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

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A connection between γ-ray and parsec-scale radio flares in the blazar 3C 273. / Lisakov, M.M.; Kovalev, Y. Y.; Savolainen, T.; Hovatta, T.; Kutkin, A.M.

In: Monthly Notices of the Royal Astronomical Society, Vol. 468, No. 4, 2017, p. 4478-4493.

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@article{5c4cabd279ac400c91b29d812f58e19a,
title = "A connection between γ-ray and parsec-scale radio flares in the blazar 3C 273",
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 $\tau", keywords = "techniques, interferometric – galaxies, jets – quasars, individual, 3C 273 – gamma-rays, galaxies – radio continuum, galaxies", author = "M.M. Lisakov and Kovalev, {Y. Y.} and T. Savolainen and T. Hovatta and A.M. Kutkin", year = "2017", doi = "10.1093/mnras/stx710", language = "English", volume = "468", pages = "4478--4493", journal = "Monthly Notices of the Royal Astronomical Society", issn = "0035-8711", number = "4", } ### RIS - Download TY - JOUR T1 - A connection between γ-ray and parsec-scale radio flares in the blazar 3C 273 AU - Lisakov, M.M. AU - Kovalev, Y. Y. AU - Savolainen, T. AU - Hovatta, T. AU - Kutkin, A.M. PY - 2017 Y1 - 2017 N2 - We present a comprehensive 5-43 GHz VLBA study of the blazar 3C 273 initiated after an onset of a strong$\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

AB - 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

KW - techniques

KW - interferometric – galaxies

KW - jets – quasars

KW - individual

KW - 3C 273 – gamma-rays

KW - galaxies – radio continuum

KW - galaxies

U2 - 10.1093/mnras/stx710

DO - 10.1093/mnras/stx710

M3 - Article

VL - 468

SP - 4478

EP - 4493

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -

ID: 13596524