Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM

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dc.creatorAjello, M.
dc.creatorRebusco, P.
dc.creatorCappelluti, N.
dc.creatorReimer, O.
dc.creatorBoehringer, H.
dc.creatorGreiner, J.
dc.creatorGehrels, N.
dc.creatorTueller, J.
dc.creatorMoretti, A.
dc.date2008-08-30
dc.date.accessioned2026-07-07T12:15:25Z
dc.date.available2026-07-07T12:15:25Z
dc.descriptionWe report about the detection of 10 clusters of galaxies in the ongoing Swift/BAT all-sky survey. This sample, which comprises mostly merging clusters, was serendipitously detected in the 15--55 keV band. We use the BAT sample to investigate the presence of excess hard X-rays above the thermal emission. The BAT clusters do not show significant (e.g. >2 $σ$) non-thermal hard X-ray emission. The only exception is represented by Perseus whose high-energy emission is likely due to NGC 1275. Using XMM-Newton, Swift/XRT, Chandra and BAT data, we are able to produce upper limits on the Inverse Compton (IC) emission mechanism which are in disagreement with most of the previously claimed hard X-ray excesses. The coupling of the X-ray upper limits on the IC mechanism to radio data shows that in some clusters the magnetic field might be larger than 0.5 $μ$G. We also derive the first logN-logS and luminosity function distribution of galaxy clusters above 15 keV.
dc.descriptionAccepted for publication in the Astrophysical Journal. 59 pages, 5 Tables, 21 Figures
dc.identifierhttps://arxiv.org/abs/0809.0006
dc.identifierhttp://arxiv.org/abs/0809.0006
dc.identifierAstrophys.J.690:367-388,2009
dc.identifierdoi:10.1088/0004-637X/690/1/367
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211493
dc.subjectAstrophysics
dc.titleGalaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
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