Swift monitoring observations of Mrk 231: detection of ultraviolet variability

doi:10.1093/mnras/sty2253

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	Swift monitoring observations of Mrk 231: detection of ultraviolet variability
	Yang, Lilan 2; Dai, Xinyu 3; Lu, Youjun 1,4; Zhu, Zong-Hong 2,5; Shankar, Francesco 6
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-11-01
卷号	480 期号:4 页码:5504-5510
关键词	accretion, accretion discs black hole physics galaxies: active galaxies: individual (Mrk 231) quasars: absorption lines ultraviolet: general
ISSN号	0035-8711
DOI	10.1093/mnras/sty2253
英文摘要	We analyse 168 Swift monitoring observations of the nearest broad absorption line quasar Mrk 231 in the ultraviolet (UV) and X-ray bands, where we detect significant variability in the UV (similar to 2246 angstrom) light curve with a null probability of 4.3 x 10(-10) for a constant model. Separately, from an archival sample of Swift observed active galactic nuclei (AGNs), we measure the relation between UV excess variance and luminosity, finding that the normalized UV excess variance decreases with luminosity. Comparing to this mean relation, the normalized UV excess variance of Mrk 231 is smaller, however within the scatter characterizing the full population. The upper limit of the X-ray excess variance is consistent with other AGN. The power spectrum density (PSD) of the UV light curve can be well fit by a power-law model with a slope of 1.82 +/- 0.14 between 10(-7.5) and 10(-6) Hz, consistent with those for typical AGN, with no obvious quasi-periodical oscillation peaks. The UV variability and its power spectrum suggest that a significant amount of the UV emission of Mrk 231 is from the accretion disc. The consistencies in the normalized UV variability and the shape of the PSD between Mrk 231 and other normal AGN suggest that the origin of UV variability of broad absorption line quasars is similar to other AGN, and dust scattering at large scales such as the torus is not a dominating process for the UV emission of Mrk 231. Significant scattering, if present, is constrained to smaller than similar to 10 light days. We perform lagged correlation analysis between the UV and X-ray light curves and find the correlation insignificant within the present data.
资助项目	NSF[AST-1413056] ; National Key Program for Science and Technology Research and Development[2016YFA0400704] ; Strategic Priority Program of the Chinese Academy of Sciences[XDB 23040100] ; National Natural Science Foundation of China[11690024] ; National Natural Science Foundation of China[11390372]
WOS关键词	X-RAY VARIABILITY ; ACTIVE GALACTIC NUCLEI ; ABSORPTION-LINE QUASAR ; BLACK-HOLE MASS ; SEYFERT-1 GALAXIES ; XMM-NEWTON ; TELESCOPE ; FRACTION ; QSOS ; CALIBRATION
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000449617100096
资助机构	NSF ; NSF ; National Key Program for Science and Technology Research and Development ; National Key Program for Science and Technology Research and Development ; Strategic Priority Program of the Chinese Academy of Sciences ; Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSF ; NSF ; National Key Program for Science and Technology Research and Development ; National Key Program for Science and Technology Research and Development ; Strategic Priority Program of the Chinese Academy of Sciences ; Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSF ; NSF ; National Key Program for Science and Technology Research and Development ; National Key Program for Science and Technology Research and Development ; Strategic Priority Program of the Chinese Academy of Sciences ; Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; NSF ; NSF ; National Key Program for Science and Technology Research and Development ; National Key Program for Science and Technology Research and Development ; Strategic Priority Program of the Chinese Academy of Sciences ; Strategic Priority Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/23345]
专题	中国科学院国家天文台
通讯作者	Yang, Lilan; Dai, Xinyu; Lu, Youjun
作者单位	1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China 2.Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Hubei, Peoples R China 3.Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 5.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 6.Univ Southampton, Dept Phys & Astron, Southampton SO17 1BJ, Hants, England
推荐引用方式 GB/T 7714	Yang, Lilan,Dai, Xinyu,Lu, Youjun,et al. Swift monitoring observations of Mrk 231: detection of ultraviolet variability[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,480(4):5504-5510.
APA	Yang, Lilan,Dai, Xinyu,Lu, Youjun,Zhu, Zong-Hong,&Shankar, Francesco.(2018).Swift monitoring observations of Mrk 231: detection of ultraviolet variability.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,480(4),5504-5510.
MLA	Yang, Lilan,et al."Swift monitoring observations of Mrk 231: detection of ultraviolet variability".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 480.4(2018):5504-5510.