The H2O Southern Galactic Plane Survey: NH3 (1,1) and (2,2) catalogues
The H2O Southern Galactic Plane Survey: NH3 (1,1) and (2,2) catalogues
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DOI：
10.1111/j.1365-2966.2012.21800.x
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发表时间：
2012-07
影响因子：
4.8
通讯作者：
C. Purcell;S. Longmore;A. Walsh;M. Whiting;S. Breen;T. Britton;K. Brooks;M. Burton;M. Cunningham;J. Green;L. Harvey-Smith;L. Hindson;M. Hoare;B. Indermuehle;P. Jones;N. Lo;V. Lowe;C. Phillips;M. Thompson;J. Urquhart;M. Voronkov;G. White
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文献类型：
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作者：
C. Purcell;S. Longmore;A. Walsh;M. Whiting;S. Breen;T. Britton;K. Brooks;M. Burton;M. Cunningham;J. Green;L. Harvey-Smith;L. Hindson;M. Hoare;B. Indermuehle;P. Jones;N. Lo;V. Lowe;C. Phillips;M. Thompson;J. Urquhart;M. Voronkov;G. White
H₂O南银面巡天（HOPS）已经绘制了一个100度的银面带（-70°> 1 > 30°，|b| 10⁴cm⁻³）。在本文中，我们给出了NH₃（1,1）和（2,2）数据，它们的分辨率为2 arcmin，覆盖了±200 km s⁻¹的速度范围。NH₃数据集的中位数灵敏度为σT(mb) =0.20±0.06 K。对于（1,1）跃迁，该灵敏度相当于在5σ水平上探测20k， 400 M⊙云的3.2 kpc距离限制。类似的质量为5000 M⊙的云将在银河系中心被探测到，而30000 M⊙的云将在整个银河系被看到。我们在澳大利亚国家望远镜设施（ATNF） duchamp软件的基础上开发了一个自动发射发现程序，并使用它创建了669个密集分子云的新目录。该目录在5秒检测限（T(mb) = 1.0 K）下100%完成。对系综云性质的初步分析表明，近运动距离是有利的。云的位置与当前的银河系模型一致，其中包含一个长条形。结合其他星系平面调查，这一新的分子线数据集构成了研究星系结构和演化的关键工具。社区可以通过HOPS网站获得数据立方体、光谱和目录。
The H₂O Southern Galactic Plane Survey (HOPS) has mapped a 100 degrees strip of the Galactic plane (-70° > l > 30°, |b| 10⁴cm⁻³). In this paper, we present the NH₃ (1,1) and (2,2) data, which have a resolution of 2 arcmin and cover a velocity range of ± 200 km s⁻¹. The median sensitivity of the NH₃ data cubes is σT(mb) =0.20 ± 0.06 K. For the (1,1) transition, this sensitivity equates to a 3.2 kpc distance limit for detecting a 20 K, 400 M⊙ cloud at the 5σ level. Similar clouds of mass 5000 M⊙ would be detected as far as the Galactic Centre, while 30000 M⊙ clouds would be seen across the Galaxy. We have developed an automatic emission finding procedure based on the Australian Telescope National Facility (ATNF) duchamp software and have used it to create a new catalogue of 669 dense molecular clouds. The catalogue is 100 per cent complete at the 5s detection limit (T(mb) = 1.0 K). A preliminary analysis of the ensemble cloud properties suggests that the near-kinematic distances are favoured. The cloud positions are consistent with current models of the Galaxy containing a long bar. Combined with other Galactic plane surveys this new molecular-line data set constitutes a key tool for examining Galactic structure and evolution. Data cubes, spectra and catalogues are available to the community via the HOPS website.