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arXiv 2301.09775astro-ph.GA
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中心-暗条系统G326中的螺旋结构和大质量恒星的形成

Spiral Structure and Massive Star formation in the Hub-Filament-System G326.27-0.49

Bhaswati Mookerjea, V. S. Veena, Rolf Guesten, F. Wyrowski, Akhil Lasrado

摘要:

中心暗条系统是星团和大质量恒星形成的潜在场所。为了理解HFSs,并提供观测约束,目前的理论,试图解释全球恒星形成,我们报告了一项研究的区域与G326.27-0.49使用红外数据的尘埃连续体和新获得的观测分子示踪剂使用APEX望远镜。我们使用光谱观测来识别速度相干结构(细丝和团块),并在0.4 pc的分辨率下研究它们的性质。该区域包含两个主要的速度分量:第一个分量在-63到-55 km/s之间,显示出四个丝状体,形成一个汇聚在轮毂中的螺旋结构;第二个分量在-72 km/s,包含一个大质量的年轻恒星,可能与轮毂相互作用。该区域三个主要的YSO所在的团块质量很大(187-535 Msun),光度与B型星一致,中心密度约为10^6 cm^-3,并驱动着大量的外流。该区域的大多数速度相干团块的维里参数在2-7之间,考虑到原恒星的探测,这意味着坍缩是渐进的。我们的结论是,该区域由一个暗条网络组成,通过暗条网络,质量(~10^-4 Msun/yr)被吸积到中心上。中心和一些细丝的末端似乎正在经历坍缩形成新的恒星。这项研究确定了未来高分辨率观测的目标区域,可以探测核心和暗条演化之间的联系。

英文摘要:

Hub-filament systems (HFSs) are potential sites of formation of star clusters and high mass stars. To understand the HFSs and to provide observational constraints on current theories that attempt to explainstar formation globally, we report a study of the region associated with G326.27-0.49 using infrared data of dust continuum and newly obtained observations on molecular tracers using the APEX telescope. We use the spectroscopic observations to identify velocity-coherent structures (filaments and clumps) and study their properties at a resolution of 0.4 pc. The region contains two main velocity components: first component shows four filaments between -63 and -55 km/s forming a spiral structure converging in a hub, the second filamentary component at -72 km/s harbors a massive young stellar object and possibly interacts with the hub. The clumps harbouring the three main YSOs in the region are massive (187-535 Msun), have luminosities consistent with B-type stars, have central densities of ~10^6 cm^-3 and drive large outflows. Majority of the velocity-coherent clumps in the region show virial parameters between 2-7, which considering the detection of protostars implies collapse to be gradual. We conclude that the region consists of a network of filaments through which mass accretes (~10^-4 Msun/yr) onto the hub. The hub and some of the ends of filaments appear to be undergoing collapse to form new stars. This study identifies a target region for future high resolution observations that could probe the link between the core and filament evolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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