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Title:
Thermal continuum from acretion disks in quasars
Authors:
Shields, G. A.
Affiliation:
AA(Texas, University, Austin, Tex.)
Publication:
Nature, vol. 272, Apr. 20, 1978, p. 706-708. NASA-supported research. (Nature Homepage)
Publication Date:
04/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CONTINUOUS SPECTRA, QUASARS, STELLAR MASS ACCRETION, THERMAL EMISSION, SEYFERT GALAXIES
Comment:
A&AA ID. AAA021.141.102
DOI:
10.1038/272706a0
Bibliographic Code:
1978Natur.272..706S

Abstract

It is argued that supermassive accretion in disks may explain the flat optical continuum observed from some QSOs and Seyfert galaxies. With the aid of energy considerations it is shown that a luminous QSO may be powered by accretion onto a black hole with a mass corresponding to that of 100 million solar masses. It is proposed that the blue continuum component of 3C 273 is thermal continuum emission from the inner part of an accretion disk that powers 3C 273. The present model suggests that many QSOs and Seyfert galaxies may show a power law continuum plus thermal emission from the disk at optical or UV frequencies. Many such objects show indeed a flattening or upturn of their continua in the blue. The QSO PHL 957 shows a flat continuum and indications of a cutoff at the highest observed frequencies.
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