论文标题
大天空模型的萨格赛表演
SAGECal performance with large sky models
论文作者
论文摘要
随着天文仪器变得更加敏感，校准软件的要求变得越来越严格。没有准确的校准解决方案，将无法达到图像中的热噪声水平，并且仪器的科学输出将降解。校准需要具有已知特性的明亮来源，特别是在其亮度作为频率方面的亮度。但是，对于具有巨大视野的现代射电望远镜而言，单个校准源不够。取而代之的是，需要数以万计的天空模型。在这项工作中，我们调查了如此复杂的天空模型的计算负载，最多可用于Sagecal校准套件。在这些模型中，我们选择了一半的来源是点源，其中一半是扩展的，我们由高斯配置文件代表。
As astronomical instruments become more sensitive, the requirements for the calibration software become more stringent; without accurate calibration solutions, thermal noise levels in images will not be reached and the scientific output of the instrument is degraded. Calibration requires bright sources with known properties, in particular with respect to their brightnesses as a function of frequency. However, for modern radio telescopes with a huge field of view, a single calibration source does not suffice; instead a sky model with tens of thousands of sources is needed. In this work, we investigate the compute load for such complicated sky models, with up to 50,000 sources, for the SAGECal calibration package. We have chosen half of the sources in these models to be point sources and half of them extended, which we represent by Gaussian profiles.
