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The Infrared Spectra of Quasars - A Luminosity Dependence

Published online by Cambridge University Press:  19 July 2016

Beverley J. Wills
Beverley J. Wills*
Affiliation:
McDonald Observatory and Department of Astronomy, University of Texas, RLM 15.308 Austin, Texas 78712 U.S.A.

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The IR-optical-UV continua of quasars are often represented by two components: (i) a flat spectrum component dominating in the optical-UV (the “Big Bump”) and sometimes attributed to thermal radiation from an accretion disk with temperatures of about 20000 to 40000 K - we will call it the “disk” component - and (ii) a near IR component characterized by a steep rise, α ∼ 1 for λ > 1 μm, often thought to be a synchrotron spectrum - an extrapolation of the cm or mm wavelength radio spectrum - although some have preferred an explanation in terms of thermal re-radiation of the ionizing continuum by hot dust (e.g., Hyland and Allen 1982, Neugebauer et al. 1979).

Type
Chapter XI: Quasi-Stellar Objects: Distribution and General Properties
Information
Symposium - International Astronomical Union , Volume 124: Observational Cosmology , 1987 , pp. 665 - 668
Copyright
Copyright © Reidel 1987 

References

Hyland, A.R., and Allen, D.A. 1982, MNRAS, 199, 943.Google Scholar
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Wills, B.J. 1986, Ap. J., submitted.Google Scholar