论文标题

从SDSS-V调查中鉴定出的14个新“更换式的'活性银河核的增生和宿主 - 盖亚特性

Accretion and Host-Galaxy Properties of 14 New "Changing-Look'' Active Galactic Nuclei Identified from the SDSS-V Survey

论文作者

Wang, J., Xu, D. W., Bai, J. Y., Brink, T. G., Gao, C., Zheng, W. K., Filippenko, A. V.

论文摘要

最近,通过发现以光谱型跃迁为特征的所谓的``更换外观''(CL)现象最近对广泛接受的活性银河核(AGN)范式进行了挑战。通过比较SDSS-V和SDSS DR16光谱数据集,我们在这里报告了14个新的Cl-Agns(Redshift $ z <0.5 $)的标识,这些cl-agns在$ \ sim 10 $ yr的时间表上显示了频谱类型的变化。使用Lick Shane 3M和Keck 10m望远镜进行了后续光谱,用于三个物体。对这些光谱的详细分析使我们能够得出以下两个主要结果。 (1)通过对65个Cl-agn的样本进行了良好的测量,我们加强了先前的说法,即Cl-agns倾向于与高爱丁顿的比率($ \ lyssim 0.1 $)和高杠体亮度和高差亮度($ \ lyssim 10^{46} {46}} \,\ nathrmmatrmmatrmmantrimementrimemitric unigrive($ \ simsim 0.1 $)}^$ 1}这种偏见表明,磁盘宽线区域模型是对CL现象的合理解释。 (2)CL-AGN的宿主星系倾向于以中级恒星种群为主,这激发了我们在特殊的进化阶段提出可能是特殊的AGN,例如从“ feast”到``feast''的过渡阶段到`'''''''''''''''''中等大型黑洞的燃料。此外,使用光谱,我们将SDSS j025951.22+003744.2识别为新的重复cl窄线seyfert 1 Galaxy,并具有快速的``thew-On-On-On-On-On''时间表的$ \ sim 1 $ yr。

The widely accepted active galactic nucleus (AGN) paradigm has been recently challenged by the discovery of the so-called ``changing-look'' (CL) phenomenon characterized by spectral-type transitions. By comparing the SDSS-V and SDSS DR16 spectroscopic datasets, here we report the identification of 14 new CL-AGNs (redshift $z<0.5$) exhibiting spectral-type changes on a timescale of $\sim 10$yr. Follow-up spectroscopy was conducted with the Lick Shane 3m and Keck 10m telescopes for three of the objects. Detailed analysis of these spectra enables us to arrive at the following two main results. (1) By compiling a sample of 65 CL-AGNs with good measurements, we reinforce the previous claim that CL-AGNs tend to be biased against both a high Eddington ratio ($\lesssim 0.1$) and a high bolometric luminosity ($\lesssim 10^{46}\,\mathrm{erg\,s^{-1}}$). This bias suggests that the disk-wind broad-line-region model is a plausible explanation of the CL phenomenon. (2) The host galaxies of CL-AGNs tend to be dominated by intermediate stellar populations, which motivates us to propose that CL-AGNs are probably particular AGNs at a special evolutionary stage, such as a transition stage from ``feast'' to ``famine'' fueling of the supermassive black hole. In addition, with our spectra, we identify SDSS J025951.22+003744.2 as a new repeat CL narrow-line Seyfert 1 galaxy with a rapid ``turn-on'' timescale of $\sim 1$yr.

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