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Observational Traits of Black Holes in the Optical Band

  • P. L. Bernacca
  • L. Bianchi
  • R. Turolla

Abstract

A black hole is, still today, only a consequence of the theory of General Relativity. Till the discovery of Pulsars also neutron stars were a theoretical product, in this case of stellar evolution, and a consequence of the stability of superdense bodies. Thirty four years are elapsed between early predictions on their existence made by Zwicky in 1934 and a serious proof of their existence in 1968, when pulsars were discovered. In the case of black holes a convincing evidence, in terms of unambiguous interpretations of observations with a view to current predictions of their observational features, is still missing. The scene is not however discouraging, and at least in one case, Cyg x-1, the basic requirements for the existence of a black hole are satisfied. They are1
  1. 1.

    Emission. of X-Rays as a result of the interaction of a strong gravitational field and matter around the hole.

     
  2. 2.

    Short term variability of the X-Ray yield denoting a small object.

     
  3. 3.

    Mass larger than about 3 M which would exlude a neutron star.

     

Keywords

Black Hole Neutron Star Accretion Disk Accretion Rate Mass Loss Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • P. L. Bernacca
    • 1
  • L. Bianchi
    • 1
  • R. Turolla
    • 1
  1. 1.Asiago Astrophysical ObservatoryThe University of PadovaItaly

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