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Hard X-Ray Radiation in the Coma Cluster Spectrum
Open accessAbstract
Hard X-ray radiation has been detected for the first time in the Coma Cluster by BeppoSAX . Thanks to the unprecedented sensitivity of the Phoswich Detection System (PDS) instrument, the source has been detected up to ~80 keV. There is clear evidence (4.5 σ) for nonthermal emission in excess of thermal emission above ~25 keV. The hard excess is very unlikely to be the result of X Comae, the Seyfert 1 galaxy that is present in the field of view of the PDS. A hard spectral tail that is due to inverse Compton scattering on cosmic microwave background photons is predicted in clusters, like Coma, with radio halos. Combining the present results with radio observations, a volume-averaged intracluster magnetic field of ~0.15 μG is derived, while the electron energy density of the emitting electrons is ~7 × 10 −14 ergs cm -3 .
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Cited by
Clusters of galaxies: observational properties of the diffuse radio emission
Feretti, L., Giovannini, G., Govoni, F., & Murgia, M. (2012) · The Astronomy and Astrophysics Review · doi:10.1007/s00159-012-0054-z · Cited by 667
Self-citationCOSMIC RAYS IN GALAXY CLUSTERS AND THEIR NONTHERMAL EMISSION
BRUNETTI, G., & JONES, T. W. (2014) · International Journal of Modern Physics D · doi:10.1142/s0218271814300079 · Cited by 577
MAGNETIC FIELDS IN CLUSTERS OF GALAXIES
GOVONI, F., & FERETTI, L. (2004) · International Journal of Modern Physics D · doi:10.1142/s0218271804005080 · Cited by 486
Self-citationCosmological Shock Waves and Their Role in the Large‐Scale Structure of the Universe
Ryu, D., Kang, H., Hallman, E., & Jones, T. W. (2003) · The Astrophysical Journal · doi:10.1086/376723 · Cited by 446
On the Nonthermal Emission and Acceleration of Electrons in Coma and Other Clusters of Galaxies
Petrosian, V. (2001) · The Astrophysical Journal · doi:10.1086/321557 · Cited by 424
Metadata
- Authors
- Fusco-Femiano, R., Dal Fiume, D., Feretti, L., Giovannini, G., Grandi, P., Matt, G., Molendi, S., & Santangelo, A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1999-03-01
- Volume
- 513
- Issue
- 1
- Pages
- L21-L24
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W1975215917
- Cited by
- 260
- References
- 0
- FWCI
- 22.49
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Fusco-Femiano, R., Dal Fiume, D., Feretti, L., Giovannini, G., Grandi, P., Matt, G., Molendi, S., & Santangelo, A. (1999). Hard X-Ray Radiation in the Coma Cluster Spectrum. The Astrophysical Journal. https://doi.org/10.1086/311902
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