Abstract
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.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552) |
| Pages | 559 |
| Volume | 552 |
| Publication status | Published - 2004 |
| MoE publication type | A4 Conference publication |