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 language | English (US) |
|---|---|
| Pages (from-to) | 367-388 |
| Number of pages | 22 |
| Journal | Astrophysical Journal |
| Volume | 690 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2009 |
| Externally published | Yes |
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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 journal › Article
}
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 -