Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543421a&link_type=abstract
American Astronomical Society, AAS Meeting #215, #434.21; Bulletin of the American Astronomical Society, Vol. 42, p.378
Astronomy and Astrophysics
Astronomy
Scientific paper
We have been monitoring the variability in all four Stokes parameters of a sample of bright extragalactic sources at centimeter wavelengths using the University of Michigan 26-meter telescope. The primary goal is to study the range of variability of the circular polarization emitted during outbursts. The low level of instrumental polarization in Stokes V (less than 0.1 percent) is verified by repeated observations of galactic HII regions such as M17 and M42. In the majority of objects studied, circular polarization is only observed as a transient phenomenon with V << 1% and lasting only weeks to months. However, the QSOs 3C 279 and OV-236 have exhibited V as high a 1%, with variability time scales of months to years. The polarity of V has been observed in our source sample to reverse with time, and we have observed simultaneous opposite polarities of V within our frequency range of 5 to 15 GHz. We present light curves and spectra in all 4 Stokes parameters obtained during an 8 year time period for the bright QSOs 3C 279, 3C 345, and OV-236, and for the radio galaxy 3C 84. This work is supported in part by NSF grant AST-0607523 and by funds from the University of Michigan.
Aller Hugh D.
Aller Margo F.
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