VLBA Monitoring of 3C 273 and 3C 279 During INTEGRAL Campaigns

Details VLBA Monitoring of 3C 273 and 3C 279 During INTEGRAL Campaigns VLBA Monitoring of 3C 273 and 3C 279 During INTEGRAL Campaigns

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..559s&link_type=abstract

Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific

Computer Science

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Scientific paper

The gamma-ray blazars 3C 273 and 3C 279 were ob- served with the Very Long Baseline Array (VLBA) over seven epochs during the year 2003 as a part of support- ing observations for two INTEGRAL campaigns targeted on these sources. The VLBA observations were carried out in a full multi-wavelength polarimetric mode yield- ing total and polarized intensity maps at six frequencies ranging from 5 to 86 GHz. The VLBA maps probe the emission of the parsec scale jets in the angular scales of 0.1 - 50 mas, providing information about the dynam- ical state of the jets close to the central engine. As the gamma-ray emission above 100 keV is likely to be jet related, the co-ordinated VLBA observations give a pos- sibility to correlate the gamma-ray flux variations with the structural changes in the jet and, furthermore, with the flux and spectral variations of the individual syn- chrotron emitting components. Possible correlations can help to pinpoint the region where the gamma-ray emis- sion originates, and also establish the source of seed pho- tons for the inverse Compton process. We describe here the VLBA observations and present the first fully cali- brated maps together with a preliminary analysis.

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