论文标题
扩展W-CDF-S和SERV/SWIRE区域中主动银河核的变异性选择
Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region
论文作者
论文摘要
事实证明，可变性是检测多上述调查中活性银河核（AGN）的强大工具。预计将在未来几年内实现运营的新代设施将标志着时间域天文学的新时代，其宽场多上旁运动将有利于广泛的可变性研究。我们介绍了我们对宽Chandra Deep South（W-CDF-S）的VST调查的AGN变异性的分析，该调查在R频段中进行，覆盖2平方英尺。区域。该分析补充了先前的工作，其中研究了该地区的前半部分。我们提供可变的AGN候选者目录，这将是未来可变性研究的关键目标。我们选择了光学可变源的样本，并利用Spitzer任务中的红外数据来通过基于颜色的诊断来验证其性质。我们获得了782个AGN候选物的样本，其中12个被归类为超新星，54个恒星，232个为AGN。我们估计相对于中红外选定的样品，估计$ \ lyssim 20 \％$和完整性$ \ sim 38 \％$。
Variability has proven to be a powerful tool to detect active galactic nuclei (AGN) in multi-epoch surveys. The new-generation facilities expected to become operational in the next few years will mark a new era in time-domain astronomy and their wide-field multi-epoch campaigns will favor extensive variability studies. We present our analysis of AGN variability in the second half of the VST survey of the Wide Chandra Deep Field South (W-CDF-S), performed in the r band and covering a 2 sq. deg. area. The analysis complements a previous work, in which the first half of the area was investigated. We provide a reliable catalog of variable AGN candidates, which will be critical targets in future variability studies. We selected a sample of optically variable sources and made use of infrared data from the Spitzer mission to validate their nature by means of color-based diagnostics. We obtain a sample of 782 AGN candidates among which 12 are classified as supernovae, 54 as stars, and 232 as AGN. We estimate a contamination $\lesssim 20\%$ and a completeness $\sim 38\%$ with respect to mid-infrared selected samples.
