Galactic and Extragalactic Effelsberg 21-cm multi-feed survey

我们建议进行一次Effelsberg HI测量，在全采样网格上覆盖Dec=0°以北的整个北部天空。使用两个不同的光谱仪后端，我们第一次并行执行了银河系和银河系外的调查。对于斯隆数字天空勘测区，探测经过优化，达到了2mJy/B.A.的最高灵敏度；这相当于处女座星系团距离处的质量灵敏度为1.8-107mSun。银河系调查将与帕克斯·加斯调查的北部延伸部分有足够的重叠，但将具有更高的灵敏度。因此，埃菲尔斯伯格和伽斯测量的结合将成为多频率天文学的数据来源，直到平方千米阵列时代。Effelsberg HI测量是阿尔格兰德天文学研究所(ALFA)和马克斯普朗克射电天文学研究所(MPIfR)的联合项目。该项目位于阿尔法，而MPIfR提供了访问仪器的途径。

We propose to perform an Effelsberg HI survey which covers the whole northern sky north of Dec = 0° on a fully sampled grid. Using two different spectrometer backends, we perform for the first time a galactic and extragalactic survey in parallel. Towards the Sloan Digital Sky Survey area the survey is optimized to reach its highest sensitivity of 2 mJy/b.a.; this corresponds to a mass sensitivity of 1.8-107 Msun at the distance of the Virgo cluster. The Milky Way survey will have a sufficient overlap with the northern extension of the Parkes GASS survey but will have much higher sensitivity. Accordingly, the Effelsberg and GASS survey combined will be the data resource for multi-frequency astronomy until the era of the Square Kilometer Array. The Effelsberg HI survey is a joint project between the Argelander-lnstitut für Astronomie (AlfA) and the Max-Planck-lnstitut für Radioastronomie (MPIfR). The project is located at AlfA, while the MPIfR provides the access to the instrument.