Xmm-newton Discovery of O Vii Emission from Warm Gas in Clusters of Galaxies
نویسنده
چکیده
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.
منابع مشابه
XMM - Newton confirmation of Soft X - ray excess emission in clusters of galaxies – the discovery of O VII emission from an extended warm baryonic component
We investigate a sample of 14 clusters of galaxies observed with XMM-Newton in a search for soft X-ray excess emission. In five of these clusters a significant soft excess is evident. This soft X-ray excess is compared with the thermal emission from both the hot intracluster gas and any cooling (flow) gas that may be present. A warm (kT =0.2 keV), extended (several Mpc), plasma component is par...
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