Correlated Multiwavelength Polarization Variability in OJ287 and Other Blazars

Details Correlated Multiwavelength Polarization Variability in OJ287 and Other Blazars Correlated Multiwavelength Polarization Variability in OJ287 and Other Blazars

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2002d&link_type=abstract

American Astronomical Society, AAS Meeting #212, #20.02; Bulletin of the American Astronomical Society, Vol. 40, p.217

Astronomy and Astrophysics

Astronomy

Scientific paper

We present evidence for correlation between polarization characteristics at optical wavelengths and in the 43 GHz compact core in a sample of blazars. During intensive 10-day campaigns in October 2005 and March 2006, we obtained highly-sampled measurements of optical photometry and polarimetry, as well as near-simultaneous imaging at 43 GHz at the VLBA. We compare the percentage polarization and electric vector position angle (EVPA) of the unresolved optical emission with polarization characteristics of the resolved parsec-scale jet. In 15 of our 19 objects, rapid variability of EVPA and degree of polarization at optical wavebands is most closely correlated with that found in the compact 43 GHz VLBA core. Additionally, we observe large multiwavelength rotations in EVPA for 8 of our objects. We perform corrections for Faraday rotation on the 43 GHz EVPA measurements of 6 blazars, after which the optical EVPA and radio core EVPA values are consistent within 15 degrees. The conclusion of our study is that the optical emission in the majority of blazars originates in the 43 GHz core. We draw special focus to the objects OJ287 and BL Lac, for which we use the variations in polarization to interpret the mechanisms behind the observed emission. Standing and relativistic shocks, helical and turbulent magnetic fields, and velocity shear are included in our interpretation. This research was funded in part by the National Science Foundation and by the NRAO Student Support Program.

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