Strong lensed QSOs with variability detectable by LSST: How many are there?
Strong lensed QSOs with variability detectable by LSST: How many are there?
复制标题
LSST 可检测到具有可变性的强透镜 QSO：有多少个？
DOI：
10.1093/mnras/stad2201
复制
发表时间：
2023
影响因子：
4.8
通讯作者：
Treu, Tommaso
中科院分区：
文献类型：
--
作者：
Taak, Yoon Chan;Treu, Tommaso
强透镜类星体（QSO）在许多方面都是探索宇宙的重要工具。这些应用中的两个，混响映射和测量时间延迟，以确定宇宙学参数，要求源类星体是可变的足够的振幅。在本文中，我们预测的强透镜类星体的数量有足够的变化，以检测的维拉C。Rubin Telescope Legacy Survey of Space and Time（鲁宾望远镜遗产空间和时间巡天）本文用阻尼随机游走模型模拟了Oguri &马歇尔的模拟星表中透镜类星体的变率振幅。我们预计30%-40%的模拟透镜类星体样本，相当于10000，表现出可检测的LSST的变化。一个较小的250个透镜类星体的子样本将显示出大于0.15等的较大变化，对于i < 21等的明亮透镜图像，允许用较小的望远镜进行监测。我们讨论了系统的不确定性预测考虑替代处方的变化和模拟透镜目录相对于我们的基准模型。我们的研究表明，大规模的调查透镜类星体可以进行混响映射和时间延迟测量后续LSST。
Strong lensed quasi-stellar objects (QSOs) are valuable probes of the Universe in numerous aspects. Two of these applications, reverberation mapping and measuring time delays for determining cosmological parameters, require the source QSOs to be variable with sufficient amplitude. In this paper, we forecast the number of strong lensed QSOs with sufficient variability to be detected by the Vera C. Rubin Telescope Legacy Survey of Space and Time (LSST). The damped random walk model is employed to model the variability amplitude of lensed QSOs taken from a mock catalogue by Oguri & Marshall . We expect 30–40 per cent of the mock lensed QSO sample, which corresponds to ∼1000, to exhibit variability detectable with LSST. A smaller subsample of 250 lensed QSOs will show larger variability of >0.15 mag for bright lensed images withi< 21 mag, allowing for monitoring with smaller telescopes. We discuss systematic uncertainties in the prediction by considering alternative prescriptions for variability and mock lens catalogue with respect to our fiducial model. Our study shows that a large-scale survey of lensed QSOs can be conducted for reverberation mapping and time delay measurements following up on LSST.