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X-Ray Emission from Active Galaxies

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X-Ray Astronomy

Part of the book series: NATO Advanced Study Institutes Series ((ASIC,volume 60))

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Abstract

The period since ∿1976 has seen a rapid development in the study of X-ray emission from active galaxies. At that time, based mainly on sources in the third Uhuru (3U) catalogue (Giacconi et al.,1974), only 4 active galaxies had been reliably identified as X-ray emitters (viz. 3C 273, NGC 4151, NGC 5128 and M 87), with the possible association of a 3U source with 4 others (NGC 1275, Cyg A, 3C 390.3 and M 82). By the end of 1978, this number had increased to more than 50, forming a second major class of extragalactic X-ray emitter, comparable in number (and range of luminosity) to the galaxy clusters. Many of these new identifications are from the Ariel V Sky Survey and are based on sources listed in the “2A” catalogue (Cooke et al.,1978a). Other recent additions have come from X-ray observations with the SAS-3, OSO-8 and HEAO-1 satellites, together with the revised and considerably extended Uhuru (4U) catalogue (Forman et al., 1978).

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Author information

Authors and Affiliations

  1. X-Ray Astronomy Group, University of Leicester, UK

    K. A. Pounds

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  1. K. A. Pounds
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Editors and Affiliations

  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass., USA

    Riccardo Giacconi

  2. Laboratorio di Radioastronomia CNR, University of Bologna, Bologna, Italy

    Giancarlo Setti

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© 1980 D. Reidel Publishing Company, Dordrecht, Holland

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Pounds, K.A. (1980). X-Ray Emission from Active Galaxies. In: Giacconi, R., Setti, G. (eds) X-Ray Astronomy. NATO Advanced Study Institutes Series, vol 60. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9088-3_19

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  • DOI: https://doi.org/10.1007/978-94-009-9088-3_19

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-009-9090-6

  • Online ISBN: 978-94-009-9088-3

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