Molecular Line Observations in Two Dusty Star-forming Galaxies at z = 6.9-猫眼课题宝

DOI：

10.3847/1538-4357/ac21db

发表时间：

2021-08

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

S. Jarugula;J. Vieira;A. Weiss;J. Spilker;M. Aravena;M. Archipley;M. Béthermin;S. C Chapman;Chenxing Dong;T. Greve;K. Harrington;C. Hayward;Y. Hezaveh;R. Hill;K. Litke;M. Malkan;D. Marrone;D. Narayanan;K. Phadke;C. Reuter;K. Rotermund

SPT0311-58是迄今为止在再电离时代（EoR）发现的最大的红外发光系统。在本文中，我们利用阿塔卡马大型毫米/亚毫米阵列，通过对CO（6-5）、CO（7-6）、CO（10-9）、[C i]（2 - 1）和p - H2O（21,1−20,2）谱线和尘埃连续辐射的高分辨率观测，详细分析了z = 6.9的分子星际介质。该系统由一对强烈的恒星形成，引力透镜星系（标记为西部和东部）组成。其远红外本征光度西为（16±4）× 1012 L⊙，东为（27±4）× 1011 L⊙。我们使用非局域热力学平衡辐射传递模型对尘埃、CO和[C i]进行了建模，并估计西部的固有气体质量为（5.4±3.4）× 1011 M⊙，东部的固有气体质量为（3.1±2.7）× 1010 M⊙。我们发现东、西部的CO谱线能量分布是典型的高红移亚毫米星系（smg）。模型估计的CO-to- h2转换因子（α CO）和气体枯竭时间尺度在不确定度范围内与文献中的高红移smg一致。我们没有发现SMGs在z bbbb3的耗尽时间随红移的演化证据。这是迄今为止对EoR星系中分子气体含量最详细的研究，也是迄今为止在没有任何证据表明存在活动星系核的情况下，在星系中最远探测到H2O的研究。

SPT0311-58 is the most massive infrared luminous system discovered so far during the Epoch of Reionization (EoR). In this paper, we present a detailed analysis of the molecular interstellar medium at z = 6.9, through high resolution observations of the CO(6–5), CO(7–6), CO(10–9), [C i](2–1), and p‐H2O(21,1 −20,2) lines and dust continuum emissions with the Atacama Large Millimeter/submillimeter Array. The system consists of a pair of intensely star-forming, gravitationally lensed galaxies (labeled West and East). The intrinsic far-infrared luminosity is (16 ± 4) × 1012 L ⊙ in West and (27 ± 4) × 1011 L ⊙ in East. We model the dust, CO, and [C i] using non-local thermodynamic equilibrium radiative transfer models and estimate the intrinsic gas mass to be (5.4 ± 3.4) × 1011 M ⊙ in West and (3.1 ± 2.7) × 1010 M ⊙ in East. We find that the CO spectral line energy distribution in West and East are typical of high-redshift submillimeter galaxies (SMGs). The CO-to-H2 conversion factor (α CO) and the gas depletion timescales estimated from the model are consistent with the high-redshift SMGs in the literature within the uncertainties. We find no evidence of evolution of depletion time with redshift in SMGs at z > 3. This is the most detailed study of molecular gas content of a galaxy in the EoR to date, with the most distant detection of H2O in a galaxy without any evidence for active galactic nuclei in the literature.

Molecular Line Observations in Two Dusty Star-forming Galaxies at z = 6.9

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