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Last updated on April 20, 2014 at 8:28 EDT
Real colour representation of the sources detected by
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'Real colour' representation of the sources detected by XMM-Newton in the Lockman Hole region.

January 24, 2013
The red, green and blue coding refers respectively to the 0.5-2, 2-4.5 and 4.5-10 keV bands. Several diffuse sources with red colours are X-ray clusters of galaxies already identified by ROSAT data. But XMM-Newton clearly identifies a number of green and blue objects, corresponding to obscured faint sources. Copyright: ESA