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XMM-Newton study of soft excess X-ray emission in clusters of galaxies |
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| Authors: | J.S. Kaastra R. Lieu T. Tamura F.B.S. Paerels J.W. den Herder |
| Affiliation: | aSRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands bDepartment of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA cDepartment of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA |
| Abstract: | We discuss the detection of soft excess X-ray emission in a sample of 19 clusters of galaxies observed by XMM-Newton. In 6/19 clusters evidence for a soft X-ray excess is found. Four of these clusters show soft X-ray and O VII line emission from gas with a temperature of 0.2 keV. The centroid of this oxygen line is consistent with the redshift of the cluster. The intensity and spatial extend of the soft excess agrees with previous PSPC measurements. These observations are interpreted as emission from warm-hot intergalactic medium filaments, with density enhancements near the cluster centers, consistent with theoretical predictions. In the other two soft excess clusters a non-thermal origin is consistent with the data. |
| Keywords: | Soft excess X-ray emission Clusters of galaxies XMM-Newton |
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