Multiple Circular Polarization Outbursts in the QSO 3C 279 at Centimeter Wavelengths

Details Multiple Circular Polarization Outbursts in the QSO 3C 279 at Centimeter Wavelengths Multiple Circular Polarization Outbursts in the QSO 3C 279 at Centimeter Wavelengths

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20923906a&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #239.06; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Using the University of Michigan 26-meter telescope we have followed the variations of 3C 279 at 4.8, 8.0 and 14.5 GHz in all four Stokes parameters since late 2003. A series of small outbursts in total flux density have been accompanied by significant variations in circular polarization (CP = Stokes V) at all three frequencies: at 8.0 and 14.5 GHz the sign of V has remained positive, but at 4.8 GHz V has exhibited both polarities. During 2006, V at 14.5 GHz exhibited a change of 0.4% while V at the two lower frequencies exhibited only small or no change: a signature of self-absorption within the radio-emitting region. VLBA measurements made in late 2005 (Homan et al.; this conference) indicate that although this source contains multiple components, the CP originates in the core (partially self-absorbed) region. The observed behavior of V is consistent with the expectations of mode-conversion models incorporating random magnetic fields (Jones & O'Dell ApJ, 214, 522, 1977), but the sign of V has remained suprisingly stable at the higher frequencies. The high levels of both linear and circular polarization in this source place lower limits on the energy of the radiating electrons in the emitting region. This research was supported in part by the NSF (grant AST-0607523).

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