The ever-surprising blazar OJ 287: multiwavelength study and appearance of a new component in X-rays

doi:10.1093/mnras/sty1499

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	The ever-surprising blazar OJ 287: multiwavelength study and appearance of a new component in X-rays
	Kushwaha, Pankaj 2; Gupta, Alok C.3,4; Wiita, Paul J.5; Pal, Main 6; Gaur, Haritma 3; de Gouveia Dal Pino, E. M.2; Kurtanidze, O. M.7,8,9,10; Semkov, E.11,12; Damljanovic, G.1; Hu, S. M.13
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-09-01
卷号	479 期号:2 页码:1672-1684
关键词	radiation mechanisms: non-thermal galaxies: active BL Lacertae objects: individual: OJ 287 galaxies: jets gamma-rays: galaxies X-rays: galaxies
ISSN号	0035-8711
DOI	10.1093/mnras/sty1499
英文摘要	We present a multiwavelength spectral and temporal investigation of OJ 287 emission during its strong optical-to-X-ray activity between 2016 July and 2017 July. The daily. gamma-ray fluxes from Fermi-Large Area Telescope (LAT) are consistent with no variability. The strong optical-to-X-ray variability is accompanied by a change in power-law spectral index of the X-ray spectrum from <2 to >2, with variations often associated with changes in optical polarization properties. Cross-correlations between optical-to-X-ray emission during four continuous segments show simultaneous optical-ultraviolet (UV) variations, while the X-ray and UV/optical are simultaneous only during the middle two segments. In the first segment, the results suggest X-rays lag the optical/UV, while in the last segment X-rays lead by similar to 5-6 d. The last segment also shows a systematic trend with variations appearing first at higher energies followed by lower energy ones. The LAT spectrum before the very high-energy (VHE) activity is similar to preceding quiescent state spectrum, while it hardens during VHE activity period and is consistent with the extrapolated VHE spectrum during the latter. Overall, the broad-band spectral energy distributions (SEDs) during high-activity periods are a combination of a typical OJ 287 SED and a high-energy peaked (HBL) SED and can be explained in a two-zone leptonic model, with the second zone located at parsec scales, beyond the broad line region, being responsible for the HBL-like spectrum. The change of polarization properties from systematic to chaotic and back to systematic, before, during, and after the VHE activity, suggests dynamic roles for magnetic fields and turbulence.
资助项目	NASA/Fermi Guest Investigator grants[NNX08AW56G] ; NASA/Fermi Guest Investigator grants[NNX09AU10G] ; NASA/Fermi Guest Investigator grants[NNX12AO93G] ; NASA/Fermi Guest Investigator grants[NNX15AU81G] ; FAPESP[2015/13933-0] ; Indo-Poland project - Department of Science and Technology (DST), Government of India[DST/INT/POL/P-19/2016] ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI)[2016VMB073] ; CAS Visiting Fellowship ; CAS PIFI - NSFC Research Fund for International Young Scientists[2014FFJB0005] ; CAS PIFI - NSFC Research Fund for International Young Scientists[11450110398] ; China Postdoctoral Science Foundation[2016T90393] ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital[IFA17-PH197] ; Brazilian funding agency FAPESP[2013/10559-5] ; Brazilian funding agency CNPq[306598/2009-4] ; Shota Rustaveli National Science Foundation[FR/217950/16] ; Bulgarian National Science Fund of the Ministry of Education and Science[DN 08-1/2016] ; Bulgarian National Science Fund of the Ministry of Education and Science[DN 18-13/2017] ; Institute of Astronomy ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Ministry of Education, Science and Technological Development of the Republic of Serbia[176011] ; Ministry of Education, Science and Technological Development of the Republic of Serbia[176004] ; Ministry of Education, Science and Technological Development of the Republic of Serbia[176021] ; National Natural Science Foundation of China[11203016] ; National Natural Science Foundation of China[11143012] ; Young Scholars Program of Shandong University, Weihai, China ; National Science Foundation of China[11473054] ; National Science Foundation of China[U1531245] ; CAS Hundred-Talented program[Y787081009]
WOS关键词	MULTIBAND OPTICAL VARIABILITY ; LACERTAE OBJECT OJ-287 ; DIVERSE TIME-SCALES ; BLACK-HOLE ; TELESCOPE ; FLARE ; MODEL ; PHOTOMETRY ; OUTBURSTS ; STARS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000441380100018
资助机构	NASA/Fermi Guest Investigator grants ; NASA/Fermi Guest Investigator grants ; FAPESP ; FAPESP ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; CAS Visiting Fellowship ; CAS Visiting Fellowship ; CAS PIFI - NSFC Research Fund for International Young Scientists ; CAS PIFI - NSFC Research Fund for International Young Scientists ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Brazilian funding agency FAPESP ; Brazilian funding agency FAPESP ; Brazilian funding agency CNPq ; Brazilian funding agency CNPq ; Shota Rustaveli National Science Foundation ; Shota Rustaveli National Science Foundation ; Bulgarian National Science Fund of the Ministry of Education and Science ; Bulgarian National Science Fund of the Ministry of Education and Science ; Institute of Astronomy ; Institute of Astronomy ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Young Scholars Program of Shandong University, Weihai, China ; Young Scholars Program of Shandong University, Weihai, China ; National Science Foundation of China ; National Science Foundation of China ; CAS Hundred-Talented