Doubly Imaged Quasar SDSS J1515+1511: Time Delay and Lensing Galaxies
Doubly Imaged Quasar SDSS J1515+1511: Time Delay and Lensing Galaxies
复制标题
双像类星体 SDSS J1515 1511：时间延迟和透镜星系
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. Goicoechea
中科院分区：
文献类型：
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作者：
V. Shalyapin;L. Goicoechea
我们分析了引力透镜系统SDSS J1515+1511的新光学观测结果。其中包括用利物浦望远镜（LT）在r波段进行为期2.6年的光度监测，以及用LT和加那利大望远镜（GTC）进行的光谱跟踪。我们的r波段LT光曲线覆盖了双成像类星体在2.049处的静止微透镜期，这使得我们可以稳健地估计出两幅图像a和B之间的时间延迟：211±5天（1σ置信区间，a领先）。不幸的是，主透镜星系（G1）非常微弱，而且离明亮的类星体很近，因此无法通过GTC数据准确提取其光谱。然而，假设红移= 0.742，我们使用遥远类星体的GTC和LT光谱来讨论G1中的宏观透镜放大、消光和微透镜效应。对时间延迟和宏透镜放大比的新约束基本没有改变先前在G1和外剪切质量尺度上的发现，而透镜质量的红移与假设值一致。这清楚地证明G1确实位于= 0.742。从GTC数据中，我们还获得了另外两个天体（次级星系G2和一个新的吸收系统）的红移，并讨论了它们在透镜场景中的可能作用。
We analyze new optical observations of the gravitational lens system SDSS J1515+1511. These include a 2.6-year photometric monitoring with the Liverpool Telescope (LT) in the r band, as well as a spectroscopic follow-up with the LT and the Gran Telescopio Canarias (GTC). Our r-band LT light curves cover a quiescent microlensing period of the doubly imaged quasar at = 2.049, which permits us to robustly estimate the time delay between the two images A and B: 211 ± 5 days (1σ confidence interval; A is leading). Unfortunately, the main lensing galaxy (G1) is so faint and close to the bright quasar that it is not feasible to accurately extract its spectrum through the GTC data. However, assuming the putative redshift = 0.742, the GTC and LT spectra of the distant quasar are used to discuss the macrolens magnification, and the extinction and microlensing effects in G1. The new constraints on the time delay and macrolens magnification ratio essentially do not change previous findings on the mass scale of G1 and external shear, while the redshift of the lensing mass is found to be consistent with the assumed value of . This is clear evidence that G1 is indeed located at = 0.742. From the GTC data, we also obtain the redshift of two additional objects (the secondary galaxy G2 and a new absorption system) and discuss their possible roles in the lens scenario.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.