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arXiv 2602.01238astro-ph.GAastro-ph.SR
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ATOMS-QUARKS调查:在超大质量原星团G318.049+00.086中的流入和坍缩:竞争吸积的证据

ATOMS-QUARKS survey: Inflow and infall in massive protocluster G318.049+00.086: Evidence of competitive accretion

Indian Institute of Astrophysics(印度天体物理研究所);Pondicherry University(本地治里大学);S.N. Bose National Centre for Basic Sciences(S.N. 玻色基础科学国家中心);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);Max Planck Institute for Astronomy(马克斯·普朗克天文学研究所);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究所);University of Science and Technology(科学技术大学);Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS(中国科学院国家天文台南美天文中心)
Shivani Gupta, Tapas Baug, Archana Soam, Tie Liu, Fengwei Xu, Satyajeet Moharana, Guido Garay, Chang Won Lee, Siju Zhang, Ariful Hoque, Puja Porel, Lei Zhu, Don… 展开作者

Shivani Gupta, Tapas Baug, Archana Soam, Tie Liu, Fengwei Xu, Satyajeet Moharana, Guido Garay, Chang Won Lee, Siju Zhang, Ariful Hoque, Puja Porel, Lei Zhu, Dongting Yang, HongLi Liu, Wenyu Jiao, Xunchuan Liu, Alik Panja, Xiaofeng Mai, Yankun Zhang, Shinyoung Kim

AI总结:

通过研究G318.049+00.086原星团,发现气体流入中心枢纽并支持竞争吸积模型,表明物质从引力较弱的核心向引力有利位置的核心汇聚。

摘要:

我们对超大质量原星团G318.049+00.086进行了气体动力学研究。该原星团报告包含12个预星核候选者和4个原恒星核。利用1.3毫米尘埃连续体图识别出丝状结构,其中四条丝状结构汇聚成一个密集的中心区域,形成hub-丝状系统(HFS)。从H13CO+发射线沿三条丝状结构的PV分析中得出的高速梯度(10-20 km s$^{-1}$ pc$^{-1}$)表明,气体正在向中心枢纽流入。沿丝状结构的气体流入速率超过10^3 M_sun Myr$^{-1}$,表明中心枢纽能够形成大质量恒星。对H13CO+和CCH光谱轮廓的调查揭示出大多数核心具有典型的蓝色不对称线轮廓,这是引力坍缩的典型特征。其余几个核心显示出红色不对称轮廓,表明气体正在膨胀。此外,推导出的原恒星核在hub区域的气体流入速率显著高于沿丝状结构的那些核心。核心的质量-半径关系表明,具有红色轮廓的核心处于大质量恒星形成阶段。然而,沿丝状结构的全局速度梯度表明,这些核心正在向枢纽失去物质。我们的结果支持了大质量恒星形成中的竞争吸积情景,即气体预计会从引力主导较少的核心向引力更有利的位置的核心汇聚。

英文摘要:

We present a gas kinematic study of the massive protocluster G318.049+00.086. The protocluster is reported to contain 12 prestellar core candidates and 4 protostellar cores. Filamentary structures are identified using the 1.3 mm dust continuum map, with four of them converge into a dense central region, forming a hub-filament system (HFS). High velocity gradients (10 - 20 km s$^{-1}$ pc$^{-1}$) derived from PV analysis of H$^{13}$CO$^{+}$ emission along three of those filaments are suggestive of mass inflow onto the central hub. A mass inflow rate higher than $10^{3}$ M$_{\odot}$ Myr$^{-1}$ along the filaments is indicating that the central hub is capable of forming massive star(s). Investigation of H$^{13}$CO$^{+}$ and CCH spectral profiles revealed the majority of the cores having the characteristic blue asymmetric line profiles, typical signature of gravitational collapse. The remaining few cores showed red asymmetric profiles, indicative of gas expansion. Also, the derived mass infall rates for the protostellar cores in hub-region is significantly higher in comparison to those located along the filaments. The mass-radius relationship of the cores revealed that the cores with red profiles reside in the massive star formation regime. However, the global velocity gradient along the filaments suggests that these particular cores are losing material to the hub. Our results are supporting a competitive accretion scenario of massive star formation where gas is expected to be funnelled from less gravitationally dominant cores to the cores located at the gravitationally favorable position.

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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