Long-term optical spectroscopic variations in blazar 3C 454.3
文献类型：期刊论文
| 作者 | Nalewajko, Krzysztof1; Gupta, Alok C.2; Liao, Mai3,4; Hryniewicz, Krzysztof1; Gupta, Maitrayee1; Gu, Minfeng3 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2019-10-11 |
| 卷号 | 631页码:8 |
| 关键词 | galaxies: active quasars: emission lines quasars: individual: 3C 454.3 |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/201935904 |
| 英文摘要 | Aims. 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. |
| WOS关键词 | SPACE-TELESCOPE OBSERVATIONS ; BROAD-LINE REGION ; MULTIWAVELENGTH OBSERVATIONS ; INFRARED OBSERVATIONS ; XMM-NEWTON ; RAY FLARE ; VARIABILITY ; EMISSION ; RADIATION ; 3C-454.3 |
| 资助项目 | Fermi 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] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000515084100001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | 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 ; 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 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/54321]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Nalewajko, Krzysztof |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：国家天文台
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