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Searching for Black Holes in Space

The Key Role of X-Ray Observations

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The Physics of Accretion onto Black Holes

Part of the book series: Space Sciences Series of ISSI ((SSSI,volume 49))

Abstract

Although General Relativity had provided the physical basis of black holes, evidence for their existence had to await the Space Era when X-ray observations first directed the attention of astronomers to the unusual binary stars Cygnus X-1 and A0620-00. Subsequently, a number of faint Ariel 5 and Uhuru X-ray sources, mainly at high Galactic latitude, were found to lie close to bright Seyfert galaxies, suggesting the nuclear activity in AGN might also be driven by accretion in the strong gravity of a black hole. Detection of rapid X-ray variability with EXOSAT later confirmed that the accreting object in an AGN is almost certainly a supermassive black hole.

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Correspondence to Ken Pounds .

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© 2013 Springer Science+Business Media Dordrecht

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Pounds, K. (2013). Searching for Black Holes in Space. In: Falanga, M., Belloni, T., Casella, P., Gilfanov, M., Jonker, P., King, A. (eds) The Physics of Accretion onto Black Holes. Space Sciences Series of ISSI, vol 49. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-2227-7_2

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