Detecting the Warm-Hot Intergalactic Medium in the Hercules Supercluster

Details Detecting the Warm-Hot Intergalactic Medium in the Hercules Supercluster Detecting the Warm-Hot Intergalactic Medium in the Hercules Supercluster

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..100f&link_type=abstract

XMM-Newton Proposal ID #06525704

Physics

Cosmology, Extragalactic Deep Fields And Area Surveys, Mkn 501, Mkn 501, Mkn 501, Mkn 501

Scientific paper

The "Missing Baryons", in the form of the Warm-Hot Intergalactic Medium (WHIM), represent a fundamental challenge to the current theory, and a detection of the WHIM in X-ray that is generally accepted has remained elusive. Recently, our joint Chandra and XMM observations revealed a WHIM absorption produced by a known large-scale structure (Sculptor Wall) at high significance (4.2-sigma), demonstrating that superstructures are probably the best locations to detect the WHIM. To assess whether this result is typical, we propose an observation of Mkn 501, a blazar located behind the Hercules Supercluster. The combination of the strong flux and the foreground superstructure makes Mkn 501 the most promising target, with a relatively low expense of telescope time (150~ks).

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