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  • 1
    Electronic Resource
    Electronic Resource
    Cygnus X-1 revisited (1984)
    Springer
    Space science reviews 38 (1984), S. 353-384 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review the X- and gamma-ray observations of Cygnus X-1 and their theoretical interpretations, with emphasis on new developments since the mid-1970's. The overall data base at present is most consistent with the inverse Compton model by hot thermal electrons of T e ∼ 109 K, for the hard X-ray luminosity (10–200 keV). However, the origin of the soft X-rays (≤ 10 keV) in high states and gamma rays (〉 200 keV) remain unsettled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176834
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  • 2
    Electronic Resource
    Electronic Resource
    The project EGRET (energetic gamma-ray experiment telescope) on NASA's Gamma-Ray Observatory GRO (1989)
    Springer
    Space science reviews 49 (1989), S. 69-84 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Gamma Ray Observatory (GRO) is currently planned for a launch from the space shuttle in 1990. After the long hiatus in high-energy gamma-ray astronomy since the end of the COS-B mission in 1982, the Soviet missions Granat and Gamma-1 and the NASA mission GRO will resume observations in the energy range from below 100 keV and extending to above 10 GeV. GRO will carry four instruments designed to cover this range of over five decades in photon energy. It is planned to perform a complete sky survey above 1 MeV in the first year of the GRO mission. Data from this survey will be used to study galactic and extragalactic sources of gamma radiation as well as the galactic and extragalactic diffuse emissions. Additionally, measurements of gamma ray bursts will be performed. The angular and spectral resolution of the GRO instruments is significantly improved with respect to previous experiments. The sensitivity for point sources will be better by an order of magnitude, and the location of strong, high energy sources will be determined to about 0.1°–0.2°. After a brief description of the complement of GRO instruments, a detailed discussion of the high-energy telescope EGRET, its design and scientific objectives, is presented in this review.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173744
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