220 research outputs found
The Cluster Soft Excess: new faces of an old enigma
Until the advent of XMM-Newton, the cluster soft excess (CSE) was the subject
of some controversy due to both data analysis issues and uncertainties with the
soft excess emission mechanism. XMM-Newton observations have finally laid to
rest any doubts as to the existence of the CSE and have also given tantalising
clues as to the nature of its emission mechanism. Here we report on the
analysis of XMM-Newton observations of a number of CSE clusters in an attempt
to improve the analysis and understanding of the CSE. Included as part of the
study is an analysis of the effects of background subtraction, which calls to
question the integrity of the claimed O VII line discovery, though not the soft
excess itself. We also give details of both thermal and non-thermal fits to the
CSE cluster Abell 3112.Comment: Paper presented at the Plenary session of the International Dark
Matter Meeting, Edinburgh, Sept. 2004 (to appear in the Proceedings
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