Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342210b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #422.10; Bulletin of the American Astronomical Society, Vol. 41, p.242
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of numerical simulations of radio emission from an extragalactic radio jet with helical magnetic fields. In particular, we study the circular and linear polarization emerging from a cylinderical cross-section of the jet to find signatures of the underlying jet magnetic field. Our results agree with those of Gabuzda et al. (2008) who find that a completely ordered helical field will have transverse structure in the emitted circular polarization. We also find that the introduction of even modest random field components dilutes the transverse structure in the emission, making it potentially difficult to observe unless the random field varies on very short length-scales. We also study the linear and circular polarization as functions of optical depth, and we find a potential spectral signature of helical fields: increasing linear polarization with optical depth under certain circumstances.
This work has been supported by National Science Foundation grant 0707693-AST.
Baldwin Charlie
Homan Daniel C.
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