Whim Emission and the Cluster Soft Excess: A Model Comparison
The confirmation of the cluster soft excess (CSE) by XMM-Newton has rekindled interest as to its origin. The recent detections of CSE emission at large cluster radii together with reports of OVII line emission associated with the CSE has led many authors to conjecture that the CSE is, in fact, a signature of the warm-hot intergalactic medium (WHIM). In this paper we test this scenario by comparing the observed properties of the CSE with predictions based on models of the WHIM. We find that emission from the WHIM is 3 to 4 orders of magnitude too faint to explain the CSE emission. The only possibility is the models if they are missing a large population of small density enhancements or galaxy groups, but this would place have severe ramifications on the baryon budget.
KeywordsMicrowave Stein Emissivity Vicin
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