XMM-Newton Proposal 03066302

Details XMM-Newton Proposal 03066302 XMM-Newton Proposal 03066302

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop..214f&link_type=abstract

XMM-Newton Proposal ID #03066302

Physics

Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Lbqs 1228+1116, Lbqs 1228+1116, Xmm-Newton Proposal 03066302

Scientific paper

The amount of baryons detected at z=0 is only about 20% of that detected at z~3, or calculated from the standard big-bang nucleosynthesis. This missing baryon problem is now one of the most important topics in cosmology. Recent simulations predict that most of the baryons in the present Universe reside in a warm-hot intergalactic medium (WHIM) with temperatures of 10**5-7K, associated with clusters of galaxies. At AO-2, we proposed an observation of a quasar behind the Virgo to detect oxygen absorption lines due to the WHIM associated with the cluster. We marginally detected a redshifted OVIII absorption line. However, the exposure time was not long enough, and the confidence level of the absorption line was 96.4%. Hence, we resubmit this proposal to confirm the absorption line with 5sigma confidence.

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