COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XV. Assessing the achievability and precision of time-delay measurements
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses XV. Assessing the achievability and precision of time-delay measurements
复制标题
COSMOGRAIL：引力透镜的宇宙学监测 XV。
DOI：
10.1051/0004-6361/201526704
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
G. Meylan
中科院分区：
文献类型：
--
作者：
V. Bonvin;M. Tewes;F. Courbin;T. Kuntzer;D. Sluse;G. Meylan
COSMOGRAIL是对引力透镜类星体的长期光度监测，旨在实施雷夫达尔的时间延迟方法来测量宇宙学参数，特别是H0。由于强透镜类星体的光变曲线长且采样良好，时间延迟测量需要数值技术，其质量必须进行评估。为此，也考虑到未来的监测计划或调查（如LSST），2014年举办了名为时延挑战1（TDC1）的盲信号处理竞赛。本文的目的是双重的，这是基于模拟光变曲线从TDC1。首先，我们测试了目前在COSMOGRAIL中使用的时延测量技术的性能。其次，我们分析了从TDC1模拟中获得的时间延迟收获的数量和质量。为了实现这些目标，我们首先通过专用的视觉界面仔细检查光变曲线来发现时间延迟。我们的测量算法可以自动应用于数据。我们表明，我们的技术没有显着的偏差，并产生足够的不确定性估计，从而减少卡方值在0.5和1.0之间。我们提供的时间延迟测量的数量和精度，可以预期从未来的时间延迟监测活动作为一个功能的光度信噪比和真实的时间延迟的估计。我们公开了对TDC1数据的盲测
COSMOGRAIL is a long-term photometric monitoring of gravitationally lensed QSOs aimed at implementing Refsdal's time-delay method to measure cosmological parameters, in particular H0. Given long and well sampled light curves of strongly lensed QSOs, time-delay measurements require numerical techniques whose quality must be assessed. To this end, and also in view of future monitoring programs or surveys such as the LSST, a blind signal processing competition named Time Delay Challenge 1 (TDC1) was held in 2014. The aim of the present paper, which is based on the simulated light curves from the TDC1, is double. First, we test the performance of the time-delay measurement techniques currently used in COSMOGRAIL. Second, we analyse the quantity and quality of the harvest of time delays obtained from the TDC1 simulations. To achieve these goals, we first discover time delays through a careful inspection of the light curves via a dedicated visual interface. Our measurement algorithms can then be applied to the data in an automated way. We show that our techniques have no significant biases, and yield adequate uncertainty estimates resulting in reduced chi2 values between 0.5 and 1.0. We provide estimates for the number and precision of time-delay measurements that can be expected from future time-delay monitoring campaigns as a function of the photometric signal-to-noise ratio and of the true time delay. We make our blind measurements on the TDC1 data publicly available
质量片简并性、幂律模型和外部会聚：对通过引力透镜确定哈勃常数的影响
影响因子：
6.5
作者：
P. Schneider;D. Sluse
通讯作者：
D. Sluse
源位置变换：强引力透镜中的近似不变性
影响因子：
6.5
作者：
P. Schneider;D. Sluse
通讯作者：
D. Sluse