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Accretion-regulated Type Transitions in Changing-look AGNs: Evidence from Two-epoch Spectral Analysis

文献类型：期刊论文

作者Shen YH(沈宇恒)1,2,4; Lu KX(卢开兴)1,2,4; Guo, Wei-Jian3; Li SS(李莎莎)1,4; Feng HC(封海成)1,4; Yue Z(岳章)1,2,4; Xi WZ(席文哲)1,2,4; Wang JG(王建国)1,4; Bai JM(白金明)1,2,4
刊名ASTROPHYSICAL JOURNAL
出版日期2025-12-01
卷号994期号:2
ISSN号0004-637X
DOI10.3847/1538-4357/ae1299
产权排序第1完成单位
文献子类Article
英文摘要The changing-look active galactic nucleus (CL-AGN), an extraordinary subpopulation of supermassive black holes, has attracted growing attention to understand its nature. We present an analysis of the spectral properties of 203 low-redshift CL-AGNs (z < 0.35) using two-epoch spectra from Sloan Digital Sky Survey DR16 and DESI DR1 with time baseline ranging from similar to 1000 to 8000 days, based on spectral fitting and decomposition. The sample consists of 11.3% type 1.0, 26.6% type 1.2, 43.1% type 1.5, and 19% type 1.8/2.0 AGNs. The total sample is divided into two data sets: Data Set A (110 objects) with minor spectral type variations, likely general AGN variability, and Data Set B (93 objects) showing significant type transitions and characteristic turn-on or turnoff behavior. Our results reveal clear optical continuum and emission-line variability, showing both bluer-when-brighter and redder-when-brighter trends. A strong correlation between the broad H beta/[O III] ratio and broad H alpha luminosity (L-H alpha), log(H beta/[OIII])= (0.63 +/- 0.07)log(L-H alpha)- (26.49 +/- 2.96) +/- 0.48 for Data Set B, as well as the correlation between H beta/[O III] and Eddington ratio (L-bol/L-Edd), log(H beta/[OIII])= (0.59 +/- 0.08)log(L-bol/L-Edd)+ (1.02 +/- 0.15) +/- 0.53 for Data Set B, suggests that accretion rate variations drive changes in ionizing flux within the broad-line region, thereby triggering AGN type transitions. These findings underscore the critical role of supermassive black hole accretion processes in refining the AGN unification model. Future work should investigate potential connections between stellar evolution in outer accretion disk and the observed scatter in these correlations.
学科主题天文学 ; 天体物理学 ; 高能天体物理学 ; 星系与宇宙学
URL标识查看原文
出版地No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND
WOS关键词ACTIVE GALACTIC NUCLEI ; BROAD-LINE REGION ; SUPERMASSIVE BLACK-HOLES ; REFERENCE SURVEY CARS ; H-ALPHA ; LUMINOSITY END ; MAIN-SEQUENCE ; EIGENVECTOR 1 ; LONG-TERM ; VARIABILITY
资助项目National Key R&D Program of China[2021YFA1600404]; National Natural Science Foundation of China[NSFC-12573020]; National Natural Science Foundation of China[12073068]; National Natural Science Foundation of China[11703077]; National Natural Science Foundation of China[11873048]; National Natural Science Foundation of China[11991051]; Young Talent Project of Yunnan Province; Youth Innovation Promotion Association of Chinese Academy of Sciences[2022058]; Yunnan Province Foundation; Chinese Academy of Sciences[Y7XB016001]; China Manned Space Project[CMS-CSST-2025-A07]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001626485100001
出版者IOP Publishing Ltd
资助机构National Key R&D Program of China[2021YFA1600404] ; National Natural Science Foundation of China[NSFC-12573020, 12073068, 11703077, 11873048, 11991051] ; Young Talent Project of Yunnan Province ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2022058] ; Yunnan Province Foundation ; Chinese Academy of Sciences[Y7XB016001] ; China Manned Space Project[CMS-CSST-2025-A07]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/28765]  
专题云南天文台_丽江天文观测站（南方基地）
通讯作者Lu KX(卢开兴)
作者单位1.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China;
2.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China;
3.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, People’s Republic of China; guowj@bao.ac.cn
4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People’s Republic of China; lukx@ynao.ac.cn;
推荐引用方式
GB/T 7714		 Shen YH,Lu KX,Guo, Wei-Jian,et al. Accretion-regulated Type Transitions in Changing-look AGNs: Evidence from Two-epoch Spectral Analysis[J]. ASTROPHYSICAL JOURNAL,2025,994(2).
APA 沈宇恒.,卢开兴.,Guo, Wei-Jian.,李莎莎.,封海成.,...&白金明.(2025).Accretion-regulated Type Transitions in Changing-look AGNs: Evidence from Two-epoch Spectral Analysis.ASTROPHYSICAL JOURNAL,994(2).
MLA 沈宇恒,et al."Accretion-regulated Type Transitions in Changing-look AGNs: Evidence from Two-epoch Spectral Analysis".ASTROPHYSICAL JOURNAL 994.2(2025).

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