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Last updated on April 20, 2014 at 14:04 EDT
Composite X-ray and optical image of the high-redshift
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Composite X-ray and optical image of the high-redshift galaxy cluster SPT-CL J2342-5411, with contours depicting the region of the Sunyaev-Zel'dovich effect signature

January 25, 2013
X-ray emission (in pink) along with Sunyaev-Zel'dovich effect (SZE) contours (in white) of the high-redshift galaxy cluster SPT-CL J2342-5411, overlaid on an optical g-, r- and i-band colour composite image. The X-ray observations have been performed using XMM-Newton's new mosaic observing mode. The X-ray emission shown in the image corresponds to the 0.5-2.0 keV band. The SZE contours, from the South Pole Telescope galaxy cluster catalogue, are overlaid on an optical pseudo-colour image from the Blanco Cosmology Survey. The cluster has a mass of about 3x10^14 solar masses, a temperature of about 4.5 keV (= 52 million Kelvin) and is located at redshift z=1.08. This composite image clearly show a large 'Brightest Cluster Galaxy'(BCG) within a few arc seconds from the peak of the X-ray emission; the SZE detection is also coincident with the observation in the other bands. The region depicted above is 4.8 x 4.8 arc minutes.