Westerbork氢在局域星系（HALOGAS）中的吸积巡天I.调查描述和试点观察
The Westerbork Hydrogen Accretion in Local Galaxies (HALOGAS) Survey I. Survey Description and Pilot Observations
摘要：
我们介绍一个新的，非常深的中性氢（HI）的调查正在进行的韦斯特博克综合射电望远镜（WSRT）。Westerbork Hydrogen Accretion in LOcal GAlaxieS（HALOGAS）Survey正在制作一些最敏感的HI观测档案，这些观测在角尺度上对于研究附近星系及其周围的微弱弥漫气体最有用。调查数据正在被用于对星系进行仔细的建模，描述其气体含量，形态和运动学，其主要目标是揭示本地宇宙中螺旋星系的冷气体吸积的全球特征。在本文中，我们描述了调查样本的选择，数据采集，减少和分析，并提出了我们的试点计划，其中包括UGC 2082，NGC 672，NGC 925，和NGC 4565的数据产品。观测结果揭示了完整的HALOGAS项目旨在阐明的画面的第一眼：在不同类型的螺旋中吸积HI的特性，以及在一系列银河系环境中。没有一个试点调查星系拥有NGC 891规模的HI晕，但都显示出不同的晕气体特征。我们比较了飞行员巡天星系中探测到的特征与它们的全球特征，并讨论了它们与NGC 891和NGC 2403的异同。
英文摘要：
We introduce a new, very deep neutral hydrogen (HI) survey being performed with the Westerbork Synthesis Radio Telescope (WSRT). The Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) Survey is producing an archive of some of the most sensitive HI observations available, on the angular scales which are most useful for studying faint, diffuse gas in and around nearby galaxies. The survey data are being used to perform careful modeling of the galaxies, characterizing their gas content, morphology, and kinematics, with the primary goal of revealing the global characteristics of cold gas accretion onto spiral galaxies in the local Universe. In this paper, we describe the survey sample selection, the data acquisition, reduction, and analysis, and present the data products obtained during our pilot program, which consists of UGC 2082, NGC 672, NGC 925, and NGC 4565. The observations reveal a first glimpse of the picture that the full HALOGAS project aims to illuminate: the properties of accreting HI in different types of spirals, and across a range of galactic environments. None of the pilot survey galaxies hosts an HI halo of the scale of NGC 891, but all show varying indications of halo gas features. We compare the properties of detected features in the pilot survey galaxies with their global characteristics, and discuss similarities and differences with NGC 891 and NGC 2403.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
