HI4PI: a full-sky H I survey based on EBHIS and GASS
HI4PI: a full-sky H I survey based on EBHIS and GASS
复制标题
DOI：
10.1051/0004-6361/201629178
复制
发表时间：
2016-10-01
影响因子：
6.5
通讯作者：
Staveley-Smith, L.
中科院分区：
文献类型：
--
作者：
Ben Bekhti, N.;Floer, L.;Staveley-Smith, L.
上下文测量银河中性氢（H I）柱密度（NH I）和亮度温度（T-B），对于广泛的天体物理学科具有很高的科学价值。在过去的二十年里，最常用的传统H I数据集之一是莱顿/阿根廷/波恩调查（LAB）。我们发布了H I 4 pi巡天（HI 4PI），这是一个全天空的银河H I数据库，它取代了LAB巡天。HI 4PI巡天是基于最近完成的Effelsberg-Bonn H I巡天（EBHIS）第一次覆盖范围和银河系全天巡天（GASS）第三次修订的数据。EBHIS和GASS具有相似的角分辨率，并且在灵敏度上匹配良好。结合起来，它们非常适合成为LAB. Results的继任者。新的HI 4PI测量在角分辨率（theta（FWHM）= 16 '.2）和灵敏度（sigma（rms）= 43 mK）方面优于LAB。此外，它具有完整的空间采样，从而克服了LAB的一个主要缺点，即严重欠采样的天空。我们发布了银河系中性氢原子的全天柱密度图，沿着完整的光谱数据，包括HEALPix在内的几个地图投影。
Context. Measurement of the Galactic neutral atomic hydrogen (H I) column density, NH I, and brightness temperatures, T-B, is of high scientific value for a broad range of astrophysical disciplines. In the past two decades, one of the most-used legacy H I datasets has been the Leiden/Argentine/Bonn Survey (LAB).Aims. We release the H I 4 pi survey (HI4PI), an all-sky database of Galactic H I, which supersedes the LAB survey.Methods. The HI4PI survey is based on data from the recently completed first coverage of the Effelsberg-Bonn H I Survey (EBHIS) and from the third revision of the Galactic All-Sky Survey (GASS). EBHIS and GASS share similar angular resolution and match well in sensitivity. Combined, they are ideally suited to be a successor to LAB.Results. The new HI4PI survey outperforms the LAB in angular resolution (theta(FWHM) = 16'.2) and sensitivity (sigma(rms) = 43 mK). Moreover, it has full spatial sampling and thus overcomes a major drawback of LAB, which severely undersamples the sky. We publish all-sky column density maps of the neutral atomic hydrogen in the Milky Way, along with full spectroscopic data, in several map projections including HEALPix.