XMM-Newton Proposal 02022104

Details XMM-Newton Proposal 02022104 XMM-Newton Proposal 02022104

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003xmm..prop..119b&link_type=abstract

XMM-Newton Proposal ID #02022104

Physics

1Rxs1449, 1Rxs1449, Pks0405-1219, Pks0405-1219, Xmm-Newton Proposal 02022104

Scientific paper

Where, and in what form, are most of the Baryons in the local universe? At high redshift we seem to know the answer, but a substantial fraction of the baryons seem to be missing at low redshift! It is very likely that this material resides in the haloes of galaxies and galaxy groups, at densities and temperatures that make it hard to detect by conventional means. This material should be detectable through the OVII and OVIII absorption of a background source. However, we argue that observation of random sight-lines is not effective, and that we must deliberately target lines of sight that pass through the centers of galaxy groups. Although very rare, we have identified two particularly favourable sight-lines that will allow us to detect this important baryon reservoir.

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