Galaxy clusters in the Swift/BAT era. II. 10 more clusters detected above 15 keV

M. Ajello, P. Rebusco, Nico Cappelluti, O. Reimer, H. Böhringer, V. La Parola, G. Cusumano

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. Among the newly BAT-discovered clusters there are Bullet, A85, 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 multitemperature thermal model confirming our previous results. For two clusters (Bullet and A3667), 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 3.4×10-12 erg cm-2 s-1 as detected in previous studies. For A3667, the excess emission can be successfully modeled as a hot component (kT ∼ 13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely a thermal origin.

Original languageEnglish (US)
Pages (from-to)1688-1706
Number of pages19
JournalAstrophysical Journal
Volume725
Issue number2
DOIs
StatePublished - Dec 20 2010
Externally publishedYes

Fingerprint

bursts
telescopes
galaxies
erg
spectral analysis
cluster analysis
power law
x rays
XMM-Newton telescope
newton
spectrum analysis

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

Ajello, M., Rebusco, P., Cappelluti, N., Reimer, O., Böhringer, H., Parola, V. L., & Cusumano, G. (2010). Galaxy clusters in the Swift/BAT era. II. 10 more clusters detected above 15 keV. Astrophysical Journal, 725(2), 1688-1706. https://doi.org/10.1088/0004-637X/725/2/1688

Galaxy clusters in the Swift/BAT era. II. 10 more clusters detected above 15 keV. / Ajello, M.; Rebusco, P.; Cappelluti, Nico; Reimer, O.; Böhringer, H.; Parola, V. La; Cusumano, G.

In: Astrophysical Journal, Vol. 725, No. 2, 20.12.2010, p. 1688-1706.

Research output: Contribution to journalArticle

Ajello, M, Rebusco, P, Cappelluti, N, Reimer, O, Böhringer, H, Parola, VL & Cusumano, G 2010, 'Galaxy clusters in the Swift/BAT era. II. 10 more clusters detected above 15 keV', Astrophysical Journal, vol. 725, no. 2, pp. 1688-1706. https://doi.org/10.1088/0004-637X/725/2/1688
Ajello, M. ; Rebusco, P. ; Cappelluti, Nico ; Reimer, O. ; Böhringer, H. ; Parola, V. La ; Cusumano, G. / Galaxy clusters in the Swift/BAT era. II. 10 more clusters detected above 15 keV. In: Astrophysical Journal. 2010 ; Vol. 725, No. 2. pp. 1688-1706.
@article{c108de57cbb249fe929f9947f77e23c9,
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/Burst Alert Telescope (BAT) all-sky survey. Among the newly BAT-discovered clusters there are Bullet, A85, 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 multitemperature thermal model confirming our previous results. For two clusters (Bullet and A3667), 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 3.4×10-12 erg cm-2 s-1 as detected in previous studies. For A3667, the excess emission can be successfully modeled as a hot component (kT ∼ 13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely a thermal origin.",
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 Parola, {V. La} and G. Cusumano",
year = "2010",
month = "12",
day = "20",
doi = "10.1088/0004-637X/725/2/1688",
language = "English (US)",
volume = "725",
pages = "1688--1706",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - Galaxy clusters in the Swift/BAT era. II. 10 more clusters detected above 15 keV

AU - Ajello, M.

AU - Rebusco, P.

AU - Cappelluti, Nico

AU - Reimer, O.

AU - Böhringer, H.

AU - Parola, V. La

AU - Cusumano, G.

PY - 2010/12/20

Y1 - 2010/12/20

N2 - We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. Among the newly BAT-discovered clusters there are Bullet, A85, 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 multitemperature thermal model confirming our previous results. For two clusters (Bullet and A3667), 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 3.4×10-12 erg cm-2 s-1 as detected in previous studies. For A3667, the excess emission can be successfully modeled as a hot component (kT ∼ 13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely a thermal origin.

AB - We report on the discovery of 10 additional galaxy clusters detected in the ongoing Swift/Burst Alert Telescope (BAT) all-sky survey. Among the newly BAT-discovered clusters there are Bullet, A85, 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 multitemperature thermal model confirming our previous results. For two clusters (Bullet and A3667), 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 3.4×10-12 erg cm-2 s-1 as detected in previous studies. For A3667, the excess emission can be successfully modeled as a hot component (kT ∼ 13 keV). We thus conclude that the hard X-ray emission from galaxy clusters (except the Bullet) has most likely a thermal origin.

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=78650084939&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78650084939&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/725/2/1688

DO - 10.1088/0004-637X/725/2/1688

M3 - Article

AN - SCOPUS:78650084939

VL - 725

SP - 1688

EP - 1706

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -