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Title: Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV

Abstract

We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/BAT all-sky survey. Among the newly BAT-discovered clusters there are: Bullet, Abell 85, 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 Abell 3667) 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 3.4 x 10{sup -12} erg cm{sup -2} s{sup -1} as detected in previous studies. For Abell 3667 the excess emission can be successfully modeled as a hot component (kT = {approx}13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely thermal origin.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
992878
Report Number(s):
SLAC-PUB-14264
Journal ID: ISSN 0004-637X; ISSN 1538-4357; arXiv:1009.4699; TRN: US201023%%106
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article
Journal Name:
Astrophys.J.725:1688-1706,2010
Additional Journal Information:
Journal Volume: 725; Journal Issue: 2; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; GALAXY CLUSTERS; ORIGIN; ASTROPHYSICS; Astrophysics,ASTRO, GRQC

Citation Formats

Ajello, M., /SLAC /KIPAC, Menlo Park, Rebusco, P., /KIPAC, Menlo Park, Cappelluti, N., /Garching, Max Planck Inst., MPE /Maryland U., Baltimore County, Reimer, O., /SLAC /Palermo Observ., Boehringer, H., /Garching, Max Planck Inst., MPE, La Parola, V., Cusumano, G., and /Palermo Observ. Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV. United States: N. p., 2010. Web. doi:10.1088/0004-637X/725/2/1688.
Ajello, M., /SLAC /KIPAC, Menlo Park, Rebusco, P., /KIPAC, Menlo Park, Cappelluti, N., /Garching, Max Planck Inst., MPE /Maryland U., Baltimore County, Reimer, O., /SLAC /Palermo Observ., Boehringer, H., /Garching, Max Planck Inst., MPE, La Parola, V., Cusumano, G., & /Palermo Observ. Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV. United States. https://doi.org/10.1088/0004-637X/725/2/1688
Ajello, M., /SLAC /KIPAC, Menlo Park, Rebusco, P., /KIPAC, Menlo Park, Cappelluti, N., /Garching, Max Planck Inst., MPE /Maryland U., Baltimore County, Reimer, O., /SLAC /Palermo Observ., Boehringer, H., /Garching, Max Planck Inst., MPE, La Parola, V., Cusumano, G., and /Palermo Observ. 2010. "Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV". United States. https://doi.org/10.1088/0004-637X/725/2/1688. https://www.osti.gov/servlets/purl/992878.
@article{osti_992878,
title = {Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV},
author = {Ajello, M. and /SLAC /KIPAC, Menlo Park and Rebusco, P. and /KIPAC, Menlo Park and Cappelluti, N. and /Garching, Max Planck Inst., MPE /Maryland U., Baltimore County and Reimer, O. and /SLAC /Palermo Observ. and Boehringer, H. and /Garching, Max Planck Inst., MPE and La Parola, V. and Cusumano, G. and /Palermo Observ.},
abstractNote = {We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/BAT all-sky survey. Among the newly BAT-discovered clusters there are: Bullet, Abell 85, 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 Abell 3667) 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 3.4 x 10{sup -12} erg cm{sup -2} s{sup -1} as detected in previous studies. For Abell 3667 the excess emission can be successfully modeled as a hot component (kT = {approx}13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely thermal origin.},
doi = {10.1088/0004-637X/725/2/1688},
url = {https://www.osti.gov/biblio/992878}, journal = {Astrophys.J.725:1688-1706,2010},
issn = {0004-637X},
number = 2,
volume = 725,
place = {United States},
year = {Wed Oct 27 00:00:00 EDT 2010},
month = {Wed Oct 27 00:00:00 EDT 2010}
}