper published in Astronomy Letters

Scientific paper

10.1134/1.1589859

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.

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