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Variable Quasi-Stellar Sources with Particular Emphasis on Objects of the BL Lac Type

Published online by Cambridge University Press:  14 August 2015

T. D. Kinman
T. D. Kinman*
Affiliation:
Kitt Peak National Observatory∗, Tucson, Arizona, U.S.A.

Abstract

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The optically variable quasars tend to have steep optical spectra and to show variable polarization; they tend to be associated with compact radio sources which have flat radio spectra at GHz frequencies. Objects are known which have continuous spectra (like BL Lac and OJ 287), but whose other properties closely parallel those of the variable quasars and N galaxies; in fact no sharp distinction can be drawn between them. The variation in the visibility of emission lines in quasars and N galaxies could be due to variations in the strength and spectral index of the radiation from the non-thermal source and from the differences in the amount and disposition of the material around it; it does not seem unlikely that a combination of these factors accounts for the observed range in emission line strength. The systematic difference in optical spectral index between continuous-spectrum objects (and OVV variables) on the one hand and those with emission lines on the other will produce a difference in K term between them, which may be expected to affect their relative distributions with respect to apparent magnitude.

Type
Part 11 / Variable Quasi-Stellar Objects and Nuclei of Galaxies
Information
Symposium - International Astronomical Union , Volume 67: Variable Stars and Stellar Evolution , 1975 , pp. 571 - 589
Copyright
Copyright © Reidel 1975 

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