NAOC Open IR
Long-term optical spectroscopic variations in blazar 3C 454.3
Nalewajko, Krzysztof1; Gupta, Alok C.2; Liao, Mai3,4; Hryniewicz, Krzysztof1; Gupta, Maitrayee1; Gu, Minfeng3
2019-10-11
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume631Pages:8
AbstractAims. Characterisation of the long-term variations in the broad line region in a luminous blazar, where Comptonisation of broadline emission within a relativistic jet is the standard scenario for production of gamma-ray emission that dominates the spectral energy distribution. Methods. We analysed ten years of optical spectroscopic data from the Steward Observatory for the blazar 3C 454.3, as well as gamma-ray data from the Fermi Large Area Telescope (LAT). The optical spectra are dominated by a highly variable non-thermal synchrotron continuum with a prominent Mg II broad emission line. The line flux was obtained by spectral decomposition including significant contribution from the Fe II pseudo-continuum. Three methods were used to characterise variations in the line flux: (1) stacking of the continuum-subtracted spectra, (2) subtracting the running mean light curves calculated for different timescales, and (3) evaluating potential time delays via the discrete correlation function (DCF). Results. Despite very large variations in the gamma-ray and optical continua, the line flux changes only moderately (<0.1 dex). The data suggest that the line flux responds to a dramatic change in the blazar activity from a very high state in 2010 to a deep low state in 2012. Two interpretations are possible: either the line flux is anti-correlated with the continuum or the increase in the line luminosity is delayed by similar to 600 days. If this time delay results from the reverberation of poorly constrained accretion disc emission in both the broad-line region (BLR) and the synchrotron emitting blazar zone within a relativistic jet, we would obtain natural estimates for the BLR radius R-BLR,R-MgII greater than or similar to 0.8 pc and for the supermassive black hole mass M-SMBH similar to 8.5 x 10(8) M-circle dot. We did not identify additional examples of short-term "flares" of the line flux, in addition to the previously reported case observed in 2010.
Keywordgalaxies: active quasars: emission lines quasars: individual: 3C 454.3
Funding OrganizationFermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China ; Fermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China ; Fermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China ; Fermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China
DOI10.1051/0004-6361/201935904
WOS KeywordSPACE-TELESCOPE OBSERVATIONS ; BROAD-LINE REGION ; MULTIWAVELENGTH OBSERVATIONS ; INFRARED OBSERVATIONS ; XMM-NEWTON ; RAY FLARE ; VARIABILITY ; EMISSION ; RADIATION ; 3C-454.3
Language英语
Funding ProjectFermi Guest Investigator grants[NNX08AW56G] ; Fermi Guest Investigator grants[NNX09AU10G] ; Fermi Guest Investigator grants[NNX12AO93G] ; Fermi Guest Investigator grants[NNX15AU81G] ; Polish National Science Centre grant[2015/18/E/ST9/00580] ; Polish National Science Centre grant[2015/17/B/ST9/03422] ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India[DST/INT/POL/P19/2016] ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant[2016VMB073] ; National Science Foundation of China[11873073] ; National Science Foundation of China[U1531245] ; National Science Foundation of China[11773056] ; National Science Foundation of China[U1831138]
Funding OrganizationFermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China ; Fermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China ; Fermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China ; Fermi Guest Investigator grants ; Fermi Guest Investigator grants ; Polish National Science Centre grant ; Polish National Science Centre grant ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Indo-Poland project - Department of Science and Technology (DST) of the Government of India ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; Chinese Academy of Sciences (CAS) President's International Fellowship Initiative (PIFI) grant ; National Science Foundation of China ; National Science Foundation of China
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000515084100001
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/54322
Collection中国科学院国家天文台
Corresponding AuthorNalewajko, Krzysztof
Affiliation1.Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland
2.Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263002, Nainital, India
3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
4.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Nalewajko, Krzysztof,Gupta, Alok C.,Liao, Mai,et al. Long-term optical spectroscopic variations in blazar 3C 454.3[J]. ASTRONOMY & ASTROPHYSICS,2019,631:8.
APA Nalewajko, Krzysztof,Gupta, Alok C.,Liao, Mai,Hryniewicz, Krzysztof,Gupta, Maitrayee,&Gu, Minfeng.(2019).Long-term optical spectroscopic variations in blazar 3C 454.3.ASTRONOMY & ASTROPHYSICS,631,8.
MLA Nalewajko, Krzysztof,et al."Long-term optical spectroscopic variations in blazar 3C 454.3".ASTRONOMY & ASTROPHYSICS 631(2019):8.
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
[Nalewajko, Krzysztof]'s Articles
[Gupta, Alok C.]'s Articles
[Liao, Mai]'s Articles
Baidu academic
Similar articles in Baidu academic
[Nalewajko, Krzysztof]'s Articles
[Gupta, Alok C.]'s Articles
[Liao, Mai]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Nalewajko, Krzysztof]'s Articles
[Gupta, Alok C.]'s Articles
[Liao, Mai]'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.