Connection between Gamma-Ray Variations and Disturbances in the Jets of Blazars

Details Connection between Gamma-Ray Variations and Disturbances in the Jets of Blazars Connection between Gamma-Ray Variations and Disturbances in the Jets of Blazars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21522502j&link_type=abstract

American Astronomical Society, AAS Meeting #215, #225.02; Bulletin of the American Astronomical Society, Vol. 42, p.543

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I present total and polarized intensity images at ultra-high resolution (0.1 milliarcseconds) of a sample of 33 gamma-ray blazars obtained monthly with the Very Long Baseline Array (VLBA) at 43 GHz, starting in Summer 2008 when the Fermi Gamma-Ray Space Telescope began to operate. The VLBA observations determine the flux and polarization of the millimeter-wave core and other components of the jet, as well as the kinematics of bright superluminal knots. I will compare the gamma-ray light curves of the blazars, obtained with the Fermi Large Area Telescope, with flux variations in the core and knots, the times when new knots pass through the core, changes in the flux at millimeter, optical, and X-ray wavelengths, and variations in the optical and millimeter-wave polarization. The results of the analysis show that, for a number of the blazars (e.g. AO 0235+164, 3C 279, and PKS 1510-089), strong gamma-ray activity lasting more than a month can include multiple flares with different durations and amplitudes on time scales of days or weeks. Such events occur as a new superluminal knot propagates down the inner jet, with the most intense gamma-ray flare occurring as the disturbance interacts with the core.
This research is funded in part by NASA through Fermi Guest Investigator grants NNX08AV65G and NNX08AV61G, and Astrophysical Data Analysis Program grant NNX08AJ64G, and by the National Science Foundation through grant AST-0907893.

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