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

被引：53

作者：

Lisakov, M. M. ^{[1
]}

Kovalev, Y. Y. ^{[1
,2
]}

Savolainen, T. ^{[2
,3
,4
]}

Hovatta, T. ^{[3
,4
,5
]}

Kutkin, A. M. ^{[1
]}

机构：

[1] Lebedev Phys Inst, Astro Space Ctr, Profsoyuznaya 84-32, Moscow 117997, Russia

[2] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[3] Aalto Univ, Metsahovi Radio Observ, Metsahovintie 114, FI-02540 Kylmala, Finland

[4] Aalto Univ, Dept Radio Sci & Engn, POB 13000, FI-00076 Aalto, Finland

[5] Univ Turku, Tuorla Observ, Vaaisalantie 20, Piikkio 21500, Finland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 468卷 / 04期

基金：

俄罗斯科学基金会; 俄罗斯基础研究基金会; 芬兰科学院; 美国国家科学基金会;

关键词：

techniques: interferometric; galaxies: jets; quasars: individual: 3C 273; gamma-rays: galaxies; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; LARGE-AREA TELESCOPE; FLUX-DENSITY VARIATIONS; FERMI-DETECTED BLAZARS; LIGHT CURVES; BRIGHTNESS TEMPERATURE; RELATIVISTIC JETS; LORENTZ FACTORS; VIEWING ANGLES; EMISSION;

D O I：

10.1093/mnras/stx710

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：4478 / 4493

页数：16

共 65 条

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