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Evidence of Relativistic Beaming in BL Lac-Type Objects

Published online by Cambridge University Press:  04 August 2017

Diana M. Worrall
Diana M. Worrall*
Affiliation:
Center for Astrophysics and Space Sciences University of California, San Diego

Extract

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Multifrequency observations of a variable extragalactic object, when all acquired within the inferred variability time scale of the source, can provide clues to the source's energy mechanisms. A guest observer program with the International Ultraviolet Explorer satellite has provided the focus for such measurements of a few BL Lac-type and related objects at frequencies in the radio, mm, IR, visual and UV. Earlier-epoch X-ray measurements are included in subsequent model fitting. This paper summarizes some of the observations in this program. Synchrotron self-Compton (SSC) models are then applied to the data, leading to the conclusions that the objects are relativistically beamed and that radio emission, at least below a frequency of ~20 GHz, is from a separate source region.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 110: VLBI and Compact Radio Sources , 1984 , pp. 187 - 188
Copyright
Copyright © Reidel 1984 

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