论文标题
AGN可变性的观察性非组织性：唯一要走的方法就是下降！
Observational nonstationarity of AGN variability: The only way to go is down!
论文作者
论文摘要
为了洞悉长期活性银河核（AGN）的可变性，我们分析了Sloan数字天空调查（SDSS）中的AGN样本，并将其光度计与观察到的$ \ langle 14.85 \ langle $ frow sdss SDS $ hears SDS SDS的观察结果进行比较。平均而言，AGN在HSC中比SDSS薄弱。我们证明差异不是由于SDSS与HSC过滤器或光度法的细微差异所致。平均亮度的下降取决于红移，这与对观测值之间剩余时间分离的变化的期望一致。在给定的红移下，对于更发光的AGN，亮度的平均降低更强，对于测量值之间的时间较长的对象。我们证明，对测得的平均亮度降低的红移和光度的依赖性与长期（Myr，Gyr）时标AGN的Eddington比率变异性的简单模型一致。我们展示了如何使用结果来限制AGN种群的可变性和人口特性。
To gain insights into long-term Active Galactic Nuclei (AGN) variability, we analyze an AGN sample from the Sloan Digital Sky Survey (SDSS) and compare their photometry with observations from the Hyper Suprime-Cam survey (HSC) observed $\langle 14.85 \rangle$ years after SDSS. On average, the AGN are fainter in HSC than SDSS. We demonstrate that the difference is not due to subtle differences in the SDSS versus HSC filters or photometry. The decrease in mean brightness is redshift dependent, consistent with expectations for a change that is a function of the rest-frame time separation between observations. At a given redshift, the mean decrease in brightness is stronger for more luminous AGN and for objects with longer time separation between measurements. We demonstrate that the dependence on redshift and luminosity of measured mean brightness decrease is consistent with simple models of Eddington ratio variability in AGN on long (Myr, Gyr) timescales. We show how our results can be used to constrain the variability and demographic properties of AGN populations.
