EUCLIA—Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing
文献类型：期刊论文
| 作者 | Cai,Zhen-Yi5,7; Wang,Jun-Xian5,7; Zhu,Fei-Fan5,6,7; Sun,Mou-Yuan5,7; Gu,Wei-Min1,2; Cao,Xin-Wu2,3,4; Yuan,Feng2,3 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2018-03-14 |
| 卷号 | 855期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | accretion, accretion disks galaxies: active galaxies: individual (NGC 5548) galaxies: nuclei |
| DOI | 10.3847/1538-4357/aab091 |
| 英文摘要 | Abstract The tight interband correlation and the lag–wavelength relation among UV/optical continua of active galactic nuclei have been firmly established. They are usually understood within the widespread reprocessing scenario; however, the implied interband lags are generally too small. Furthermore, it is challenged by new evidence, such as that the X-ray reprocessing yields too much high-frequency UV/optical variation and that it fails to reproduce the observed timescale-dependent color variations among the Swift light curves of NGC 5548. In a different manner, we demonstrate that an upgraded inhomogeneous accretion disk model, whose local independent temperature fluctuations are subject to a speculated common large-scale temperature fluctuation, can intrinsically generate the tight interband correlation and lag across the UV/optical and be in nice agreement with several observational properties of NGC 5548, including the timescale-dependent color variation. The emergent lag is a result of the differential regression capability of local temperature fluctuations when responding to the large-scale fluctuation. An average speed of propagations as large as ?15% of the speed of light may be required by this common fluctuation. Several potential physical mechanisms for such propagations are discussed. Our interesting phenomenological scenario may shed new light on comprehending the UV/optical continuum variations of active galactic nuclei. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-855-2-AAB091 |
| 源URL | [http://119.78.226.72/handle/331011/32075]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China 2.SHAO-XMU Joint Center for Astrophysics, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China 4.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People’s Republic of China 5.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, People’s Republic of China 6.Department of Astronomy and Astrophysics, 537 Davey Lab, The Pennsylvania State University, University Park, PA 16802, USA 7.CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, People’s Republic of China; zcai@ustc.edu.cn, jxw@ustc.edu.cn |
| 推荐引用方式 GB/T 7714 | Cai,Zhen-Yi,Wang,Jun-Xian,Zhu,Fei-Fan,et al. EUCLIA—Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing[J]. The Astrophysical Journal,2018,855(2). |
| APA | Cai,Zhen-Yi.,Wang,Jun-Xian.,Zhu,Fei-Fan.,Sun,Mou-Yuan.,Gu,Wei-Min.,...&Yuan,Feng.(2018).EUCLIA—Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing.The Astrophysical Journal,855(2). |
| MLA | Cai,Zhen-Yi,et al."EUCLIA—Exploring the UV/Optical Continuum Lag in Active Galactic Nuclei. I. A Model without Light Echoing".The Astrophysical Journal 855.2(2018). |
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