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arXiv 2203.14972astro-ph.GA
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超大质量再电离晕中的混沌星系形成

Chaotic and Clumpy Galaxy Formation in an Extremely Massive Reionization-Era Halo

Justin S. Spilker, Christopher C. Hayward, Daniel P. Marrone, Manuel Aravena, Matthieu Bethermin, James Burgoyne, Scott C. Chapman, Thomas R. Greve, Gayathri Gu… 展开作者

Justin S. Spilker, Christopher C. Hayward, Daniel P. Marrone, Manuel Aravena, Matthieu Bethermin, James Burgoyne, Scott C. Chapman, Thomas R. Greve, Gayathri Gururajan, Yashar D. Hezaveh, Ryley Hill, Katrina C. Litke, Christopher C. Lovell, Matthew A. Malkan, Eric J. Murphy, Desika Narayanan, Kedar A. Phadke, Cassie Reuter, Antony A. Stark, Nikolaus Sulzenauer, Joaquin D. Vieira, David Vizgan, Axel Weiss

摘要:

z=6.900的SPT 0311 -58系统是再电离时期内的一个极其巨大的结构,并提供了一个了解原始密度场极端峰值中星系形成的机会。我们提出了70 mas阿塔卡马大型毫米/亚毫米阵列观测的尘埃连续体和CII 158 μ m发射的中央对星系,并达到物理分辨率~100- 350 pc,其中最详细的意见,任何再电离时代的系统日期。观测结果将源解析为至少12个千秒差距大小的团块。星系内的整体运动学和高湍流速度色散与最近声称的在z~4处仅8亿年后的一些尘埃星系中动态冷薄盘运动学形成了鲜明的对比。我们推测,引力相互作用和来自大质量母盘的碎片可能在系统的整体动力学和团块形成中发挥了作用。每个星系团的质量与其他在静止紫外/光学深场巡天中发现的6<z<8星系相当,但恒星形成率提高了3- 5倍。在内部,团块本身与在低红移星系中发现的维里化云尺度结构的放大版本非常相似。我们的观察是定性相似的大规模晕内看到的模拟高红移星系的混乱和clupholic大会。

英文摘要:

The SPT0311-58 system at z=6.900 is an extremely massive structure within the reionization epoch, and offers a chance to understand the formation of galaxies in an extreme peak in the primordial density field. We present 70mas Atacama Large Millimeter/submillimeter Array observations of the dust continuum and CII 158um emission in the central pair of galaxies and reach physical resolution ~100-350pc, among the most detailed views of any reionization-era system to date. The observations resolve the source into at least a dozen kiloparsec-size clumps. The global kinematics and high turbulent velocity dispersion within the galaxies present a striking contrast to recent claims of dynamically cold thin-disk kinematics in some dusty galaxies just 800Myr later at z~4. We speculate that both gravitational interactions and fragmentation from massive parent disks have likely played a role in the overall dynamics and formation of clumps in the system. Each clump individually is comparable in mass to other 6<z<8 galaxies identified in rest-UV/optical deep field surveys, but with star formation rates elevated by ~3-5x. Internally, the clumps themselves bear close resemblance to greatly scaled-up versions of virialized cloud-scale structures identified in low-redshift galaxies. Our observations are qualitatively similar to the chaotic and clumpy assembly within massive halos seen in simulations of high-redshift galaxies.

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