Flux and spectral variation characteristics of 3C 454.3 at the GeV band
文献类型：期刊论文
| 作者 | Zhang, Hai-Ming1; Zhang, Jin2; Lu, Rui-Jing1; Yi, Ting-Feng3; Huang, Xiao-Li1; Liang, En-Wei1 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2018-04-01 |
| 卷号 | 18期号:4页码:20 |
| 关键词 | gamma rays: galaxies galaxies: jets quasars: individual (3C 454.3) |
| ISSN号 | 1674-4527 |
| DOI | 10.1088/1674-4527/18/4/40 |
| 英文摘要 | We analyze the long-term lightcurve of 3C 454.3 observed with Fermi/LAT and investigate its relation to flux in the radio, optical and X-ray bands. By fitting the 1-day binned GeV lightcurve with multiple Gaussian functions (MGF), we propose that the typical variability timescale in the GeV band is 1-10 d. The GeV flux variation is accompanied by the spectral variation characterized as flux-tracking, i.e., "harder when brighter." The GeV flux is correlated with the optical and X-ray fluxes, and a weak correlation between gamma-ray flux and radio flux is also observed. The gamma-ray flux is not correlated with the optical linear polarization degree for the global lightcurves, but they show a correlation for the lightcurves before MJD 56000. The power density spectrum of the global lightcurve shows an obvious turnover at similar to 7.7 d, which may indicate a typical variability timescale of 3C 454.3 in the gamma-ray band. This is also consistent with the derived timescales by fitting the global lightcurve with MGF. The spectral evolution and an increase in the optical linear polarization degree along with the increase in gamma-ray flux may indicate that the radiation particles are accelerated and the magnetic field is ordered by the shock processes during the outbursts. In addition, the nature of 3C 454.3 may be consistent with a self-organized criticality system, similar to Sagittarius A*, and thus the outbursts could be from plasmoid ejections driven by magnetic reconnection. This may further support the idea that the jet radiation regions are magnetized. |
| WOS关键词 | FLARING ACTIVITY ; TEV BLAZARS ; SPACED DATA ; MRK 421 ; OJ 287 ; VARIABILITY ; OUTBURST ; MARKARIAN-421 |
| 资助项目 | NASA ; NASA[NNX08AW31G] ; NASA[NNX11A043G] ; NASA[NNX14AQ89G] ; NSF[AST-0808050] ; NSF[AST-1109911] ; National Natural Science Foundation of China[11573034] ; National Natural Science Foundation of China[11533003] ; National Natural Science Foundation of China[11363002] ; National Natural Science Foundation of China[11373036] ; National Natural Science Foundation of China[11463001] ; National Natural Science Foundation of China[U1731239] ; National Basic Research Program of China (973 Programme)[2014CB845800] ; Guangxi Science Foundation for Guangxi Distinguished Professors |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000430282700004 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| 资助机构 | NASA ; NASA ; NASA ; NASA ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Programme) ; National Basic Research Program of China (973 Programme) ; Guangxi Science Foundation for Guangxi Distinguished Professors ; Guangxi Science Foundation for Guangxi Distinguished Professors ; NASA ; NASA ; NASA ; NASA ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Programme) ; National Basic Research Program of China (973 Programme) ; Guangxi Science Foundation for Guangxi Distinguished Professors ; Guangxi Science Foundation for Guangxi Distinguished Professors ; NASA ; NASA ; NASA ; NASA ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Programme) ; National Basic Research Program of China (973 Programme) ; Guangxi Science Foundation for Guangxi Distinguished Professors ; Guangxi Science Foundation for Guangxi Distinguished Professors ; NASA ; NASA ; NASA ; NASA ; NSF ; NSF ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Basic Research Program of China (973 Programme) ; National Basic Research Program of China (973 Programme) ; Guangxi Science Foundation for Guangxi Distinguished Professors ; Guangxi Science Foundation for Guangxi Distinguished Professors |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/37181]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Zhang, Jin |
| 作者单位 | 1.Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Space Astron & Technol, Beijing 100101, Peoples R China 3.Yunnan Normal Univ, Dept Phys, Kunming 650500, Yunnan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Hai-Ming,Zhang, Jin,Lu, Rui-Jing,et al. Flux and spectral variation characteristics of 3C 454.3 at the GeV band[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2018,18(4):20. |
| APA | Zhang, Hai-Ming,Zhang, Jin,Lu, Rui-Jing,Yi, Ting-Feng,Huang, Xiao-Li,&Liang, En-Wei.(2018).Flux and spectral variation characteristics of 3C 454.3 at the GeV band.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,18(4),20. |
| MLA | Zhang, Hai-Ming,et al."Flux and spectral variation characteristics of 3C 454.3 at the GeV band".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 18.4(2018):20. |
入库方式： OAI收割
来源：国家天文台
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