Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...617..860m&link_type=abstract
The Astrophysical Journal, Volume 617, Issue 2, pp. 860-866.
Astronomy and Astrophysics
Astronomy
10
Galaxies: Intergalactic Medium, Cosmology: Large-Scale Structure Of Universe, X-Rays: Galaxies: Clusters
Scientific paper
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 O VII 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 the scenario by comparing the observed properties of the CSE with predictions based on models of the WHIM. We find that emission from the WHIM in current models is 3-4 orders of magnitude too faint to explain the CSE. We discuss different possibilities for this discrepancy, including issues of simulation resolution and scale and the role of small density enhancements or galaxy groups. Our final conclusion is that it is unlikely that the WHIM alone is able to account for the observed flux of the CSE.
Bonamente Massimiliano
Cen Renyue
Lieu Richard
Mittaz Jon
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