Ejection of Double Knots from the Radio Core of PKS 1510-089 during the Strong Gamma-Ray Flares in 2015

被引:15
作者
Park, Jongho [1 ]
Lee, Sang-Sung [2 ,3 ]
Kim, Jae-Young [4 ]
Hodgson, Jeffrey A. [2 ]
Trippe, Sascha [1 ]
Kim, Dae-Won [1 ]
Algaba, Juan-Carlos [1 ,5 ]
Kino, Motoki [6 ,7 ]
Zhao, Guang-Yao [2 ]
Lee, Jee Won [2 ]
Gurwell, Mark A. [8 ]
机构
[1] Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea
[2] Korea Astron & Space Sci Inst, 776 Daedeok Daero, Daejeon 34055, South Korea
[3] Korea Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea
[4] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
[5] Univ Malaya, Fac Sci, Dept Phys, Kuala Lumpur 50603, Malaysia
[6] Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[7] Kogakuin Univ Technol & Engn, Acad Support Ctr, 2665-1 Nakano, Hachioji, Tokyo 1920015, Japan
[8] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA
基金
新加坡国家研究基金会;
关键词
galaxies: active; galaxies: jets; gamma rays: galaxies; polarization; quasars: individual (PKS 1510-089); ACTIVE GALACTIC NUCLEI; HELICAL MAGNETIC-FIELD; LARGE-AREA TELESCOPE; BL LACERTAE OBJECTS; POLARIMETRIC OBSERVATIONS; RELATIVISTIC JETS; HIGH-FREQUENCIES; LAC OBJECTS; INNER JET; SCALE;
D O I
10.3847/1538-4357/ab1b27
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
PKS 1510-089 is a bright and active gamma-ray source that showed strong and complex gamma-ray flares in mid-2015 during which the Major Atmospheric Gamma Imaging Cerenkov telescopes detected variable very high energy (photon energies >100 GeV) emission. We present long-term multifrequency radio, optical, and gamma-ray light curves of PKS 1510-089 from 2013 to 2018, and results of an analysis of the jet kinematics and linear polarization using 43 GHz Very Long Baseline Array data observed between late 2015 and mid-2017. We find that a strong radio flare trails the gamma-ray flares in 2015, showing an optically thick spectrum at the beginning and becoming optically thin over time. Two laterally separated knots of emission are observed to emerge from the radio core nearly simultaneously during the gamma-ray flares. We detect an edge-brightened linear polarization near the core in the active jet state in 2016, similar to the quiescent jet state in 2008-2013. These observations indicate that the gamma-ray flares may originate from compression of the knots by a standing shock in the core and the jet might consist of multiple complex layers showing time-dependent behavior, rather than of a simple structure of a fast jet spine and a slow jet sheath.
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页数:10
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