A COMPARATIVE STUDY OF OPTICAL/ULTRAVIOLET VARIABILITY OF NARROW-LINE SEYFERT 1 AND BROAD-LINE SEYFERT 1 ACTIVE GALACTIC NUCLEI
文献类型：期刊论文
| 作者 | Ai YL(艾艳丽)1,2 ; Yuan, W3; Zhou, H4,5,6; Wang, TG4,5; Dong, XB4,5; Wang JG(王建国)2; Lu, HL4,5
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| 刊名 | ASTRONOMICAL JOURNAL
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| 出版日期 | 2013-04 |
| 卷号 | 145期号:4 |
| 关键词 | galaxies: active galaxies: photometry galaxies: Seyfert quasars: general |
| ISSN号 | 0004-6256 |
| 产权排序 | 第二完成单位 |
| 通讯作者 | Ai, YL (reprint author), Peking Univ, Dept Astron, Beijing 100871, Peoples R China. |
| 英文摘要 | The ensemble optical/ultraviolet (UV) variability of narrow-line Seyfert 1 (NLS1)-type active galactic nuclei (AGNs) is investigated, based on a sample selected from the Sloan Digital Sky Survey (SDSS) Stripe 82 region with multi-epoch photometric scanning data. As a comparison, a control sample of broad-line Seyfert 1 (BLS1)-type AGNs is also incorporated. To quantify properly the intrinsic variation amplitudes and their uncertainties, a novel method of parametric maximum likelihood is introduced that has, as we argued, certain virtues over previously used methods. The majority of NLS1-type AGNs exhibit significant variability on timescales from about 10 days to a few years with, however, smaller amplitudes on average compared to BLS1-type AGNs. About 20 NLS1-type AGNs that show relatively large variations are presented and may deserve future monitoring observations, for instance, reverberation mapping. The averaged structure functions of variability, constructed using the same maximum likelihood method, show remarkable similarity in shape for the two types of AGNs on timescales longer than about 10 days, which can be approximated by a power law or an exponential function. This, along with other similar properties, such as the wavelength-dependent variability, is indicative of a common dominant mechanism responsible for the long-term optical/UV variability of both NLS1- and BLS1-type AGNs. Toward the short timescales, however, there is tentative evidence that the structure function of NLS1-type AGNs continues to decline, whereas that of BLS1-type AGNs flattens with some residual variability on timescales of days. If this can be confirmed, it may suggest that an alternative mechanism, such as X-ray reprocessing, starts to dominate in BLS1-type AGNs, but not in NLS1-type AGNs, on such timescales. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIGITAL SKY SURVEY ; X-RAY-PROPERTIES ; SLIM ACCRETION DISKS ; BLACK-HOLE MASSES ; FE II EMISSION ; SDSS STRIPE 82 ; OPTICAL VARIABILITY ; RADIO-LOUD ; QUASAR VARIABILITY ; DATA RELEASE |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-6256/145/4/90/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000316247300004 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5035]  |
| 专题 | 云南天文台_高能天体物理研究组 |
| 作者单位 | 1.Department of Astronomy, Peking University, Beijing 100871, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan, China 3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 4.Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Science, Hefei, Anhui 230026, China 5.Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, China 6.Polar Research Institute of China, 451 Jinqiao Road, Pudong, Shanghai 200136, China |
| 推荐引用方式 GB/T 7714 | Ai YL,Yuan, W,Zhou, H,et al. A COMPARATIVE STUDY OF OPTICAL/ULTRAVIOLET VARIABILITY OF NARROW-LINE SEYFERT 1 AND BROAD-LINE SEYFERT 1 ACTIVE GALACTIC NUCLEI[J]. ASTRONOMICAL JOURNAL,2013,145(4). |
| APA | Ai YL.,Yuan, W.,Zhou, H.,Wang, TG.,Dong, XB.,...&Lu, HL.(2013).A COMPARATIVE STUDY OF OPTICAL/ULTRAVIOLET VARIABILITY OF NARROW-LINE SEYFERT 1 AND BROAD-LINE SEYFERT 1 ACTIVE GALACTIC NUCLEI.ASTRONOMICAL JOURNAL,145(4). |
| MLA | Ai YL,et al."A COMPARATIVE STUDY OF OPTICAL/ULTRAVIOLET VARIABILITY OF NARROW-LINE SEYFERT 1 AND BROAD-LINE SEYFERT 1 ACTIVE GALACTIC NUCLEI".ASTRONOMICAL JOURNAL 145.4(2013). |
入库方式： OAI收割
来源：云南天文台
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