Abstract
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 analyzed the kinematics of new-born 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 pc to 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
$10^{13}$ 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 $\tau\sim1$ to
$\tau
Original language | English |
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Pages (from-to) | 4478-4493 |
Number of pages | 16 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 468 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2017 |
MoE publication type | A1 Journal article-refereed |
Keywords
- techniques
- interferometric – galaxies
- jets – quasars
- individual
- 3C 273 – gamma-rays
- galaxies – radio continuum
- galaxies
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Metsähovi Radio Observatory
Tammi, J. (Manager)
School of Electrical EngineeringFacility/equipment: Facility