Multi-epoch Circular Polarization Of The MOJAVE Sample

Details Multi-epoch Circular Polarization Of The MOJAVE Sample Multi-epoch Circular Polarization Of The MOJAVE Sample

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21731003h&link_type=abstract

American Astronomical Society, AAS Meeting #217, #310.03; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present multi-epoch circular polarization results from the MOJAVE-I sample. MOJAVE stands for Monitoring Of Jets in AGN with VLBA Experiments and is an ongoing program using the NRAO's Very Long Baseline Array (VLBA) to monitor the structure and polarization of a flux-density limited sample of extra-galactic radio jets at 15 GHz. We discuss the variability of circularly polarized emission from the first four years of the MOJAVE monitoring from mid-2002 through the end of 2005, spanning at least four epochs on each of the 133 sources in the original MOJAVE-I sample. Of 50 sources with multi-epoch circular polarization measurements at the >= 2 sigma level, we find only 2 sources that showed a change in observed sign of circular polarization during this time period. We discuss the implications of this apparent sign stability for the jet magnetic field.
This work has been supported by grants from the National Science Foundation (AST-0707693 and AST-0807860) and Research Corporation. The National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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