Swift/BAT Discovery of a Cluster of Galaxies at Z=0.4?

Details Swift/BAT Discovery of a Cluster of Galaxies at Z=0.4? Swift/BAT Discovery of a Cluster of Galaxies at Z=0.4?

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0604o&link_type=abstract

American Astronomical Society Meeting 210, #06.04; Bulletin of the American Astronomical Society, Vol. 39, p.101

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Scientific paper

We report the new source, SWIFT J0356.2-3413, detected by the Swift/BAT instrument at a flux of 1.85x10-11 ergs/cm2/sec in 15-200 keV. A 94 ks follow-up observation by the Swift/XRT did not detect any point sources within the BAT error circle, but an extended source. It is most likely to be a cluster of galaxies, because of its high galactic latitude (b = -50 deg). In fact many galaxies are localized right on the position of the X-ray extended source in a DSS optical image (B-band). And there is a cataloged cluster of galaxies, Abell S0403, close to the source position (5 arcmin away). The spectrum of the extended source can be modeled by a thermal emission from a hot plasma with kT 8 keV and the 2-10 keV flux of 4x10-13 ergs/cm2/sec, consistent with a moderate mass cluster of galaxies. Although we have no optical spectroscopy data for the source, according to an iron line fitting, its redshift is found to be 0.37+/-0.04 detected at 2 sigma significance. We find that the temperature is too high to be on the known L-T relation at the redshift. On the other hand, based on the XRT data, there is an indication of a merger, which could cause the high effective temperature. Alternatively the high kT could be due to non-thermal emission. Furthermore the BAT flux exceeds the extrapolation of the thermal emission by almost two orders of magnitude at 40 keV. This also suggests existence of non-thermal emission either from hidden point sources or diffuse sources, such as merges.

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