The dense cores and filamentary structure of the molecular cloud in Corona Australis: Herschel SPIRE and PACS observations from the Herschel Gould Belt Survey

The dense cores and filamentary structure of the molecular cloud in Corona Australis: Herschel SPIRE and PACS observations from the Herschel Gould Belt Survey
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澳大利亚日冕分子云的致密核心和丝状结构:来自赫歇尔古尔德带巡天的 Herschel SPIRE 和 PACS 观测

DOI:
10.1051/0004-6361/201730515
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发表时间:
2018
影响因子:
6.5
通讯作者:
Bresnahan D
Bresnahan D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bresnahan D

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我们利用赫歇尔空间天文台的光度数据,展示了南冕分子云内的前恒星和无星核心的目录。距离 d~ 130 pc 处,南冕是最近的恒星形成区域之一。赫歇尔使用光谱和光度成像接收器 (SPIRE) 以及光电探测器阵列相机和光谱仪 (PACS) 光度相机以平行模式拍摄了南冕的多波长数据,波长范围为 70–500μm。鉴定出了无星和前恒星核心以及嵌入式原恒星的完整样本。赫歇尔古尔德带巡天的其他结果显示了致密核心的分布与分子云内的丝状结构之间的空间相关性。我们进一步展示了这些核心的特性与其在云中的空间分布之间的相关性,特别关注密集核心相对于其丝状接近度的质量分布。我们发现,只有质量较低的无星核心远离丝状结构,而所有质量较高的前恒星核心都是在丝状结构附近或直接在丝状结构上形成的。这一结果支持了恒星核心主要在细丝上形成的范例。我们分析了整个分子云的质量分布,发现证据表明与分子云内的其他团块相比,皇冠周围的区域似乎处于更动态的高级进化阶段。
We present a catalogue of prestellar and starless cores within the Corona Australis molecular cloud using photometric data from theHerschelSpace Observatory. At a distance ofd~ 130 pc, Corona Australis is one of the closest star-forming regions.Herschelhas taken multi-wavelength data of Corona Australis with both the Spectral and Photometric Imaging Receiver (SPIRE) and the Photodetector Array Camera and Spectrometer (PACS) photometric cameras in a parallel mode with wavelengths in the range 70–500μm. A complete sample of starless and prestellar cores and embedded protostars is identified. Other results from theHerschelGould Belt Survey have shown spatial correlation between the distribution of dense cores and the filamentary structure within the molecular clouds. We go further and show correlations between the properties of these cores and their spatial distribution within the clouds, with a particular focus on the mass distribution of the dense cores with respect to their filamentary proximity. We find that only lower-mass starless cores form away from filaments, while all of the higher-mass prestellar cores form in close proximity to or directly on the filamentary structure. This result supports the paradigm that prestellar cores mostly form on filaments. We analyse the mass distribution across the molecular cloud, finding evidence that the region around the Coronet appears to be at a more dynamically advanced evolutionary stage in comparison to the rest of the clumps within the cloud.
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