Journal
ASTROPHYSICAL JOURNAL
Volume 725, Issue 2, Pages 1688-1706Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/725/2/1688
Keywords
acceleration of particles; galaxies: clusters: general; magnetic fields; radiation mechanisms: non-thermal; X-rays: general
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Funding
- MIT
- NASA [NNX07AV03G]
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We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. Among the newly BAT-discovered clusters there are Bullet, A85, Norma, and PKS 0745-19. Norma is the only cluster, among those presented here, which is resolved by BAT. For all the clusters, we perform a detailed spectral analysis using XMM-Newton and Swift/BAT data to investigate the presence of a hard (non-thermal) X-ray excess. We find that in most cases the clusters' emission in the 0.3-200 keV band can be explained by a multi-temperature thermal model confirming our previous results. For two clusters (Bullet and A3667), we find evidence for the presence of a hard X-ray excess. In the case of the Bullet cluster, our analysis confirms the presence of a non-thermal, power-law-like, component with a 20-100 keV flux of 3.4x10(-12) erg cm(-2) s(-1) as detected in previous studies. For A3667, the excess emission can be successfully modeled as a hot component (kT similar to 13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely a thermal origin.
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