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arXiv 2202.02718astro-ph.HE
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变貌活动星系核的WISE观点：活动星系核过渡阶段的证据

WISE view of changing-look AGNs: evidence for a transitional stage of AGNs

Lyu Bing, Wu Qingwen, Yan Zhen, Yu Wenfei, Liu Hao

备注：
18 pages, accepted in APJ
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摘要：

随着光学宽发射线（optical broad emission lines，optical CLAGN）和/或视线柱密度（line-of-sight column density，X-ray CLAGN）的显著变化，活动星系核（active galactic nucleus，CLAGN）外观变化的发现对基于方位的活动星系核统一模型提出了挑战。基于{ \it WISE}（{ \it WISE}）存档数据，我们探索了57个光学CLAGN和11个X射线CLAGN的中红外（中红外）特性。我们发现，爱丁顿标度的光学和X射线CLAGN的中红外光度停留在低光度活动星系核（LLAGN）和发光类星体之间。光学和X射线CLAGN的平均Eddington标度的中红外光度分别为$\sim 0.4$ \%和$\sim 0.5$ \%，这大致对应于辐射低效吸积流（RIAF）和Shakura-Sunyaev盘（SSD）之间过渡的热光度。我们估计了13个具有强中红外变化的CLAGN的中红外变化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遵循在发光类星体中发现的。

英文摘要：

The discovery of changing-look active galactic nuclei (CLAGNs) with the significant change of 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 {\it Wide-field Infrared Survey Explorer} ({\it WISE}) archive data. We find that Eddington-scaled mid-IR luminosities of both optical and X-ray CLAGNs stay just between low-luminosity AGNs (LLAGNs) and luminous QSOs. The average Eddington-scaled mid-IR luminosities for optical and X-ray CLAGNs are $\sim 0.4$\% and $\sim 0.5$\%, respectively, which roughly correspond the bolometric luminosity of transition between a radiatively inefficient accretion flow (RIAF) and Shakura-Sunyaev disk (SSD). 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.

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