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  • Articles: DFG German National Licenses  (3)
  • 1985-1989  (3)
Source
  • Articles: DFG German National Licenses  (3)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    On the origin of soft gamma-rays from Cyg X-1 (1985)
    Springer
    Astrophysics and space science 115 (1985), S. 31-37 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A hypothesis is suggested that the observed excess atE≥300 keV in the spectrum of Cyg X-1 has a nonthermal origin and is associated with the development of a relativistic electromagnetic cascade, initiated by accelerated particles in the accretion plasma, surrounding a black hole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653823
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Formation of relativistic electron-photon showers in compact X-ray sources (1985)
    Springer
    Astrophysics and space science 115 (1985), S. 201-225 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibility of relativistic electron-photon shower formation in compact X-ray sources is discussed and the results of Monte-Carlo calculations are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653800
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Model-independent requirements for the source of positrons in the galactic centre (1989)
    Springer
    Space science reviews 49 (1989), S. 55-60 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Model-independent requirements for the positron source in the galactic centre are formulated. From the known physical processes of positron production the most probable seems to be the e + − e − pair production as a result of photon-photon collisions. When certain conditions are satisfied, the efficiency of positron creation due to this mechanism can reach values ≥ 10%, which is comparable with the observed ratio of the annihilation line photon luminosity to the continuum one at E γ 〉 511 keV. Such a situation can be realized: (i) in a thermal pair-dominated mildly relativistic plasma, and (ii) on the development of a nonthermal electromagnetic cascade, initiated by relativistic particles in the field of ambient X-rays. Future gamma-ray observations at ultrahigh energies can be crucial to the choice of the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173742
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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