Four changing look active galactic nuclei found from optical variations

doi:10.1093/mnras/stae1044

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	Four changing look active galactic nuclei found from optical variations
	Zhu, Li-Tao 1; Li, Jie 2,3; Wang, Zhongxiang 1,4; Zhang JJ(张居甲)5,6
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2024-05-06
卷号	530 期号:4 页码:3538-3551
DOI	10.1093/mnras/stae1044
产权排序	第5完成单位
收录类别	SCI ; EI
关键词	galaxies: active quasars: emission lines
摘要	We report the finding of four changing look (CL) Active Galactic Nuclei (AGN). We selected these sources due to their potential as interesting targets when considering their relatively large optical flux variations and related mid-infrared flux variations. To identify their CL feature, we use archival spectra from the Sloan Digital Sky Survey (SDSS) taken at least 8 yr ago as well as spectra taken recently from the Transient Name Server (TNS) and with the 2.4-m LiJiang telescope (LJT). We study the sources' spectral changes by fitting and determining the H alpha and H beta components and verify their CL behaviour. When comparing the TNS and/or LJT spectra to the SDSS ones, all four sources showed the appearance of a broad or a stronger broad H alpha component and a relatively weak broad H beta component. As two of the four sources are established to have a brighter-and-bluer feature in the photometric data, during the time periods in which the TNS and LJT spectra were taken, this feature likely accompanied the turn-on of the broad components. Thus, we suggest that this brighter-and-bluer feature can be used as a criterion for efficiently finding CL sources among previously spectroscopically classified type 2 AGN, such as from among the sources provided by the SDSS.
资助项目	National Natural Science Foundation of China[AST-2034437]; National Science Foundation; Weizmann Institute for Science; Oskar Klein Center at Stockholm University; University of Maryland, Deutsches Elektronen-Synchrotron; TANGO Consortium of Taiwan; Lawrence Livermore National Laboratories; IN2P3, France
项目资助者	National Natural Science Foundation of China[AST-2034437] ; National Science Foundation ; Weizmann Institute for Science ; Oskar Klein Center at Stockholm University ; University of Maryland, Deutsches Elektronen-Synchrotron ; TANGO Consortium of Taiwan ; Lawrence Livermore National Laboratories ; IN2P3, France
语种	英语
学科领域	天文学 ; 星系与宇宙学
文章类型	Article
出版者	OXFORD UNIV PRESS
出版地	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN	0035-8711
URL	查看原文
WOS记录号	WOS:001214350900003
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	LOOK QUASARS ; VARIABILITY ; AGN ; CLASSIFICATION ; DISCOVERY ; GALAXIES ; SEARCH ; LINER ; BROAD ; UV
EI入藏号	20242016080164
EI主题词	Active Galactic Nuclei
EI分类号	657.2 Extraterrestrial Physics and Stellar Phenomena
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27179
专题	南方基地中国科学院天体结构与演化重点实验室
作者单位	1.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, China; 2.Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230036, China; 3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; 4.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; 5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; 6.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
推荐引用方式 GB/T 7714	Zhu, Li-Tao,Li, Jie,Wang, Zhongxiang,et al. Four changing look active galactic nuclei found from optical variations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2024,530(4):3538-3551.
APA	Zhu, Li-Tao,Li, Jie,Wang, Zhongxiang,&张居甲.(2024).Four changing look active galactic nuclei found from optical variations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,530(4),3538-3551.
MLA	Zhu, Li-Tao,et al."Four changing look active galactic nuclei found from optical variations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 530.4(2024):3538-3551.

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