COSMOGRAIL: XVIII. time delays of the quadruply lensed quasar WFI2033−4723
COSMOGRAIL: XVIII. time delays of the quadruply lensed quasar WFI2033−4723
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Cosmograil：十八。
DOI：
10.1051/0004-6361/201935921
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发表时间：
2019
影响因子：
6.5
通讯作者：
Marshall, P. J.
中科院分区：
文献类型：
--
作者：
Bonvin, V.;Millon, M.;Chan, J. H.-H.;Courbin, F.;Rusu, C. E.;Sluse, D.;Suyu, S. H.;Wong, K. C.;Fassnacht, C. D.;Marshall, P. J.
我们提出了WFI2033-4723的时间延迟的新测量。这项工作中使用的数据集包括14年的1.2米莱昂哈德欧拉瑞士望远镜的数据，13年的Las Campanas天文台的SMARTS 1.3米望远镜的数据，以及一年的MPIA 2.2米望远镜的高节奏和高精度监测数据。从这些不同的数据集测量到的时间延迟，都是在r波段，彼此之间以及与文献中先前的测量结果都很一致。结合我们数据集的所有延迟估计结果，Delta t (AB)= 36.2(-0.8)（+ 0.7）天（2.1%精度），Delta t (AC)= 23.3(-1.4)（+ 1.2）天（5.6%）和Delta t (BC)= 59.4(-1.3)（+ 1.3）天（2.2%）。此外，在MPIA 2.2 m数据中可以分辨出透镜类星体的近距离像对A1-A2。我们在这对图像中测量到一个与零一致的时间延迟。我们还探讨了可能影响WFI2033-4723宇宙学时延测量的微透镜时延的先验分布。我们的时间延迟测量不够精确，无法得出微透镜时间延迟存在或不存在的结论。这项工作是hollicow系列的一部分，重点是测量来自WFI2033-4723的哈勃常数。
We present new measurements of the time delays of WFI2033-4723. The data sets used in this work include 14 years of data taken at the 1.2 m Leonhard Euler Swiss telescope, 13 years of data from the SMARTS 1.3 m telescope at Las Campanas Observatory and a single year of high-cadence and high-precision monitoring at the MPIA 2.2 m telescope. The time delays measured from these different data sets, all taken in the R-band, are in good agreement with each other and with previous measurements from the literature. Combining all the time-delay estimates from our data sets results in Delta t (AB)= 36.2 (-0.8)(+ 0.7) days (2.1% precision), Delta t (AC)= 23.3 (-1.4)(+ 1.2) days (5.6%) and Delta t (BC)= 59.4 (-1.3)(+ 1.3) days (2.2%). In addition, the close image pair A1-A2 of the lensed quasars can be resolved in the MPIA 2.2 m data. We measure a time delay consistent with zero in this pair of images. We also explore the prior distributions of microlensing time-delay potentially affecting the cosmological time-delay measurements of WFI2033-4723. Our time-delay measurements are not precise enough to conclude that microlensing time delay is present or absent from the data. This work is part of a H0LiCOW series focusing on measuring the Hubble constant from WFI2033-4723.