Deep X-ray and IR study of the distant X-ray cluster XDCP J0044.0-2033 «Gioiello» at z=1.6

Paolo Tozzi, Joana S. Santos


A recent, deep exposure using NASA’s Chandra X-ray Observatory showed strong diffuse X-ray emission from the high redshift cluster XDCP0044, discovered in 2011 in the framework of the XMM Distant Cluster Project. This is the deepest X-ray observation yet made on a cluster beyond a distance of about 8 billion light years. At the same time, Infrared observations from ESA’s Herschel Space Observatory showed intense star formation in the center of XDCP0044, providing for the first time a snapshot of the epoch when the stars of the most massive cluster members are still forming. The two works originating from these data are led by the authors of this short contribution.

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