Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 468, Issue 4, Pages 4478-4493Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx710
Keywords
techniques: interferometric; galaxies: jets; quasars: individual: 3C 273; gamma-rays: galaxies; radio continuum: galaxies
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Funding
- Russian Science Foundation [16-12-10481]
- Academy of Finland [267324, 274477, 284495]
- NASA through the Fermi Guest Investigator Program
- University of Michigan
- National Science Foundation [AST-0607523]
- Russian Foundation for Basic Research (RFBR) [13-02-12103]
- Academy of Finland (AKA) [284495, 284495, 267324] Funding Source: Academy of Finland (AKA)
- Russian Science Foundation [16-12-10481] Funding Source: Russian Science Foundation
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We present a comprehensive 5-43 GHz VLBA study of the blazar 3C 273 initiated after an onset of a strong gamma-ray flare in this source. We have analysed the kinematics of newborn components, light curves and position of the apparent core to pinpoint the location of the gamma-ray emission. Estimated location of the gamma-ray emission zone is close to the jet apex, 2-7 pc upstream from the observed 7 mm core. This is supported by ejection of a new component. The apparent core position was found to be inversely proportional to frequency. The brightness temperature in the 7 mm core reached values up to at least 1013 K during the flare. This supports the dominance of particle energy density over that of magnetic field in the 7 mm core. Particle density increased during the radio flare at the apparent jet base, affecting synchrotron opacity. This manifested itself as an apparent core shuttle along the jet during the 7 mm flare. It is also shown that a region where optical depth decreases from tau similar to 1 to tau << 1 spans over several parsecs along the jet. The jet bulk flow speed estimated at the level of 12c on the basis of time lags between 7 mm light curves of stationary jet features is 1.5 times higher than that derived from very long baseline interferometry apparent kinematics analysis.
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