High-resolution imaging follow-up of doubly imaged quasars

High-resolution imaging follow-up of doubly imaged quasars
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双成像类星体的高分辨率成像跟踪

DOI:
10.1093/mnras/stab532
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发表时间:
2021
影响因子:
4.8
通讯作者:
Schechter, Paul L
Schechter, Paul L
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Shajib, Anowar J;Molina, Eden;Agnello, Adriano;Williams, Peter R;Birrer, Simon;Treu, Tommaso;Fassnacht, Christopher D;Morishita, Takahiro;Abramson, Louis;Schechter, Paul L

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我们报告了通过2016年至2018年的近红外相机2(NIRC 2)成像活动对双重成像类星体透镜进行的3年随访和确认。M.凯克天文台。对57个类星体候选透镜样品进行了自适应光学辅助或视宁度限制K ′波段观测成像。在这57个候选者中,15个被确认为镜片。我们形成了一个20个镜头的样本,添加了一些以前已知的镜头,这些镜头在2013-14年作为试点研究的一部分使用NIRC 2成像。通过对这20个透镜的模拟,我们得到了类星体像和透镜星系的K ′波段相对测光和天体测量。我们还提供了透镜的属性和预测的时间延迟,以帮助规划后续观测所需的各种天体物理应用,例如光谱后续获得偏转红移的新确认的系统。我们比较了观测到的流量比从光滑模型预测的双重和四重成像类星体系统之间的偏离。我们发现,这两种类型的镜头之间的偏离是一致的,如果建模的不确定性是可比的。
We report upon 3 years of follow-up and confirmation of doubly imaged quasar lenses through imaging campaigns from 2016 to 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-limitedK′-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 obtainK′-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.
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