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arXiv 2103.12199astro-ph.GA
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南部HII地区发现调查。II。完整目录

The Southern HII Region Discovery Survey. II. The Full Catalog

Trey V. Wenger, J. R. Dawson, John M. Dickey, C. H. Jordan, N. M. McClure-Griffiths, L. D. Anderson, W. P. Armentrout, Dana S. Balser, T. M. Bania

摘要:

南半球HII区域发现巡天(英语:Southern HII Region Discovery Survey,缩写:SHRDS)是澳大利亚望远镜紧凑阵列(英语:Australia Telescope Compact Array)对南半球银河系HII区域和红外线识别的HII候选区域进行的900小时4-10 GHz射电连续谱和射电复合线巡天。对于本次数据发布,我们重新处理了所有先前发布的SHRDS数据,并包括额外的约450小时的观测。对新的HII区域的搜索现已完成,范围为259度&lt;银河经度&lt; 346度,|银河纬度|30 < 4 deg for HII region candidates with predicted 6 GHz continuum peak brightnesses >mJy/梁。我们检测到无线电连续发射对730个目标,包括以前已知的星云和HII区域的候选人。通过平均约18 RRL转换,我们检测到RRL发射到206以前已知的HII区域和436 HII区域候选者。在过去的十年中,包括北部天空调查在内,HII区域发现调查使已知的银河系HII区域数量增加了一倍以上。银河系HII区WISE星表中HII区的普查现在已经完成,其星云的9 GHz连续通量密度大于250 mJy。我们比较了新发现的SHRDS星云的RRL属性与所有以前已知的HII区域。整个WISE星表HII区域的RRL半峰全宽的中位数是23.9 km/s,并且在银河象限之间是一致的。在HII区域的人口中观察到的银河系速度不对称性可能反映了银河系中的螺旋结构。

英文摘要:

The Southern HII Region Discovery Survey (SHRDS) is a 900 hour Australia Telescope Compact Array 4-10 GHz radio continuum and radio recombination line (RRL) survey of Galactic HII regions and infrared-identified HII region candidates in the southern sky. For this data release, we reprocess all previously published SHRDS data and include an additional ~450 hours of observations. The search for new HII regions is now complete over the range 259 deg < Galactic longitude < 346 deg, |Galactic latitude| < 4 deg for HII region candidates with predicted 6 GHz continuum peak brightnesses >30 mJy/beam. We detect radio continuum emission toward 730 targets altogether including previously known nebulae and HII region candidates. By averaging ~18 RRL transitions, we detect RRL emission toward 206 previously known HII regions and 436 HII region candidates. Including the northern sky surveys, over the last decade the HII Region Discovery Surveys have more than doubled the number of known Galactic HII regions. The census of HII regions in the WISE Catalog of Galactic HII Regions is now complete for nebulae with 9 GHz continuum flux densities > 250 mJy. We compare the RRL properties of the newly discovered SHRDS nebulae with those of all previously known HII regions. The median RRL full-width at half-maximum line width of the entire WISE Catalog HII region population is 23.9 km/s and is consistent between Galactic quadrants. The observed Galactic longitude-velocity asymmetry in the population of HII regions probably reflects underlying spiral structure in the Milky Way.

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