The width of Herschel filaments varies with distance
The width of Herschel filaments varies with distance
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赫歇尔细丝的宽度随距离变化
DOI：
10.1051/0004-6361/202142281
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发表时间：
2022
影响因子：
6.5
通讯作者：
Smith, R. J.
中科院分区：
文献类型：
--
作者：
Panopoulou, G. V.;Clark, S. E.;Hacar, A.;Heitsch, F.;Kainulainen, J.;Ntormousi, E.;Seifried, D.;Smith, R. J.
背景：附近分子云中的丝状结构已经被发现表现出0.1pC的特征宽度，就像在尘埃排放中观察到的那样。了解这一普遍宽度的起源已经成为研究分子云结构和恒星形成早期阶段的一个重要主题。目的.我们利用之前发表的Herschel Gould带测量结果，研究恢复的细丝宽度如何依赖于到观测者的距离。方法：我们使用基于3D尘埃消光图和Gaia的最新结果，获得了Herschel观测到的到附近分子云的距离的最新估计。我们分别检查了单个云团的细丝宽度，而不是将它们视为一个单一的种群。我们使用这些每云的灯丝宽度来搜索先前发表的研究中云之间的变化迹象。结果，我们发现每云的平均灯丝宽度与距离有显著的相关性。近云的平均灯丝宽度分布与较远云的平均灯丝宽度分布不相容。每朵云的平均宽度随着距离的变化而变化，大约为光束大小的4−5倍。我们通过对金牛座分子云的Herschel图像中的细丝轮廓进行会聚研究来检验分辨率的影响。我们发现分辨率会严重影响观测距离范围内的径向轮廓形状。结论我们得出的结论是，该数据与细丝的普遍特征宽度0.1pC不一致。
Context.Filamentary structures in nearby molecular clouds have been found to exhibit a characteristic width of 0.1 pc, as observed in dust emission. Understanding the origin of this universal width has become a topic of central importance in the study of molecular cloud structure and the early stages of star formation.Aims.We investigate how the recovered widths of filaments depend on the distance from the observer by using previously published results from theHerschelGould Belt Survey.Methods.We obtained updated estimates on the distances to nearby molecular clouds observed withHerschelby using recent results based on 3D dust extinction mapping andGaia. We examined the widths of filaments from individual clouds separately, as opposed to treating them as a single population. We used these per-cloud filament widths to search for signs of variation amongst the clouds of the previously published study.Results.We find a significant dependence of the mean per-cloud filament width with distance. The distribution of mean filament widths for nearby clouds is incompatible with that of farther away clouds. The mean per-cloud widths scale with distance approximately as 4−5 times the beam size. We examine the effects of resolution by performing a convergence study of a filament profile in theHerschelimage of the Taurus Molecular Cloud. We find that resolution can severely affect the shapes of radial profiles over the observed range of distances.Conclusions.We conclude that the data are inconsistent with 0.1 pc being the universal characteristic width of filaments.
NGC 1068 中的恒星形成
DOI：
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发表时间：
1983
期刊：
影响因子：
--
作者：
D. Weedman
通讯作者：
D. Weedman
NGC 2068、NGC 2071 和 Northern L1630 中的恒星形成
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
A. Gibb
通讯作者：
A. Gibb