program ; CAS Hundred-Talented program ; NASA/Fermi Guest Investigator grants ; NASA/Fermi Guest Investigator grants ; FAPESP ; FAPESP ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; CAS Visiting Fellowship ; CAS Visiting Fellowship ; CAS PIFI - NSFC Research Fund for International Young Scientists ; CAS PIFI - NSFC Research Fund for International Young Scientists ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Brazilian funding agency FAPESP ; Brazilian funding agency FAPESP ; Brazilian funding agency CNPq ; Brazilian funding agency CNPq ; Shota Rustaveli National Science Foundation ; Shota Rustaveli National Science Foundation ; Bulgarian National Science Fund of the Ministry of Education and Science ; Bulgarian National Science Fund of the Ministry of Education and Science ; Institute of Astronomy ; Institute of Astronomy ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Young Scholars Program of Shandong University, Weihai, China ; Young Scholars Program of Shandong University, Weihai, China ; National Science Foundation of China ; National Science Foundation of China ; CAS Hundred-Talented program ; CAS Hundred-Talented program ; NASA/Fermi Guest Investigator grants ; NASA/Fermi Guest Investigator grants ; FAPESP ; FAPESP ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; CAS Visiting Fellowship ; CAS Visiting Fellowship ; CAS PIFI - NSFC Research Fund for International Young Scientists ; CAS PIFI - NSFC Research Fund for International Young Scientists ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Brazilian funding agency FAPESP ; Brazilian funding agency FAPESP ; Brazilian funding agency CNPq ; Brazilian funding agency CNPq ; Shota Rustaveli National Science Foundation ; Shota Rustaveli National Science Foundation ; Bulgarian National Science Fund of the Ministry of Education and Science ; Bulgarian National Science Fund of the Ministry of Education and Science ; Institute of Astronomy ; Institute of Astronomy ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Young Scholars Program of Shandong University, Weihai, China ; Young Scholars Program of Shandong University, Weihai, China ; National Science Foundation of China ; National Science Foundation of China ; CAS Hundred-Talented program ; CAS Hundred-Talented program ; NASA/Fermi Guest Investigator grants ; NASA/Fermi Guest Investigator grants ; FAPESP ; FAPESP ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Indo-Poland project - Department of Science and Technology (DST), Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) ; CAS Visiting Fellowship ; CAS Visiting Fellowship ; CAS PIFI - NSFC Research Fund for International Young Scientists ; CAS PIFI - NSFC Research Fund for International Young Scientists ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Department of Science & Tech-nology, India through INSPIRE faculty award at ARIES, Nainital ; Brazilian funding agency FAPESP ; Brazilian funding agency FAPESP ; Brazilian funding agency CNPq ; Brazilian funding agency CNPq ; Shota Rustaveli National Science Foundation ; Shota Rustaveli National Science Foundation ; Bulgarian National Science Fund of the Ministry of Education and Science ; Bulgarian National Science Fund of the Ministry of Education and Science ; Institute of Astronomy ; Institute of Astronomy ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Rozhen National Astronomical Observatory, Bulgaria Academy of Sciences, via bilateral joint research project 'Study of ICRF radio-sources and fast variable astronomical objects" ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; Ministry of Education, Science and Technological Development of the Republic of Serbia ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Young Scholars Program of Shandong University, Weihai, China ; Young Scholars Program of Shandong University, Weihai, China ; National Science Foundation of China ; National Science Foundation of China ; CAS Hundred-Talented program ; CAS Hundred-Talented program
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/22286]
专题	中国科学院国家天文台
通讯作者	Kushwaha, Pankaj; Gupta, Alok C.; Wiita, Paul J.
作者单位	1.Astron Observ, Volgina 7, Belgrade 11060, Serbia 2.Univ Sao Paulo, Dept Astron IAG USP, BR-05508090 Sao Paulo, Brazil 3.Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263002, Nainital, India 4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 5.Coll New Jersey, Dept Phys, POB 7718, Ewing, NJ 08628 USA 6.Astron & Astrophys Div, Phys Res Lab, Ahmadabad 380009, Gujarat, India 7.Abastumani Observ, Abastumani 0301, Rep of Georgia 8.Kazan Fed Univ, Engelhardt Astron Observ, Tatarstan 420008, Russia 9.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China 10.Chinese Acad Sci, Natl Astron Observat, Key Lab Opt Astron, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Kushwaha, Pankaj,Gupta, Alok C.,Wiita, Paul J.,et al. The ever-surprising blazar OJ 287: multiwavelength study and appearance of a new component in X-rays[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,479(2):1672-1684.
APA	Kushwaha, Pankaj.,Gupta, Alok C..,Wiita, Paul J..,Pal, Main.,Gaur, Haritma.,...&Zhang, Z..(2018).The ever-surprising blazar OJ 287: multiwavelength study and appearance of a new component in X-rays.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,479(2),1672-1684.
MLA	Kushwaha, Pankaj,et al."The ever-surprising blazar OJ 287: multiwavelength study and appearance of a new component in X-rays".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 479.2(2018):1672-1684.