Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hrxs.confe..17l&link_type=abstract
High Resolution X-ray Spectroscopy: towards XEUS and Con-X, Proceedings of the international workshop held at the Mullard Space
Other
Scientific paper
A review will be presented of the past eleven years of investigation culminating in the XMM-Newton confirmation of the earlier discoveries of soft X-ray and EUV excess emission from clusters of galaxies. At the present stage of the development we secured joint XMM-Newton/ROSAT modeling of the X-ray emission from many clusters, which demonstrates the robustness of the soft excess phenomenon. On the diagnosis efforts, however, we will also show that the recent claims of redshifted O VII detection at the outskirts of some clusters as evidence for a thermal origin of the soft excess at these outer cluster radii are very questionable. The only way to confirm or refute this important claim, and to identify the correct interpretation of clusters' soft excess in general, is by high (spatial and spectral) resolution spectroscopy. The WMAP Q, V, and W band radial profiles of temperature deviation of the CMB were constructed for a sample of 31 randomly selected nearby clusters of galaxies in directions of Galactic latitude |b| > 30 degrees. The profiles were compared in detail with the expected CMB Sunyaev-Zel'dovich effect (SZE) caused by these clusters, with the hot gas properties of each cluster obtained directly from X-ray observations, and with the WMAP point spread function fully taken into consideration. While the WMAP profiles of some clusters do exhibit the SZE, the phenomenon is also noted to be weak or absent from other clusters. A reliable overall assessment can be made using the combined (co-added) datasets of all 31 clusters. The verdict is that the observed SZE only accounts for about 1/4 of the expected decrement.
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