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Frequency Dependence of the Parsec-scale Polarization Structures of BL Lac Objects

Published online by Cambridge University Press:  13 May 2016

A.B. Pushkarev ,
D.C. Gabuzda  and
T.V. Cawthorne
A.B. Pushkarev
Affiliation:
Astro Space Center, Lebedev Physical Institute, Russia
D.C. Gabuzda
Affiliation:
Joint Institute for VLBI in Europe, Holland
T.V. Cawthorne
Affiliation:
Centre for Astrophysics, University of Central Lancashire, UK

Extract

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BL Lacertae objects are active galactic nuclei with weak or undetectable line emission and strong variability in total intensity and linear polarization over a wide wavelength range from optical to radio. The radio emission and much of the optical emission is believed to be synchrotron radiation. Sources in the complete sample of BL Lac objects defined by Kühr and Schmidt (1990) have: 5 GHz fluxes of at least 1 Jy, radio spectral index α ≥ −0.5 (Sv ˜ v+α), rest frame equivalent width of the strongest emission lines less than 5 Å, and optical counterparts on the Sky Survey plates with brightness greater than 20m.

Type
The Inner Regions of Galaxies
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 140 - 141
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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