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Galactic Hard X-Ray Sources viewed by Sigma

  • J. Ballet
  • P. Laurent
  • F. Lebrun
  • J. Paul
  • J. P. Roques
  • P. Mandrou
  • E. Jourdain
  • M. C. Schmitz-Fraysse
  • R. Sunyaev
  • E. Churazov
  • M. Gilfanov
  • A. Finogenov
  • A. Vikhlinin
  • N. Khavenson
  • A. Dyachkov
  • B. Novikov
Part of the Astrophysics and Space Science Library book series (ASSL, volume 187)

Abstract

The SIGMA telescope (35 to 1300 keV) on the GRANAT space observatory has been operating successfully for three years. Thanks to a coded mask, its good angular resolution (15 to 20 arc minutes) allowed to clarify the picture of complex regions particularly around the Galactic Centre. It also eliminates most identification uncertainties.

Two dozen sources, mainly X-ray binaries harbouring either a black hole or a neutron star, have been detected up to April 1993. Nearly all these sources are variable, most strongly so, which attests of their small size and violent nature.

Suspected black hole systems seem to be particularly numerous among the sources emitting above 100 keV, and their spectra appear harder than those of neutron star systems. This amounts to a spectral distinction between the two classes of X-ray binaries. The nature of the companion (high mass or low mass) does not affect this conclusion.

Key words

Hard X-rays coded mask X-ray binaries neutron stars black holes 

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Copyright information

© Springer Science+Business Media Dordrecht 1994

Authors and Affiliations

  • J. Ballet
    • 1
  • P. Laurent
    • 1
  • F. Lebrun
    • 1
  • J. Paul
    • 1
  • J. P. Roques
    • 2
  • P. Mandrou
    • 2
  • E. Jourdain
    • 2
  • M. C. Schmitz-Fraysse
    • 2
  • R. Sunyaev
    • 3
  • E. Churazov
    • 3
  • M. Gilfanov
    • 3
  • A. Finogenov
    • 3
  • A. Vikhlinin
    • 3
  • N. Khavenson
    • 3
  • A. Dyachkov
    • 3
  • B. Novikov
    • 3
  1. 1.DAPNIA/SapGif sur YvetteFrance
  2. 2.CESR-CNRS/UPSToulouseFrance
  3. 3.IKIMoscowRussia

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