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 6; Li, Jie 4,5; Wang, Zhongxiang 3,6; Zhang JJ(张居甲)1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2024-05-06
卷号	530 期号:4 页码:3538-3551
关键词	galaxies: active quasars: emission lines
ISSN号	0035-8711
DOI	10.1093/mnras/stae1044
产权排序	第5完成单位
文献子类	Article
英文摘要	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.
学科主题	天文学 ; 星系与宇宙学
URL标识	查看原文
出版地	GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
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
WOS关键词	LOOK QUASARS ; VARIABILITY ; AGN ; CLASSIFICATION ; DISCOVERY ; GALAXIES ; SEARCH ; LINER ; BROAD ; UV
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:001214350900003
资助机构	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
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ynao.ac.cn/handle/114a53/27179]
专题	云南天文台_丽江天文观测站（南方基地）
作者单位	1.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; 4.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, China; 5.Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230036, China; 6.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, 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.