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A COMPARATIVE STUDY OF OPTICAL/ULTRAVIOLET VARIABILITY OF NARROW-LINE SEYFERT 1 AND BROAD-LINE SEYFERT 1 ACTIVE GALACTIC NUCLEI
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
发表期刊ASTRONOMICAL JOURNAL
2013-04
卷号145期号:4
DOI10.1088/0004-6256/145/4/90
产权排序第2完成单位
收录类别SCI
关键词Galaxies: Active Galaxies: Photometry Galaxies: Seyfert Quasars: General
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.

资助项目National Basic Research Program of (973 Program)[2009CB824800] ; NSFC[11033007] ; NSFC[11103071] ; Alfred P. Sloan Foundation ; National Science Foundation ; U.S. Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England ; LAMOST Postdoctoral Fellowship Program
项目资助者National Basic Research Program of (973 Program)[2009CB824800] ; NSFC[11033007, 11103071] ; Alfred P. Sloan Foundation ; National Science Foundation ; U.S. Department of Energy ; National Aeronautics and Space Administration ; Japanese Monbukagakusho ; Max Planck Society ; Higher Education Funding Council for England ; LAMOST Postdoctoral Fellowship Program
语种英语
学科领域天文学 ; 星系与宇宙学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
WOS记录号WOS:000316247300004
WOS研究方向Astronomy & Astrophysics
WOS类目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
引用统计
被引频次:30[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5035
专题高能天体物理研究组
通讯作者Ai YL(艾艳丽)
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
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
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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).
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