GALAXY CLUSTERS IN THE SWIFT /BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM
Author(s)
Ajello, M.; Rebusco, Paola; Cappelluti, N.; Reimer, O.; Böhringer, H.; Greiner, J.; Gehrels, N.; Tueller, J.; Moretti, A.; ... Show more Show less
DownloadAjello-2009-GALAXY CLUSTERS IN T.pdf (1.697Mb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
We report the detection of 10 clusters of galaxies in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. This sample, which mostly comprises 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., ≥2σ) nonthermal 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 of 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 of the IC mechanism to radio data shows that, in some clusters, the magnetic field might be larger than 0.5 μG. We also derive the first log N-log S and luminosity function distributions of galaxy clusters above 15 keV.
Date issued
2009-01Department
MIT Kavli Institute for Astrophysics and Space ResearchJournal
Astrophysical Journal
Publisher
Institute of Physics/American Astronomical Society
Citation
Ajello, M., P. Rebusco, N. Cappelluti, O. Reimer, H. Böhringer, J. Greiner, N. Gehrels, J. Tueller, and A. Moretti. “ GALAXY CLUSTERS IN THE SWIFT /BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM .” The Astrophysical Journal 690, no. 1 (December 1, 2008): 367–388. © 2008 American Astronomical Society.
Version: Final published version
ISSN
0004-637X
1538-4357