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EGRET Observations of the Extragalactic Gamma‐Ray Emission
Open accessAbstract
The all-sky survey in high-energy gamma rays ( E > 30 MeV) carried out by EGRET aboard the Compton Gamma Ray Observatory provides a unique opportunity to examine in detail the diffuse gamma-ray emission. The observed diffuse emission has a Galactic component arising from cosmic-ray interactions with the local interstellar gas and radiation, as well as an almost uniformly distributed component that is generally believed to originate outside the Galaxy. Through a careful study and removal of the Galactic diffuse emission, the flux, spectrum, and uniformity of the extragalactic emission are deduced. The analysis indicates that the extragalactic emission is well described by a power-law photon spectrum with an index of -(2.10 ± 0.03) in the 30 MeV to 100 GeV energy range. No large-scale spatial anisotropy or changes in the energy spectrum are observed in the deduced extragalactic emission. The most likely explanation for the origin of this extragalactic high-energy gamma-ray emission is that it arises primarily from unresolved gamma-ray-emitting blazars.
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Fichtel, C. E., Simpson, G. A., & Thompson, D. J. (1978) · The Astrophysical Journal · doi:10.1086/156202 · Cited by 205
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Self-citationBertone, G., & Hooper, D. (2018) · Reviews of Modern Physics · doi:10.1103/revmodphys.90.045002 · Cited by 1,241
New cosmological constraints on primordial black holes
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Metadata
- Authors
- Sreekumar, P., Bertsch, D. L., Dingus, B. L., Esposito, J. A., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kniffen, D. A., Lin, Y. C., Mayer‐Hasselwander, H. A., Michelson, P. F., von Montigny, C., Mucke, A., Mukherjee, R., Nolan, P. L., Pohl, M., Reimer, O., Schneid, E., Stacy, J. G., Stecker, F. W., Thompson, D. J., & Willis, T. D.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1998-02-20
- Volume
- 494
- Issue
- 2
- Pages
- 523-534
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2130314416
- Cited by
- 726
- References
- 1
- FWCI
- 22.12
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Sreekumar, P., Bertsch, D. L., Dingus, B. L., Esposito, J. A., Fichtel, C. E., Hartman, R. C., Hunter, S. D., Kanbach, G., Kniffen, D. A., Lin, Y. C., Mayer‐Hasselwander, H. A., Michelson, P. F., von Montigny, C., Mucke, A., Mukherjee, R., Nolan, P. L., Pohl, M., Reimer, O., Schneid, E., . . . Willis, T. D. (1998). EGRET Observations of the Extragalactic Gamma‐Ray Emission. The Astrophysical Journal. https://doi.org/10.1086/305222
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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