GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud

GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud
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GASKAP-HI 试点调查科学 III:小麦哲伦星云中冷气体的公正观点

DOI:
10.1017/pasa.2022.18
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发表时间:
2022
影响因子:
6.3
通讯作者:
Lee, Min-Young
Lee, Min-Young
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Dempsey, James;McClure-Griffiths, N. M.;Murray, Claire;Dickey, John M.;Pingel, Nickolas M.;Jameson, Katherine;Dénes, Helga;van Loon, Jacco Th.;Leahy, D.;Lee, Min-Young

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本文首次对小麦哲伦云中性氢吸收进行了无偏观测。该调查利用澳大利亚平方公里阵列探路者(ASKAP)望远镜进行的试验性HI观测,作为银河ASKAP HI(GASKAP-HI)项目的一部分,该项目的数据集已通过GASKAP-HI吸收管道进行处理,也在这里进行了描述。该数据集提供了对229个连续源的吸收光谱,比以前在SMC地区公布的连续源的数量增加了275%,并且比以前的SMC调查吸收光谱的质量有所提高。我们的无偏见的观点,结合发射和吸收之间密切匹配的光束大小,揭示了比2019年ATCA对SMC的调查更低的冷气部分(11%),并且更能代表SMC作为一个整体。我们还发现,SMC的酒吧和机翼区域之间的光学深度变化很大。在条形图中,我们发现光学深度通常较低(对光学薄柱密度假设的校正因子),但随柱密度线性增加。然而,在机翼中,尽管列密度的范围更小,但光学深度的散射范围很广。
We present the first unbiased survey of neutral hydrogen (HI) absorption in the Small Magellanic Cloud (SMC). The survey utilises pilot HI observations with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope as part of the Galactic ASKAP HI (GASKAP-HI) project whose dataset has been processed with the GASKAP-HI absorption pipeline, also described here. This dataset provides absorption spectra towards 229 continuum sources, a 275% increase in the number of continuum sources previously published in the SMC region, as well as an improvement in the quality of absorption spectra over previous surveys of the SMC. Our unbiased view, combined with the closely matched beam size between emission and absorption, reveals a lower cold gas faction (11%) than the 2019 ATCA survey of the SMC and is more representative of the SMC as a whole. We also find that the optical depth varies greatly between the SMC's bar and wing regions. In the bar we find that the optical depth is generally low (correction factor to the optically thin column density assumption of) but increases linearly with column density. In the wing however, there is a wide scatter in optical depth despite a tighter range of column densities.
一种通过星系盘导出 H I 吸收光谱的改进方法:在雕塑家组中的应用
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发表时间: 1992
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小麦哲伦星云中的冷原子气体
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