Title: A Large-Scale Search for Photometrically Variable AGNs in Dwarf Galaxies Using the Young Supernova Experiment Show Chinese title

Title: 使用年轻超新星实验的大质量矮星系中光变活跃星系核的搜索

Abstract: We conduct an analysis of over 60,000 dwarf galaxies (7<=log(M_*/M_\odot)<=10) in search of photometric variability indicative of active galactic nuclei (AGNs). Using data from the Young Supernova Experiment (YSE), a time domain survey on the Pan-STARRS telescopes, we construct light curves for each galaxy in up to four bands (griz) where available. We select objects with AGN-like variability by fitting each light curve to a damped random walk (DRW) model. After quality cuts and removing transient contaminants, we identify 1100 variability-selected AGN candidates (representing 2.4% of the available sample). We analyze their spectra to measure various emission lines and calculate black hole (BH) masses, finding general agreement with previously found mass scaling-relations and nine potential IMBH candidates. Furthermore, we re-analyze the light curves for our candidates to calculate the dampening timescale tau_DRW associated with the DRW and see a similar correlation between this value and the BH mass. Finally, we estimate the active fraction as a function of stellar mass and see evidence that active fraction increases with host mass. Show Chinese abstract

Abstract: 我们分析了超过60,000个矮星系（7 <= log(M_*/M_\odot ) <= 10），寻找可能指示活动星系核（AGN）的光度变化。利用来自年轻超新星实验（YSE）的数据——这是Pan-STARRS望远镜的时间域巡天项目，我们为每个星系在最多四个波段（griz）中构建了光变曲线（如有可用）。通过将每个光变曲线拟合到阻尼随机游走（DRW）模型，我们选择了具有AGN类似变化的天体。经过质量筛选和去除瞬时污染后，我们确定了1100个由变异性选择的AGN候选体（占可用样本的2.4%）。我们分析它们的光谱以测量各种发射线并计算黑洞（BH）质量，发现与之前发现的质量标度关系总体一致，并发现了九个潜在的IMBH候选体。此外，我们重新分析了候选体的光变曲线，计算了与DRW相关的阻尼时间尺度tau_DRW，并观察到了这个值与BH质量之间的相似相关性。最后，我们估计了活动星系核的活动比例作为恒星质量的函数，并观察到活动比例随着宿主质量的增加而增加的证据。