A Gamma-Ray Outburst in the Quasar 4C+21.35 on Milliarcsecond Scale

Details A Gamma-Ray Outburst in the Quasar 4C+21.35 on Milliarcsecond Scale A Gamma-Ray Outburst in the Quasar 4C+21.35 on Milliarcsecond Scale

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21740804j&link_type=abstract

American Astronomical Society, AAS Meeting #217, #408.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyse a strong gamma-ray outburst of the quasar 4C+21.35 that started in the end of September 2009, reached a maximum in June 2010 when the quasar was the brightest source in the gamma-ray sky, and died in 2010 August. We monitor the quasar with the VLBA at 43 GHz, the 13 m telescope of Metsahovi Radio Obs. at 37 GHz, and several optical telescopes that possess photometric and polarimetric capabilities. We have found a statistically significant correlation between the gamma-ray/optical and gamma-ray/radio light curves as well as an increase of linear polarization from <1% to 6.5% during the high gamma-ray state along with a rotation of the optical polarization position angle by 200 degrees. We discuss the observed behavior within the context of a similar pattern reported previously in BL Lac, PKS 1510-089, and 3C 279. Our findings suggest multiple-zone locations of high energy emission in blazar jets that spread from the broad line region to the mm-wave VLBI core.
The research at BU was funded in part by NASA Fermi Guest Investigator grants NNX08AV65G and NNX09AT99G and by NSF grant AST-0907893. The VLBA is an instrument of the National Radio Astronomy Observatory, a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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