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arXiv 2202.12470astro-ph.GA
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z = 5.7超亮星暴SPT0346-52中的多相ISM

Multi-Phase ISM in the z = 5.7 Hyperluminous Starburst SPT0346-52

Katrina C. Litke, Daniel P. Marrone, Manuel Aravena, Matthieu Bethermin, Scott C. Chapman, Chenxing Dong, Christopher C. Hayward, Ryley Hill, Sreevani Jarugula,… 展开作者

Katrina C. Litke, Daniel P. Marrone, Manuel Aravena, Matthieu Bethermin, Scott C. Chapman, Chenxing Dong, Christopher C. Hayward, Ryley Hill, Sreevani Jarugula, Matthew A. Malkan, Desika Narayanan, Cassie A. Reuter, Justin S. Spilker, Nikolaus Sulzenauer, Joaquin D. Vieira, Axel Weiss

摘要:

SPT 0346 -52(z=5.7)是南极望远镜发现的恒星形成最强烈的星系,Sigma_SFR约为4200 Msol yr^-1 kpc^-2。在本文中,我们扩展了以前的空间分辨研究,使用ALMA观测的尘埃连续体,[NII]205微米,[CII]158微米,[OI]146微米,和未检测到的[NII]122微米和[OI]63微米的排放,研究多相星际介质(ISM)在SPT 0346 -52。我们使用像素化的,基于分辨率的透镜建模来重建源平面发射。我们还使用光电离程序CLOUDY模拟了源面发射,并发现了一个超太阳金属丰度系统。我们计算T_dust = 48.3 K和lambda_peak = 80微米,并在所有五条线中看到线缺陷。电离气体的密度低于可比星系,n_e < 32 cm^-3,而[CII]158的发射约有20%来自ISM的电离相。我们还计算了ISM的几个阶段的质量。我们发现,在SPT 0346 -52中,分子气体占ISM的质量的主导地位,分子气体质量比中性原子气体质量高约4倍,比电离气体质量高约100倍。

英文摘要:

SPT0346-52 (z=5.7) is the most intensely star-forming galaxy discovered by the South Pole Telescope, with Sigma_SFR ~ 4200 Msol yr^-1 kpc^-2. In this paper, we expand on previous spatially-resolved studies, using ALMA observations of dust continuum, [NII]205 micron, [CII]158 micron, [OI]146 micron, and undetected [NII]122 micron and [OI]63 micron emission to study the multi-phase interstellar medium (ISM) in SPT0346-52. We use pixelated, visibility-based lens modeling to reconstruct the source-plane emission. We also model the source-plane emission using the photoionization code CLOUDY and find a supersolar metallicity system. We calculate T_dust = 48.3 K and lambda_peak = 80 micron, and see line deficits in all five lines. The ionized gas is less dense than comparable galaxies, with n_e < 32 cm^-3, while ~20% of the [CII]158 emission originates from the ionized phase of the ISM. We also calculate the masses of several phases of the ISM. We find that molecular gas dominates the mass of the ISM in SPT0346-52, with the molecular gas mass ~4x higher than the neutral atomic gas mass and ~100x higher than the ionized gas mass.

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