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XMMXCS 2215-1738 is a galaxy cluster that lies 10 billion light-years away and has a redshift value of z=1.45. It was discovered by the XMM Cluster Survey in 2006.〔http://www.physorg.com/news68820846.html ''Massive galaxy cluster found 10 billion light years away'' June 6th, 2006, Space & Earth magazine〕 Discovered in 2006, XMMXCS 2215-1738 is one of the most distant galaxy clusters known. It is embedded in intergalactic gas that has a temperature of 10 million degrees.〔http://www.cmu.edu/cmnews/extra/060615_galaxy.html〕 The estimated mass of the cluster is 500 trillion solar masses. The cluster was discovered and studied using the XMM Newton and Keck Telescopes. The cluster is surprisingly large and evolved for a cluster that existed when the universe was only 3 billion years old. Led by University of Sussex researchers, part of the XMM Cluster Survey (XCS) used X-ray Multi Mirror (XMM) Newton satellite to find it, Keck Telescope to determine distance, and used the Hubble Space Telescope to further image it.〔 It contains hundreds of reddish galaxys surrounded by x-ray emitting gas.〔http://www.news.ucdavis.edu/search/news_detail.lasso?id=7769 "Galaxy Cluster Most Distant from Earth Found, June 5, 2006, UC DAVIS〕 It is theorized to have a mass 500 trillion times the mass of the Sun, most of which comes from dark matter.〔〔http://www.highbeam.com/doc/1G1-146854459.html The Journal (Newcastle, England) June 10, 2006〕 The galaxy is called XMMXCS 2215-1734 in many references, with some news sources listing both names. The source of the naming contradiction between XMMXCS 2215-1734 and XMMXCS 2215-1738 is not known. However, XMMXCS 2215-1738 seems to be the more accurate. ==See also== * 2XMM J083026+524133 * galaxy cluster * XMM Newton * XMM Cluster Survey (XCS) * List of the most distant astronomical objects 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「XMMXCS 2215-1738」の詳細全文を読む スポンサード リンク
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