GALAXY CLUSTERS IN THE SWIFT /BURST ALERT TELESCOPE ERA: HARD X-RAYS IN THE INTRACLUSTER MEDIUM
Name
Ajello-2009-GALAXY CLUSTERS IN T.pdf
Size
1.7 MB
Format
Adobe PDF
Checksum (MD5)
e45131888d5501233dc36657f9aaa8ea
Author(s)
Ajello, M.
Rebusco, Paola
Cappelluti, N.
Reimer, O.
Böhringer, H.
Greiner, J.
Gehrels, N.
Tueller, J.
Moretti, A.
Date Issued
January 2009
Journal
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
Abstract
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.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
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.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/0004-637x/690/1/367
