A connection between γ-ray and parsec-scale radio flares in the blazar 3C 273

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Lebedev Physical Institute
  • Max Planck Institute for Radio Astronomy

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

Details

Original languageEnglish
Pages (from-to)4478-4493
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume468
Issue number4
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • techniques, interferometric – galaxies, jets – quasars, individual, 3C 273 – gamma-rays, galaxies – radio continuum, galaxies

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