Galaxy clusters in the swift/burst alert telescope era: Hard X-rays in the intracluster medium

M. Ajello, P. Rebusco, Nico Cappelluti, O. Reimer, H. Böhringer, J. Greiner, N. Gehrels, J. Tueller, A. Moretti

Research output: Contribution to journalArticle

77 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)367-388
Number of pages22
JournalAstrophysical Journal
Volume690
Issue number1
DOIs
StatePublished - Jan 1 2009
Externally publishedYes

Fingerprint

bursts
telescopes
galaxies
x rays
thermal emission
XMM-Newton telescope
newton
radio
magnetic field
distribution functions
luminosity
energy
magnetic fields

Keywords

  • Acceleration of particles
  • Galaxies: clusters: general
  • Magnetic fields
  • Radiation mechanisms: non-thermal
  • X-rays: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Galaxy clusters in the swift/burst alert telescope era : Hard X-rays in the intracluster medium. / Ajello, M.; Rebusco, P.; Cappelluti, Nico; Reimer, O.; Böhringer, H.; Greiner, J.; Gehrels, N.; Tueller, J.; Moretti, A.

In: Astrophysical Journal, Vol. 690, No. 1, 01.01.2009, p. 367-388.

Research output: Contribution to journalArticle

Ajello, M, Rebusco, P, Cappelluti, N, Reimer, O, Böhringer, H, Greiner, J, Gehrels, N, Tueller, J & Moretti, A 2009, 'Galaxy clusters in the swift/burst alert telescope era: Hard X-rays in the intracluster medium', Astrophysical Journal, vol. 690, no. 1, pp. 367-388. https://doi.org/10.1088/0004-637X/690/1/367
Ajello, M. ; Rebusco, P. ; Cappelluti, Nico ; Reimer, O. ; Böhringer, H. ; Greiner, J. ; Gehrels, N. ; Tueller, J. ; Moretti, A. / Galaxy clusters in the swift/burst alert telescope era : Hard X-rays in the intracluster medium. In: Astrophysical Journal. 2009 ; Vol. 690, No. 1. pp. 367-388.
@article{05610863496a44d1aa8fa2b7004edcde,
title = "Galaxy clusters in the swift/burst alert telescope era: Hard X-rays in the intracluster medium",
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.",
keywords = "Acceleration of particles, Galaxies: clusters: general, Magnetic fields, Radiation mechanisms: non-thermal, X-rays: general",
author = "M. Ajello and P. Rebusco and Nico Cappelluti and O. Reimer and H. B{\"o}hringer and J. Greiner and N. Gehrels and J. Tueller and A. Moretti",
year = "2009",
month = "1",
day = "1",
doi = "10.1088/0004-637X/690/1/367",
language = "English (US)",
volume = "690",
pages = "367--388",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Galaxy clusters in the swift/burst alert telescope era

T2 - Hard X-rays in the intracluster medium

AU - Ajello, M.

AU - Rebusco, P.

AU - Cappelluti, Nico

AU - Reimer, O.

AU - Böhringer, H.

AU - Greiner, J.

AU - Gehrels, N.

AU - Tueller, J.

AU - Moretti, A.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - 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.

AB - 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.

KW - Acceleration of particles

KW - Galaxies: clusters: general

KW - Magnetic fields

KW - Radiation mechanisms: non-thermal

KW - X-rays: general

UR - http://www.scopus.com/inward/record.url?scp=65549145612&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65549145612&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/690/1/367

DO - 10.1088/0004-637X/690/1/367

M3 - Article

AN - SCOPUS:65549145612

VL - 690

SP - 367

EP - 388

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -