Effelsberg-Bonn HI调查（EBHIS）的数据简化战略
Data reduction strategy of the Effelsberg-Bonn HI Survey (EBHIS)
摘要：
自2008年秋季以来，一个新的L波段7馈源阵列接收器被用于100米埃费尔斯堡望远镜进行的HI 21厘米线测量。调查将覆盖整个北半球，包括银河和河外天空。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方面具有优越性，允许将复杂的射频干扰（RFI）缓解方案应用于调查数据。EBHIS数据处理软件包括RFI抑制、增益曲线校正、强度校准、杂散辐射校正、网格化和源检测。我们讨论了严重退化的射电天文HI数据RFI信号和增益的科学产量时，应用现代RFI缓解计划。为此，在有和没有RFI退化的情况下，对局部体积（z<0.07）内的星系分布进行了模拟。这些模拟使我们能够研究数据简化软件和应用的源参数化方法引入的潜在偏差和选择效应。
英文摘要：
Since autumn 2008 a new L-band 7-Feed-Array receiver is used for an HI 21-cm line survey performed with the 100-m Effelsberg telescope. The survey will cover the whole northern hemisphere comprising both, the galactic and extragalactic sky in parallel. Using state-of-the-art FPGA based digital Fast Fourier Transform spectrometers, superior in dynamic range and temporal resolution, allows to apply sophisticated radio frequency interferences (RFI) mitigation schemes to the survey data. The EBHIS data reduction software includes the RFI mitigation, gain-curve correction, intensity calibration, stray-radiation correction, gridding, and source detection. We discuss the severe degradation of radio astronomical HI data by RFI signals and the gain in scientific yield when applying modern RFI mitigation schemes. For this aim simulations of the galaxy distribution within the local volume (z<0.07) with and without RFI degradation were performed. These simulations, allow us to investigate potential biases and selection effects introduced by the data reduction software and the applied source parametrization methods.
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