arXiv 2512.047442025-12-04astro-ph.GA

ALMA-QUARKS：几千年蛋的孵化：超音速突破超致密H II区域从其父体热核区

ALMA-QUARKS: Few-Thousand-Year Hatching out of "Egg": The Supersonic Breakout of a Hypercompact H II Region from Its Parental Hot Core

Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS（中国科学院南美天文中心，国家天文台）；Kavli Institute for Astronomy and Astrophysics, Peking University（北京大学天体物理研究所）；Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）；Department of Astronomy, The University of Texas at Austin（德克萨斯大学奥斯汀分校天文系）；Aix Marseille Univ, CNRS, CNES, LAM（艾克斯-马赛大学，法国国家科学研究中心，法国国家空间研究中心，拉格朗日天体物理实验室）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；School of Physics and Astronomy, Yunnan University（云南大学物理与天文学院）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences（中国科学院射电天文与技术重点实验室）；Indian Institute of Space Science and Technology（印度空间科学与技术学院）；Korea Astronomy and Space Science Institute（韩国天文与空间科学研究院）；University of Science and Technology, Korea (UST)（韩国科学技术院）；School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）

Siju Zhang, Guido Garay, Fengwei Xu, Luis F. Rodríguez, Neal J. Evans, Annie Zavagno, Paul F. Goldsmith, Dongting Yang, Xunchuan Liu, Aiyuan Yang, Tie Liu, Amel… 展开作者

Siju Zhang, Guido Garay, Fengwei Xu, Luis F. Rodríguez, Neal J. Evans, Annie Zavagno, Paul F. Goldsmith, Dongting Yang, Xunchuan Liu, Aiyuan Yang, Tie Liu, Amelia M. Stutz, Hong-Li Liu, Wenyu Jiao, Anandmayee Tej, Lei Zhu, Kee-Tae Kim, Pablo García, Thomas Peters, Thomas Möller, Shanghuo Li, Leonardo Bronfman

备注：: 18 pages, 14 figures, accepted for publication by ApJ

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AI总结：

ALMA-QUARKS观测揭示超致密H II区域从父体热核中超音速突破的过渡过程，通过动态香槟流解释其各向异性电离流的形成。

摘要：

超致密H II（HC H II）区域围绕年轻高质量恒星的运动学演化仍由于与父体环境的复杂相互作用而理解不足。我们提供了ALMA QUARKS/ATOMS在1.3毫米和3毫米波长的观测（最高分辨率约0.01 pc），观测到一个深嵌的HC H II区域（直径约0.015 pc，电子密度约2×10^5 cm^-3），显示出相对于其父体热分子核的显著大于20 km/s的全球红移，这在光学薄的H30α/H40α重组线中观察到。1.3毫米连续数据揭示出一个明显的0.1 pc弧和垂直的0.04 pc尾。我们提出这种形态源于动态香槟流：HC H II区域缓慢扩张进入已存在的丝状体形成弧和相关的低速（几km/s）SiO冲击波。同时，在相反方向，电离气体沿尾迹所追踪的陡峭密度梯度逃逸，并伴有高速（20 km/s）的SiO发射。我们拒绝了离子化气体与 runaway 高质量恒星共同移动的bow shock情景，因为弧中的受激气体与hub速度一致，这与bow shock预测相矛盾。非局部热力学平衡辐射转移建模进一步排除了离子化气体下沉作为速度偏移起源的可能。我们得出结论，这个特殊的HC H II区域正在经历几千年“蛋的孵化”过渡阶段：HC H II区域的电离气体刚刚从其父体热核中突破，现在正在以超音速向外流动。这项工作突显了各向异性密度分布如何诱导超音速各向异性电离流，从而控制HC H II区域的演化。

英文摘要：

The kinematic evolution of hypercompact H II (HC H II) regions around young high-mass stars remains poorly understood due to complex interactions with parental environs. We present ALMA QUARKS/ATOMS 1.3 mm/3 mm observations (the highest resolution $\sim0.01$ pc) of a deeply embedded HC H II region (diameter $\sim0.015$ pc, electron density $\sim2\times10^{5}$ cm$^{-3}$) exhibiting a striking $\gtrsim20$ km s$^{-1}$ global redshift seen in optically thin H30$α$/H40$α$ recombination lines relative to its parental hot molecular core within a hub-filament system. The 1.3 mm continuum data reveal a distinct 0.1-pc arc and a perpendicular 0.04-pc tail. We propose that this morphology arises from a dynamic champagne flow: the slow expansion of HC H II region into a pre-existing filament forms the arc and associated low-velocity (few km s$^{-1}$) SiO shocks. Meanwhile, in the opposite direction ionized gas escapes along a steep density gradient traced by the tail and high-velocity (20 km s$^{-1}$) SiO emission. We reject the bow shock scenario in which ionized gas co-moves with a runaway high-mass star because shocked gas in the arc aligns with the hub velocity, contradicting the bow shock prediction. Non-LTE radiative transfer modeling further rules out infall of ionized gas as the velocity shift origin. We conclude that this exceptional HC H II region is undergoing a few-thousand-year transition phase of "hatching out of the egg": the ionized gas of HC H II region has just broken out of its parental hot core and now is flowing outward supersonically. This work highlights how anisotropic density distributions induce supersonically anisotropic ionized flows that govern HC H II region evolution.

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