Image of supernova remnant Kesteven 79 in X-rays obtained with the XMM-Newton telescope. Supernova remnants are hot gas shells in expansion produced by the explosion of a star at the end of its life. Since X-rays are invisible to the human eye, the brightness of the gas in X-rays is represented by the colours blue (2.0-7.0 keV), green (1.2-2.0 keV) and red (0.3-1.2 keV). The three colours image was obtained by merging 15 EPIC MOS observations taken during 2004 and 2009, with a total effective exposure of 380 ks.
The blue source located south of the remnant is the newly discovered transient magnetar 3XMM J185246.6+003317. The blue point source at the centre of the remnant is the CCO (Central Compact Object).
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