Multiwavelength observations of the γ-ray flaring quasar S4 1030+61 in 2009-2014

被引：19

作者：

Kravchenko, E. V. ^{[1
]}

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

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

Ramakrishnan, V. ^{[3
]}

机构：

[1] Ctr Astro Space, Lebedev Phys Inst, 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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 462卷 / 03期

基金：

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

关键词：

galaxies: active; galaxies: jets; quasars: general; quasars: individual: S4 1030+61; ACTIVE GALACTIC NUCLEI; EXTRAGALACTIC RADIO-SOURCES; FLUX-DENSITY VARIATIONS; FARADAY-ROTATION MEASURES; BL LACERTAE OBJECTS; MAGNETIC-FIELDS; BRIGHTNESS TEMPERATURE; LORENTZ FACTORS; VIEWING ANGLES; CORE-SHIFT;

D O I：

10.1093/mnras/stw1776

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a study of the parsec-scale multifrequency properties of the quasar S4 1030+61 during a prolonged radio and gamma-ray activity. Observations were performed within Fermi gamma-ray telescope, Owens Valley Radio Observatory 40-m telescope and MOJAVE Very Long Baseline Array (VLBA) monitoring programmes, covering five years from 2009. The data are supplemented by four-epoch VLBA observations at 5, 8, 15, 24 and 43 GHz, which were triggered by the bright gamma-ray flare, registered in the quasar in 2010. The S4 1030+61 jet exhibits an apparent superluminal velocity of (6.4 +/- 0.4)c and does not show ejections of new components in the observed period, while decomposition of the radio light curve reveals nine prominent flares. The measured variability parameters of the source show values typical for Fermi-detected quasars. Combined analysis of radio and gamma-ray emission implies a spatial separation between emitting regions at these bands of about 12 pc and locates the gamma-ray emission within a parsec from the central engine. We detected changes in the value and direction of the linear polarization and the Faraday rotation measure. The value of the intrinsic brightness temperature of the core is above the equipartition state, while its value as a function of distance from the core is well approximated by the power law. Altogether these results show that the radio flaring activity of the quasar is accompanied by injection of relativistic particles and energy losses at the jet base, while S4 1030+61 has a stable, straight jet well described by standard conical jet theories.

引用

页码：2747 / 2761

页数：15

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