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Gamma-Ray Sources Observed by Cos-B

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Galactic Astrophysics and Gamma-Ray Astronomy

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Abstract

The nature of the fine-scale structure in the gamma-ray distribution is not yet disclosed. Considerable debate is going on whether these structures which appear point-like in the data, are mainly diffuse in nature or are genuinely compact objects. Most of the uncertainty is due to the experimental limitations. A status report is presented on the experimental study of the fine-scale structure measured by COS-B in the energy range 50 MeV-5 GeV. All identified gamma-ray sources are discussed: (i) the temporal and spectral characteristics of the radio pulsars PSR053 + 21 and PSR0833–45; (ii) COS-B upper limits on the gamma-ray flux from the binary system Cyg X-3; (iii) the ρ Oph molecular cloud now shown to be resolved in gamma rays as is the case for the Orion complex; (iv) the evidence on the detection of 3C273 in three COS-B observations. The 2CG catalogue of high-energy (point-like) gamma-ray sources contains 25 sources, of which 21 are not yet unambiguously identified. Their average properties are discussed. The error region of the unidentified source 2CG195 + 04 (Geminga) is studied at other wavelengths in greatest detail. This search for a counterpart is summarized, showing the possibility that a nearby (≾ 100 pc) neutron star is the counterpart. In the appendix is presented the cross-correlation method which is applied in the search for gamma-ray sources, as well as the appearances of the sources in the data.

Proceedings of the XVIII General Assembly of the IAU: Galactic Astrophysics and Gamma-Ray Astronomy, held at Patras, Greece, 19 August 1982.

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Authors and Affiliations

  1. Huygens Laboratorium, Cosmic-Ray Working Group, Leiden, The Netherlands

    W. Hermsen

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  1. W. Hermsen
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Editors and Affiliations

  1. Institut für Extraterrestrische Physik, Max-Planck-Institut für Astrophysik, Garching b. München, Germany

    G. E. Morfill

  2. Istituto di Fisica Cosmica e Informatica del Consiglio Nazionale delle Ricerche, Palermo, Italy

    R. Buccheri

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© 1983 D. Reidel Publishing Co., Dordrecht and Boston

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Hermsen, W. (1983). Gamma-Ray Sources Observed by Cos-B. In: Morfill, G.E., Buccheri, R. (eds) Galactic Astrophysics and Gamma-Ray Astronomy. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7208-7_7

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  • DOI: https://doi.org/10.1007/978-94-009-7208-7_7

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