论文标题
双重成像类星体的高分辨率成像随访
High-resolution imaging follow-up of doubly imaged quasars
论文作者
论文摘要
我们通过2016 - 2018年的成像运动进行了三年的随访和对偶发成像的类星体镜头的确认，并在W. M. Keck天文台上使用了近红外摄像头2（NIRC2）。在自适应 - 镜头辅助或观看限制的$ k^\ prime $ band观测中，将成像57个类星体镜头的样本。在这57名候选人中，有15名被确认为镜头。我们形成了20个镜片的样本，其中添加了许多先前已知的镜头，这些镜片是在2013 - 14年度用Nirc2成像的，作为试点研究的一部分。通过对这20个镜头进行建模，我们获得了$ k^\ prime $ - 带相对光度法和类星体图像和镜头银河系的天体。我们还提供了镜头属性和预测的时间延迟，以帮助计划各种天体物理应用所需的后续观测值，例如光谱随访，以获取新确认的系统的偏转器红移。我们比较了观察到的通量比从双重和四倍成像的类星体系统之间的平滑模型预测的偏离。我们发现，如果建模不确定性可比性，则这两种类型的镜头之间的偏离是一致的。
We report upon three years of follow-up and confirmation of doubly imaged quasar lenses through imaging campaigns from 2016-2018 with the Near-Infrared Camera2 (NIRC2) on the W. M. Keck Observatory. A sample of 57 quasar lens candidates are imaged in adaptive-optics-assisted or seeing-limited $K^\prime$-band observations. Out of these 57 candidates, 15 are confirmed as lenses. We form a sample of 20 lenses adding in a number of previously-known lenses that were imaged with NIRC2 in 2013-14 as part of a pilot study. By modelling these 20 lenses, we obtain $K^\prime$-band relative photometry and astrometry of the quasar images and the lens galaxy. We also provide the lens properties and predicted time delays to aid planning of follow-up observations necessary for various astrophysical applications, e.g., spectroscopic follow-up to obtain the deflector redshifts for the newly confirmed systems. We compare the departure of the observed flux ratios from the smooth-model predictions between doubly and quadruply imaged quasar systems. We find that the departure is consistent between these two types of lenses if the modelling uncertainty is comparable.
