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Quasars and Active Galactic Nuclei

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Allen’s Astrophysical Quantities

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Abstract

Quasars were discovered in the 1960s when two strong, compact radio sources in the third Cambridge radio survey, 3C273, 3C48, were identified with blue stellar objects [1-3]. Optical spectra revealed strong, broad, redshifted emission lines, suggesting the objects were at large distances and highly luminous. It was soon realized that the majority (%#x25AF; 90%) are radio-quiet [4] and also that they are similar to the lower luminosity active galactic nuclei (AGN) discovered ¯ 20 years earlier [5]. This chapter includes definitions of many names and terms used for the various types of AGN, parameters used to characterize them, examples of optical spectra, etc., and many references to the literature. The aim is to provide a general reference and starting point for further study in many aspects of quasar research. A recent book [6] covers quasar research in more depth.

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  1. Belinda J. Wilkes
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  1. Theoretical Division, Los Alamos National Laboratory MS B288, P.O. Box 1663, Los Alamos, NM, 87545, USA

    Arthur N. Cox

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Wilkes, B.J. (2002). Quasars and Active Galactic Nuclei. In: Cox, A.N. (eds) Allen’s Astrophysical Quantities. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1186-0_24

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