Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714234w&link_type=abstract
American Astronomical Society, AAS Meeting #217, #142.34; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We present the results of full radiative transfer simulations of AGN jet cores to study the common physical properties of jets, such as their magnetic field structure and particle properties, that may be responsible for the observed distributions of polarization. To constrain these values we compare the results of our simulations to the first epoch MOJAVE observations of a complete, flux-density limited sample of AGN jets at 15 GHz. A key feature of the observational data is a lack of correlation between observed linear and circular polarization, and we found that this lack of correlation could be reproduced in our simulations if the circular polarization is produced stochastically, likely by Faraday conversion, in a magnetic field dominated by tangled components on a length scale of 1/15 to 1/20 of a jet diameter. The tangled field components must also be shocked to explain the levels of observed linear polarization. We note that other possible explanations exist for the lack of observed correlation between linear and circular polarization, including un-resolved sub-structure and Faraday depolarization in external screens.
This work has been supported by National Science Foundation grants AST-0707693 and AST-0807860.
Homan Daniel C.
Lister Matthew L.
Wotta Christopher B.
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