XMM-Newton discovery of O VII emission from warm gas in clusters of galaxies

J.S. Kaastra , R. Lieu , T. Tamura , F.B.S. Paerels , J.W.A. den Herder

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classification 🌌 astro-ph

keywords clustersemissionbeengalaxieswarmxmm-newtonabundancesattributed

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XMM-Newton recently discovered O VII line emission from ~2 million K gas near the outer parts of several clusters of galaxies. This emission is attributed to the Warm-Hot Intergalactic Medium. The original sample of clusters studied for this purpose has been extended and two more clusters with a soft X-ray excess have been found. We discuss the physical properties of the warm gas, in particular the density, spatial extent, abundances and temperature.

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XMM-Newton discovery of O VII emission from warm gas in clusters of galaxies

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