On the Lack of a Soft X-Ray Excess from Galaxy Clusters

Details On the Lack of a Soft X-Ray Excess from Galaxy Clusters On the Lack of a Soft X-Ray Excess from Galaxy Clusters

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.6105l&link_type=abstract

American Astronomical Society Meeting 203, #61.05; Bulletin of the American Astronomical Society, Vol. 35, p.1308

Astronomy and Astrophysics

Astronomy

Scientific paper

A soft X-ray excess has been claimed to exist in and around a number of galaxy clusters and this emission has been attributed to the warm-hot intergalactic medium that may constitute most of the baryons in the local universe. We have examined a study of the XMM-Newton observations by Kaastra et al. (2003) and find that their X-ray excess (or deficit) depends upon Galactic latitude and appears to be related to the surface brightness of the 1/4 keV emission, generally attributed to the Local hot bubble and the halo of the Milky Way. We suggest that the presence of the soft X-ray excess is due to incorrect subtraction of the soft X-ray background. A re-analysis of the observations, using backgrounds matched to the 1/4 keV X-ray background and hydrogen column in the vicinity of the clusters, supports this hypothesis.

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