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-Yi3,7; Wang, Jun-Xian3,7; Zhu, Fei-Fan3,6,7; Sun, Mou-Yuan3,7; Gu, Wei-Min4,5; Cao, Xin-Wu1,2,4; Yuan, Feng1,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-03-10 |
| 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 | 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 greater than or similar to 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. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000427492200004 |
| 源URL | [http://119.78.226.72/handle/331011/32491]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Cai, Zhen-Yi |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China 4.Xiamen Univ, SHAO XMU Joint Ctr Astrophys, Xiamen 361005, Fujian, Peoples R China 5.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 6.Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA 7.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China |
| 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]. 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.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".ASTROPHYSICAL JOURNAL 855.2(2018). |
入库方式： OAI收割
来源：上海天文台
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