Parsec-Scale Circular Polarization Measurements of BL Lac Objects

Details Parsec-Scale Circular Polarization Measurements of BL Lac Objects Parsec-Scale Circular Polarization Measurements of BL Lac Objects

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340..180g&link_type=abstract

Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited

Astronomy and Astrophysics

Astronomy

Scientific paper

We are in the process of performing a circular polarization analysis of 2, 4, and 6 cm VLBA data for a complete sample of 34 1 Jy Northern BL Lac objects based on the method developed by Homan & Wardle (1999). We present here our results to date, for about 70% of the sample. We have detected circular polarization in the core regions of about 20% of these sources at 2 cm and 6 cm. A somewhat higher fraction of sources display detectable circular polarization at 4 cm, ≃ 35%. The degrees of circular polarization are similar to those detected for compact AGN in previous studies, with typical values of a few tenths of percent.

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