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
Abstract
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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