论文标题
确认新的变化 - 通过使用基于随机孔的光曲线分类器通过光学变异发现发现的新变化 -
Confirming new changing--look AGNs discovered through optical variability using a random-forest based light curve classifier
论文作者
论文摘要
确定变化的频率和持续时间 - （Cl）活性银河核（AGNS）现象，即光宽发射线出现或消失，对于理解超质量黑洞围绕增生流的演变至关重要。我们提出了一种策略，可以选择从光谱类型2 AGNS样本开始的新CL候选物，并搜索当前类型1的光度变异性。我们使用公开可用的Zwicky瞬态设施（ZTF）警报流和自动学习，以快速的事件分类（Alerce）光曲线分类器来生成具有高度自动化算法的CL候选者列表，从而导致60个候选者。视觉检查将样品降低到30。我们对清洁样品的六个候选者进行了新的光谱观测，而没有进一步的细化，发现了其中四个候选者的出现，并在其中四个中出现了透明的宽Balmer线，并在其余两种中进行了类型变化的暂定证据，这表明该CL选择方法的$ \ egeq66 $ $ \ geqq66 $。
Determining the frequency and duration of changing--look (CL) active galactic nuclei (AGNs) phenomena, where the optical broad emission lines appear or disappear, is crucial to understand the evolution of the accretion flow around supermassive black holes. We present a strategy to select new CL candidates starting from a spectroscopic type 2 AGNs sample and searching for current type 1 photometric variability. We use the publicly available Zwicky Transient Facility (ZTF) alert stream and the Automatic Learning for the Rapid Classification of Events (ALeRCE) light curve classifier to produce a list of CL candidates with a highly automated algorithm, resulting in 60 candidates. Visual inspection reduced the sample to 30. We performed new spectroscopic observations of six candidates of our clean sample, without further refinement, finding the appearance of clear broad Balmer lines in four of them and tentative evidence of type changes in the remaining two, which suggests a promising success rate of $\geq66$ per cent for this CL selection method.
