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The Optical Emission from Gamma-Ray Quasars

Published online by Cambridge University Press:  05 March 2013

M. T. Whiting ,
P. Majewski  and
R. L. Webster
M. T. Whiting
Affiliation:
Department of Astrophysics and Optics, School of Physics, University of New South Wales, Sydney NSW 2052, Australia. mwhiting@phys.unsw.edu.au
P. Majewski
Affiliation:
Astrophysics Group, School of Physics, University of Melbourne, Victoria 3010, Australia
R. L. Webster
Affiliation:
Astrophysics Group, School of Physics, University of Melbourne, Victoria 3010, Australia; rwebster@physics.unimelb.edu.au
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Abstract

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We present photometric observations of six radio-loud quasars that were detected by the COMPTEL gamma-ray telescope. The data encompass seven wavebands in the optical and near infrared. After correction for Galactic extinction, we find a wide range in optical slopes. Two sources are as blue as optically-selected quasars, and are likely to be dominated by the accretion disc emission, while three others show colours consistent with a red synchrotron component. We discuss the properties of the COMPTEL sample of quasars, as well as the implications our observations have for multiwavelength modelling of gamma-ray quasars.

Keywords

galaxies: activequasars: individual (PKS 0208–512, PKS 0506–612, PKS 0528+134, PKS 1622–297, PKS 2230+114, PKS 2251+158)
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 2 , 2003 , pp. 196 - 202
Copyright
Copyright © Astronomical Society of Australia 2003

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