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BL Lacertae's Compact Variations, 1980–86: A Polarized, Superluminal Challenge

Published online by Cambridge University Press:  03 August 2017

Robert B. Phillips  and
Robert L. Mutel
Robert B. Phillips
Affiliation:
Haystack Observatory, Westford MA 01886
Robert L. Mutel
Affiliation:
The University of Iowa, Iowa City, IA 52242

Extract

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BL Lac shows tightly correlated events in flux density and polarization. When the time scale slows enough for VLBI observations to track them, moving features which mimic piston-driven shocks seem to carry the disturbances. Evidence for BL Lac's shocks may ameliorate the difficulties posed by the excessive incidence of superluminal motion among core objects; superluminal motion may arise from any number of conditions combining shocks and optical depth, not just real jet or real component motions.

Type
Extragalactic
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 103 - 104
Copyright
Copyright © Reidel 1988 

References

Hughes, P.A., Aller, H.D., and Aller, M.F., 1985, Ap.J. 298, 301.Google Scholar
Mutel, R.L., Aller, H.D., and Phillips, R.B., 1981, Nature 249, 236.Google Scholar
Phillips, R.B., and Mutel, R.L., 1982, Ap.J. 257, L19.Google Scholar