WISE View of Changing-look Active Galactic Nuclei: Evidence for a Transitional Stage of AGNs
WISE View of Changing-look Active Galactic Nuclei: Evidence for a Transitional Stage of AGNs
复制标题
活动星系核外观变化的 WISE 视角：活动星系核过渡阶段的证据
DOI：
10.3847/1538-4357/ac5256
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Hao Liu
中科院分区：
文献类型：
--
作者：
Bing Lyu;Qingwen Wu;Zhen Yan;Wenfei Yu;Hao Liu
摘要。具有光学宽发射线（光学CLAGNs）显著变化和/或视距柱密度（x射线CLAGNs）强烈变化的活动星系核（CLAGNs）的发现挑战了基于取向的AGN统一模型。基于广域红外巡天探测器的档案数据，研究了57个光学clagn和11个x射线clagn的中红外特性。我们发现光学和x射线clagn的爱丁顿尺度中红外光度都介于低光度agn和发光qso之间。光学clagn和x射线clagn的平均eddington - scaling中红外光度分别为~ 0.4%和~ 0.5%，大致对应于辐射低效吸积流和shakula - sunyaev盘之间转换的热光度。我们估计了13个具有强中红外变异性的clagn的中红外变化的时间滞后于光学波段的时间滞后，其中clagn的时间滞后与热光度（τ-L）之间的紧密相关性大致与发光qso中的密切相关性一致。
Abstract. The discovery of changing-look active galactic nuclei (CLAGNs) with a significant change in optical broad emission lines (optical CLAGNs) and/or strong variation of line-of-sight column densities (X-ray CLAGNs) challenges the orientation-based AGN unification model. We explore mid-infrared (mid-IR) properties for a sample of 57 optical CLAGNs and 11 X-ray CLAGNs based on the Wide-field Infrared Survey Explorer archive data. We find that Eddington-scaled mid-IR luminosities of both optical and X-ray CLAGNs stay just between those of low-luminosity AGNs and luminous QSOs. The average Eddington-scaled mid-IR luminosities for optical and X-ray CLAGNs are ∼0.4% and ∼0.5%, respectively, which roughly correspond to the bolometric luminosity of transition between a radiatively inefficient accretion flow and a Shakura–Sunyaev disk. We estimate the time lags of the variation in the mid-IR behind that in the optical band for 13 CLAGNs with strong mid-IR variability, where the tight correlation between the time lag and the bolometric luminosity (τ–L) for CLAGNs roughly follows that found in the luminous QSOs.
DOI：
10.1017/cbo9781139109291.007
发表时间：
2013-09
期刊：
--
影响因子：
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作者：
H. Netzer
通讯作者：
H. Netzer
DOI：
--
发表时间：
2018-05
期刊：
--
影响因子：
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作者：
Mouyuan Sun;C. Grier;B. Peterson
通讯作者：
Mouyuan Sun;C. Grier;B. Peterson