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Multi-Epoch VLBA Observations of γ-Ray Bright Blazars

Published online by Cambridge University Press:  12 April 2016

S.G. Marchenko ,
A.P. Marscher ,
J.R. Mattox ,
A.E. Wehrle  and
W. Xu
S.G. Marchenko
Affiliation:
Astronomical Institute, St. Petersburg State University, St. Petersburg 198904, Russia
A.P. Marscher
Affiliation:
Boston University Department of Astronomy, Boston, MA 02215, USA
J.R. Mattox
Affiliation:
Boston University Department of Astronomy, Boston, MA 02215, USA
A.E. Wehrle
Affiliation:
IPAC, JPL/Caltech, 100-22 Caltech, Pasadena, CA 91125, USA
W. Xu
Affiliation:
IPAC, JPL/Caltech, 100-22 Caltech, Pasadena, CA 91125, USA

Abstract

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We have investigated the sub-milliarcsecond scale structure of 41 γ-ray bright blazars with the VLBA at frequencies of 22, 43, and occasionally 8.4 GHz. All of the blazars have dominant, unresolved (less than 0.1 to 0.2 milliarcsec) cores, with the exception of 0954+556, which has no structure apparent on scales less than about 1 milliarcsec. Some have prominent jets, others show only faint secondary components or no non-core structure at all. Apparent velocities have been measured for 13 sources. These range from no detected motion to > 25c.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 67 - 68
Copyright
Copyright © Astronomical Society of the Pacific 1998

References

McGlynn, T.A., et al. 1997. ApJ, 481, 625–632.Google Scholar