用罗伯特C.伯德格林班克望远镜
On Measuring Accurate 21-cm Line Profiles with the Robert C. Byrd Green Bank Telescope
摘要：
我们使用观测数据表明，21厘米线轮廓测量与绿岸望远镜（GBT）受到显着的不准确性。这些包括校准增益中的~10%误差和远距离旁瓣的显著贡献。此外，GBT和莱顿/阿根廷/波恩21厘米线轮廓强度之间存在约60%的变化，这可能是因为GBT的高主光束效率。来自GBT的斯托克斯V剖面包含与远侧旁瓣相关的不准确性。我们说明了这些问题，定义物理动机的旁瓣组件，并提供数值结果显示的不准确性。我们提供了一个校正方案斯托克斯我21厘米线轮廓，是相当成功的，并提供了一些经验法则的意见，斯托克斯V配置文件的准确性。
英文摘要：
We use observational data to show that 21 cm line profiles measured with the Green Bank Telescope (GBT) are subject to significant inaccuracy. These include ~10% errors in the calibrated gain and significant contribution from distant sidelobes. In addition, there are ~60% variations between the GBT and Leiden/Argentine/Bonn 21 cm line profile intensities, which probably occur because of the high main-beam efficiency of the GBT. Stokes V profiles from the GBT contain inaccuracies that are related to the distant sidelobes. We illustrate these problems, define physically motivated components for the sidelobes, and provide numerical results showing the inaccuracies. We provide a correction scheme for Stokes I 21 cm line profiles that is fairly successful and provide some rule-of-thumb comments concerning the accuracy of Stokes V profiles.
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