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XMM-Newton Probes Formation Of Galaxy Clusters

Date:
September 6, 2005
Source:
European Space Agency
Summary:
ESA's X-ray observatory, XMM-Newton, has for the first time allowed scientists to study in detail the formation history of galaxy clusters, not only with single arbitrarily selected objects, but with a complete representative sample of clusters. Knowing how these massive objects formed is a key to understanding the past and future of the Universe.

This X-ray image shows the cluster RXCJ0658.5-5556, a violently merging cluster. The dark blue region near the centre is the core of a sub-cluster flying through the main cluster body at high ‘supersonic’ speed, as indicated by a mach cone in front of this region. This sub-cluster had a pronounced low entropy core region that so far survived and is still visible. In front of the bow shock region (to the right of the blue region) we see a very dramatic entropy enhancement marked by an arrow which is the cluster gas heated by the shock front caused by the fast flying sub-cluster ‘bullet’. This is the first direct X-ray evidence of shock heating in merging clusters.
Credit: ESA


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The above story is based on materials provided by European Space Agency. Note: Materials may be edited for content and length.


Cite This Page:

European Space Agency. "XMM-Newton Probes Formation Of Galaxy Clusters." ScienceDaily. ScienceDaily, 6 September 2005. <www.sciencedaily.com/releases/2005/09/050906075555.htm>.
European Space Agency. (2005, September 6). XMM-Newton Probes Formation Of Galaxy Clusters. ScienceDaily. Retrieved April 25, 2014 from www.sciencedaily.com/releases/2005/09/050906075555.htm
European Space Agency. "XMM-Newton Probes Formation Of Galaxy Clusters." ScienceDaily. www.sciencedaily.com/releases/2005/09/050906075555.htm (accessed April 25, 2014).

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