Measuring gravitational lens time delays using low-resolution radio monitoring observations
Measuring gravitational lens time delays using low-resolution radio monitoring observations
复制标题
使用低分辨率无线电监测观测测量引力透镜时间延迟
DOI：
10.1093/mnras/stu557
复制
发表时间：
2014
影响因子：
4.8
通讯作者：
A. B. Alba
中科院分区：
文献类型：
--
作者：
G. Gürkan;G. Gürkan;N. Jackson;L. Koopmans;C. Fassnacht;A. B. Alba
获得透镜时间延迟测量需要具有足够高的分辨率（<1弧秒）的长期监测活动来分离多个图像。在无线电中，有限数量的高分辨率干涉仪阵列使得这些观测很难安排。为了克服这个问题，我们提出了一种测量引力时间延迟的技术，该技术依赖于用低分辨率但高灵敏度的射电望远镜监测总通量密度，以跟踪较亮图像的变化。然后，这被用来触发高分辨率的观测，以最优的数量，然后揭示微弱图像的变化。我们提出了模拟来评估这种方法的效率，并结合了一个试点项目，用韦斯特伯克综合射电望远镜观测射电透镜系统，以触发甚大阵列观测。这种新方法有望用于测量时间延迟，因为它在高分辨率望远镜上使用的时间相对较少。这将是重要的，因为具有高灵敏度但分辨率有限的仪器，以及适当的射电望远镜后续高分辨率观测的最佳使用，可能在未来通过这种新方法对引力透镜时间延迟测量有用。
Obtaining lensing time-delay measurements requires long-term monitoring campaigns with a high enough resolution (<1 arcsec) to separate the multiple images. In the radio, a limited number of high-resolution interferometer arrays make these observations difficult to schedule. To overcome this problem, we propose a technique for measuring gravitational time delays which relies on monitoring the total flux density with low-resolution but high-sensitivity radio telescopes to follow the variation of the brighter image. This is then used to trigger high-resolution observations in optimal numbers which then reveal the variation in the fainter image. We present simulations to assess the efficiency of this method together with a pilot project observing radio lens systems with the Westerbork Synthesis Radio Telescope to trigger Very Large Array observations. This new method is promising for measuring time delays because it uses relatively small amounts of time on high-resolution telescopes. This will be important because instruments that have high sensitivity but limited resolution, together with an optimum usage of follow-up high-resolution observations from appropriate radio telescopes may in the future be useful for gravitational lensing time-delay measurements by means of this new method.
影响因子：
6.5
作者：
van Haarlem, M. P.;Wise, M. W.;van Zwieten, J.
通讯作者：
van Zwieten, J.