Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014-2018

doi:10.3847/1538-4357/ab2f7e

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	Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014-2018
	Ding, N.1,2; Gu, Q. S.1,2; Geng, X. F.3,4; Xiong DR(熊定荣)5,6 ; Xue, R.1,2; Wang, X. Y.1,2; Guo, X. T.1,2
刊名	ASTROPHYSICAL JOURNAL
	2019-08-20
卷号	881 期号:2 页码:17
关键词	galaxies: active galaxies: jets quasars: individual (PKS 1502+106) radiation mechanisms: nonthermal
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab2f7e
产权排序	第5完成单位
文献子类	Article
英文摘要	The origin of the multiband activities (outbursts/flares) of blazars is still a heavily debated topic. Shock and magnetic reconnection have long been considered as possible triggers of the multiband activities. In this paper, we present an exploration of the origin of multiband activities for a high-redshift (z = 1.8385) flat-spectrum radio quasar PKS. 1502+106. Utilizing multiband data from radio to gamma-ray and optical polarization observations, we investigate two dramatic activities in detail: a gamma-ray-dominated outburst in 2015 and an optical-dominated outburst in 2017. Our main results are as follows. (I) A fast gamma-ray flare with a flux-doubling timescale as short as 1 hr in 2015 is discovered. Based on the variability timescale, the physical parameters of the flaring region (e.g., minimum Doppler factor, emission region size, etc.) are constrained. At the peak of the flare, the gamma-ray spectrum hardens to Gamma(gamma) = 1.82 +/- 0.04 and exhibits an obvious curvature/break characteristic that is caused by the typical "cooling break." Modeling of multiband spectral energy distributions reveal a very hard electronic energy spectrum with the electronic spectral index of 1.07 +/- 0.53. This result suggests that this fast gamma-ray flare may be triggered by magnetic reconnection. (II) During the outburst in 2017, the degree of optical polarization and optical fluxes showed a very tight correlation. By analyzing the Stokes parameters of polarization observations, our results show that this outburst could be triggered by a transverse shock with a compression ratio of eta > 2.2, and the magnetic field intensity of the shock emission region is about 0.032. G.
学科主题	天文学 ; 星系与宇宙学
URL标识	查看原文
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
资助项目	National Key R&D Program of China[2017YFA0402703] ; National Natural Science Foundation of China[11703078] ; National Natural Science Foundation of China[11733002] ; Fermi Guest Investigator grants[NNX08AW56G] ; Fermi Guest Investigator grants[NNX09AU10G] ; Fermi Guest Investigator grants[NNX12AO93G] ; Fermi Guest Investigator grants[NNX15AU81G] ; NASA[NNX08AW31G] ; NASA[NNX11A043G] ; NASA[NNX14AQ89G] ; NSF[AST-0808050] ; NSF[AST-1109911]
WOS关键词	EXTRAGALACTIC BACKGROUND LIGHT ; SPACE-TELESCOPE OBSERVATIONS ; GAMMA-RAY EMISSION ; BL-LAC OBJECTS ; PHYSICAL-PROPERTIES ; CROSS-CORRELATIONS ; FERMI ; BLAZARS ; VARIABILITY ; MODELS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000482527100008
资助机构	National Key R&D Program of China[2017YFA0402703] ; National Natural Science Foundation of China[11703078, 11733002] ; Fermi Guest Investigator grants[NNX08AW56G, NNX09AU10G, NNX12AO93G, NNX15AU81G] ; National Aeronautics & Space Administration (NASA)[NNX08AW31G, NNX11A043G, NNX14AQ89G] ; National Science Foundation (NSF)[AST-0808050, AST-1109911]
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/20877]
专题	云南天文台_丽江天文观测站（南方基地）云南天文台_中国科学院天体结构与演化重点实验室
通讯作者	Ding, N.
作者单位	1.School of Astronomy and Space Science, Nanjing University, Nanjing, Jiangsu 210093, People's Republic of China 2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210093, People's Republic of China 3.Department of Physics, Yunnan University, Kunming, 650091, People's Republic of China 4.Key Laboratory of Astroparticle Physics, Yunnan Province, Kunming 650091, People's Republic of China 5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China 6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People's Republic of China
推荐引用方式 GB/T 7714	Ding, N.,Gu, Q. S.,Geng, X. F.,et al. Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014-2018[J]. ASTROPHYSICAL JOURNAL,2019,881(2):17.
APA	Ding, N..,Gu, Q. S..,Geng, X. F..,Xiong DR.,Xue, R..,...&Guo, X. T..(2019).Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014-2018.ASTROPHYSICAL JOURNAL,881(2),17.
MLA	Ding, N.,et al."Exploring the Origin of Multiwavelength Activities of High-redshift Flat-spectrum Radio Quasar PKS 1502+106 during 2014-2018".ASTROPHYSICAL JOURNAL 881.2(2019):17.