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
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1.
Emission. of X-Rays as a result of the interaction of a strong gravitational field and matter around the hole.
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2.
Short term variability of the X-Ray yield denoting a small object.
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3.
Mass larger than about 3 M⊙ which would exlude a neutron star.
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Bernacca, P.L., Bianchi, L., Turolla, R. (1979). Observational Traits of Black Holes in the Optical Band. In: Riazuddin (eds) Physics and Contemporary Needs. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3587-0_13
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