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Multi-Waveband Emission Maps of Blazars |
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| Authors: | Alan Marscher Svetlana G Jorstad Valeri M Larionov Margo F Aller Anne Lähteenmäki |
| Institution: | 1. Institute for Astrophysical Research, Boston U., 725 Commonwealth Ave., Boston, MA, 02215, USA 2. Astronomical Institute, St. Petersburg State U., St. Petersburg, Russia 3. Astronomy Department, University of Michigan, Ann Arbor, Michigan, 48109-1042, USA 4. Mets?hovi Radio Observatory at Aalto University, Kylm?l?, Finland |
| Abstract: | We are leading a comprehensive multi-waveband monitoring program of 34 γ-ray bright blazars designed to locate the emission regions of blazars from radio to γ-ray frequencies. The ‘maps’ are anchored by sequences of images in both total and polarized intensity obtained with the VLBA at an angular resolution of ～0.1 milliarcseconds. The time-variable linear polarization at radio to optical wavelengths and radio to γ-ray light curves allow us to specify the locations of flares relative to bright stationary features seen in the images and to infer the geometry of the magnetic field in different regions of the jet. Our data reveal that some flares occur simultaneously at different wavebands and others are only seen at some of the frequencies. The flares are often triggered by a superluminal knot passing through the stationary ‘core’ on the VLBA images. Other flares occur upstream or even parsecs downstream of the core. |
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