Search For Baryonic Filaments Around Clusters And In Superclusters With Suzaku

Details Search For Baryonic Filaments Around Clusters And In Superclusters With Suzaku Search For Baryonic Filaments Around Clusters And In Superclusters With Suzaku

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0607s&link_type=abstract

American Astronomical Society, HEAD meeting #11, #6.07; Bulletin of the American Astronomical Society, Vol. 41, p.659

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A large part of baryons in the local universe is thought to exist along the large-scale structure as filaments of the intergalactic medium, which is called as warm-hot intergalactic medium (WHIM). Thermal and chemical properties of the WHIM, if observed, would bring us rich information about the structure formation and evolution of the universe.
We performed observations with Suzaku in cluster outskirts and in superclusters where the density of the WHIM is expected to be relatively high. We mainly searched for the WHIM emission through
redshifted OVII and OVIII lines and with excess continuum emission in the soft X-ray band. For the Shapley supercluster, the spectra for the possible filament between A3558 and A3556 showed an excess emission compared with that in the off-filament region. On the other hand, for the Sculptor supercluster, the spectra for the regions
between A2811, A2804 and A2801 indicated no excess emission and were consistent with the background one taken in a nearby sky region. Suzaku also observed outer regions for several clusters, such as A2218, A1413, A2142, A2052, and the Coma cluster. As a result, Suzaku gave fairly tight upper limits for the WHIM emissions based on the constraint on the red-shifted OVII and OVIII emission lines, which corresponded to 200 - 300 times the average baryon density of the universe. We will also discuss about the future prospects of the WHIM search program.

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