NAOC Open IR
The Changing-look Blazar B2 1420+32
Mishra, Hora D.1; Dai, Xinyu1; Chen, Ping2,3; Cheng, Jigui4; Jayasinghe, T.5; Tucker, Michael A.6; Vallely, Patrick J.5; Bersier, David7; Bose, Subhash5,8; Do, Aaron6; Dong, Subo2; Holoien, Thomas W. -S.9; Huber, Mark E.6; Kochanek, Christopher S.5,8; Liang, Enwei4; Payne, Anna V.6; Prieto, Jose10; Shappee, Benjamin J.6; Stanek, K. Z.5,8; Bhatiani, Saloni1; Cox, John1; DeFrancesco, Cora1; Shen, Zhiqiang11; Thompson, Todd A.5,8; Wang, Junfeng12
2021-06-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume913Issue:2Pages:12
AbstractBlazars are active galactic nuclei with their relativistic jets pointing toward the observer, comprising two major subclasses, flat-spectrum radio quasars (FSRQs) and BL Lac objects. We present multiwavelength photometric and spectroscopic monitoring observations of the blazar B2 1420+32, focusing on its outbursts in 2018-2020. Multiepoch spectra show that the blazar exhibited large-scale spectral variability in both its continuum and line emission, accompanied by dramatic gamma-ray and optical variability by factors of up to 40 and 15, respectively, on week to month timescales. Over the last decade, the gamma-ray and optical fluxes increased by factors of 1500 and 100, respectively. B2 1420+32 was an FSRQ with broad emission lines in 1995. Following a series of flares starting in 2018, it transitioned between BL Lac and FSRQ states multiple times, with the emergence of a strong Fe pseudocontinuum. Two spectra also contain components that can be modeled as single-temperature blackbodies of 12,000 and 5200 K. Such a collection of "changing-look" features has never been observed previously in a blazar. We measure gamma-ray-optical and interband optical lags implying emission-region separations of less than 800 and 130 gravitational radii, respectively. Since most emission-line flux variations, except the Fe continuum, are within a factor of 2-3, the transitions between FSRQ and BL Lac classifications are mainly caused by the continuum variability. The large Fe continuum flux increase suggests the occurrence of dust sublimation releasing more Fe ions in the central engine and an energy transfer from the relativistic jet to subrelativistic emission components.
Funding OrganizationNASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program ; NASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program ; NASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program ; NASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program
DOI10.3847/1538-4357/abf63d
WOS KeywordACTIVE GALACTIC NUCLEI ; BROAD-LINE REGION ; BL-LAC OBJECTS ; RADIO GALAXIES ; EMISSION-LINES ; OPTICAL SPECTROSCOPY ; DOPPLER FACTORS ; ACCRETION DISC ; VARIABILITY ; TELESCOPE
Language英语
Funding ProjectNASA ADAP program[NNX17AF26G] ; Gordon and Betty Moore Foundation[GBMF5490] ; NSF[AST-181440] ; NSF[AST-1515927] ; NSF[AST-1908570] ; NSF[AST-0908816] ; NSF[AST-1907570] ; NSF[AST-1920392] ; NSF[AST-1911074] ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; NASA[80NSSC19K1717] ; Danish National Research Foundation[DNRF132] ; DOE CSGF[DE-SC0019323] ; FONDECYT[1151445] ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative[IC120009] ; Scialog Scholar grant from the Research Corporation[24215] ; NAOC ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program[DGE-1343012]
Funding OrganizationNASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program ; NASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program ; NASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program ; NASA ADAP program ; NASA ADAP program ; Gordon and Betty Moore Foundation ; Gordon and Betty Moore Foundation ; NSF ; NSF ; Mount Cuba Astronomical Foundation ; Mount Cuba Astronomical Foundation ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Center for Cosmology and AstroParticle Physics at the Ohio State University ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA) ; Villum Foundation ; Villum Foundation ; NASA ; NASA ; Danish National Research Foundation ; Danish National Research Foundation ; DOE CSGF ; DOE CSGF ; FONDECYT ; FONDECYT ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Ministry of Economy, Development, and Tourism's Millennium Science Initiative ; Scialog Scholar grant from the Research Corporation ; Scialog Scholar grant from the Research Corporation ; NAOC ; NAOC ; CAS ; CAS ; Special Fund for Astronomy from the Ministry of Finance ; Special Fund for Astronomy from the Ministry of Finance ; National Science Foundation Graduate Research Fellowship Program ; National Science Foundation Graduate Research Fellowship Program
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000658484300001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77094
Collection中国科学院国家天文台
Corresponding AuthorMishra, Hora D.
Affiliation1.Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA
2.Peking Univ, Kavli Inst Astron & Astrophys, Yi He Yuan Rd 5, Beijing 100871, Peoples R China
3.Peking Univ, Sch Phys, Dept Astron, Yi He Yuan Rd 5, Beijing 100871, Peoples R China
4.Guangxi Univ, Sch Phys Sci & Technol, Nanning 530004, Peoples R China
5.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA
6.Univ Hawaii Manoa, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA
7.Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
8.Ohio State Univ, Ctr Cosmol & AstroParticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA
9.Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA
10.Univ Diego Portales, Nucleo Astron, Fac Ingn & Ciencias, Av Ejercito 441, Santiago, Chile
11.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
12.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
Recommended Citation
GB/T 7714
Mishra, Hora D.,Dai, Xinyu,Chen, Ping,et al. The Changing-look Blazar B2 1420+32[J]. ASTROPHYSICAL JOURNAL,2021,913(2):12.
APA Mishra, Hora D..,Dai, Xinyu.,Chen, Ping.,Cheng, Jigui.,Jayasinghe, T..,...&Wang, Junfeng.(2021).The Changing-look Blazar B2 1420+32.ASTROPHYSICAL JOURNAL,913(2),12.
MLA Mishra, Hora D.,et al."The Changing-look Blazar B2 1420+32".ASTROPHYSICAL JOURNAL 913.2(2021):12.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Mishra, Hora D.]'s Articles
[Dai, Xinyu]'s Articles
[Chen, Ping]'s Articles
Baidu academic
Similar articles in Baidu academic
[Mishra, Hora D.]'s Articles
[Dai, Xinyu]'s Articles
[Chen, Ping]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Mishra, Hora D.]'s Articles
[Dai, Xinyu]'s Articles
[Chen, Ping]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.