Fragmentation of the High-mass “Starless” Core G10.21-0.31: A Coherent Evolutionary Picture for Star Formation
Fragmentation of the High-mass “Starless” Core G10.21-0.31: A Coherent Evolutionary Picture for Star Formation
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DOI：
10.3847/1538-4357/acb211
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Wenyu Jiao;Ke Wang;T. Pillai;T. Baug;Siju Zhang;F. Xu
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作者：
Wenyu Jiao;Ke Wang;T. Pillai;T. Baug;Siju Zhang;F. Xu
G10.21-0.31是斯皮策、赫歇尔和APEX连续谱测量中发现的一个70μm的暗高质量无恒星核(M>；300M⊙，在R<；0.15PC内)，被认为是高质量恒星形成的初始阶段。我们介绍了阿塔卡马大毫米/亚毫米阵列(ALMA)和亚毫米阵列观测，以解析这个有希望的高质量无恒星核的内部结构。灵敏的高分辨率ALMA1.3 mm尘埃连续发射显示了三个质量核心，范围在11-18M⊙，特征是湍流碎裂。岩心1、2和3代表了三个不同阶段的一致演化，以外流(CO和SiO)、气体温度(H_2CO)和氢化(N2D+/N_2H+)为特征。我们确认了G10.21大质量恒星形成的潜力，并探索了大质量恒星形成的演化路径。然而，在G10.21中并不存在高质量的恒星前核心。这表明恒星的形成是一种动态的过程，其核心质量会随着时间的推移而增长。
G10.21-0.31 is a 70 μm dark high-mass starless core (M > 300 M ⊙ within r < 0.15 pc) identified in the Spitzer, Herschel, and APEX continuum surveys, and is believed to harbor the initial stages of high-mass star formation. We present Atacama Large Millimeter/submillimeter Array (ALMA) and Submillimeter Array observations to resolve the internal structure of this promising high-mass starless core. Sensitive high-resolution ALMA 1.3 mm dust continuum emission reveals three cores of mass ranging within 11–18 M ⊙, characterized by a turbulent fragmentation. Cores 1, 2, and 3 represent a coherent evolution of three different stages, characterized by outflows (CO and SiO), gas temperature (H2CO), and deuteration (N2D+/N2H+). We confirm the potential for formation of high-mass stars in G10.21 and explore the evolution path of high-mass star formation. Yet, no high-mass prestellar core is present in G10.21. This suggests a dynamical star formation where cores grow in mass over time.