Effelsberg-Bonn HI调查：数据简化
The Effelsberg-Bonn HI Survey: Data reduction
摘要：
从2008/2009年冬季开始，使用L波段7馈源阵列接收器，用100米望远镜进行21厘米线测量，即Effelsberg-Bonn HI测量。EBHIS将覆盖整个北半球的12月。5度，包括银河系和河外天空，距离约230 Mpc。使用最先进的基于FPGA的数字快速傅里叶变换光谱仪，在动态范围和时间分辨率优于传统的频谱仪，使我们能够应用复杂的射频干扰（RFI）缓解方案。在本文中，EBHIS数据简化包和第一个结果。简化软件包括RFI探测方案、通量和增益曲线校准、杂散辐射去除、基线拟合，最后是网格化以产生数据立方体。整个软件链成功地测试使用多馈数据对许多较小的测试领域（1- 100平方度），最近首次应用到两个大的天空区域，每个覆盖约2000平方度的数据。第一个大的区域是朝向银河系北极，第二个朝向麦哲伦引导臂的北端。在这里，我们展示了EBHIS银河系数据的数据质量，并在2011年首次发布的数据上给人留下了第一印象。
英文摘要：
Starting in winter 2008/2009 an L-band 7-Feed-Array receiver is used for a 21-cm line survey performed with the 100-m telescope, the Effelsberg-Bonn HI survey (EBHIS). The EBHIS will cover the whole northern hemisphere for decl.>-5 deg comprising both the galactic and extragalactic sky out to a distance of about 230 Mpc. Using state-of-the-art FPGA-based digital fast Fourier transform spectrometers, superior in dynamic range and temporal resolution to conventional correlators, allows us to apply sophisticated radio frequency interference (RFI) mitigation schemes. In this paper, the EBHIS data reduction package and first results are presented. The reduction software consists of RFI detection schemes, flux and gain-curve calibration, stray-radiation removal, baseline fitting, and finally the gridding to produce data cubes. The whole software chain is successfully tested using multi-feed data toward many smaller test fields (1--100 square degrees) and recently applied for the first time to data of two large sky areas, each covering about 2000 square degrees. The first large area is toward the northern galactic pole and the second one toward the northern tip of the Magellanic Leading Arm. Here, we demonstrate the data quality of EBHIS Milky Way data and give a first impression on the first data release in 2011.
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