The ISM in the z = 6.9 Interacting Galaxies of SPT0311-58
The ISM in the z = 6.9 Interacting Galaxies of SPT0311-58
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DOI：
10.3847/1538-4357/acc93a
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发表时间：
2023-06
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通讯作者：
K. Litke;D. Marrone;M. Aravena;M. Archipley;M. Béthermin;James Burgoyne;Jared Cathey;S. Chapman;Anthony H. Gonzalez;T. Greve;G. Gururajan;C. Hayward;M. Malkan;K. Phadke;C. Reuter;K. Rotermund;J. Spilker;A. Stark;N. Sulzenauer;J. Vieira;D. Vizgan;A. Weiss
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作者：
K. Litke;D. Marrone;M. Aravena;M. Archipley;M. Béthermin;James Burgoyne;Jared Cathey;S. Chapman;Anthony H. Gonzalez;T. Greve;G. Gururajan;C. Hayward;M. Malkan;K. Phadke;C. Reuter;K. Rotermund;J. Spilker;A. Stark;N. Sulzenauer;J. Vieira;D. Vizgan;A. Weiss
SPT 0311 -58是再电离时代的两个相互作用的星系系统，存在于那个时代理论上可能存在的最稀有，最大质量的暗物质晕之一。研究这些星系中的星际介质（ISM）可以阐明早期宇宙中星系形成的过程。在这项工作中，我们探索在这个系统中的多相ISM，使用阿尔马观测的[C ii] 158，[O i] 146，[N ii] 122，和[O iii] 88精细结构线和尘埃连续体。我们发现，在东部和西部星系之间的线比，以及整个西部星系的变化很大。连续色表示SPT 0311 -58 E的电离参数（logU <$−2.8）高于SPT 0311 -58 W（logU <$−3.1）。[O iii] 88-[N ii] 122的比值和电离参数的限制联合收割机结合在一起，证明了这些天体在大爆炸后8亿年内的近太阳金属丰度。
SPT0311-58, a system of two interacting galaxies in the Epoch of Reionization, exists in one of the rarest, most massive dark matter halos theoretically possible in that era. Studying the interstellar medium (ISM) in these galaxies can illuminate the process of galaxy formation in the early Universe. In this work, we explore the multiphase ISM in this system, using ALMA observations of the [C ii] 158, [O i] 146, [N ii] 122, and [O iii] 88 fine-structure lines and dust continuum. We find wide variations in line ratios between the eastern and western galaxies, as well as across the western galaxy. Continuum colors indicate that SPT0311-58 E has a higher ionization parameter ( logU≈−2.8 ) than SPT0311-58 W ( logU≈−3.1 ). The ratio of [O iii] 88–[N ii] 122 and the ionization parameter constraints combine to demonstrate near-solar metallicity in these objects just 800 Myr after the Big Bang.