GA-NIFS: ISM Properties and Metal Enrichment in a Merger-Driven Starburst During the Epoch of Reionisation Probed with JWST and ALMA

arxiv（2024）

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Abstract

We present deep JWST/NIRSpec integral-field spectroscopy (IFS) and ALMA [CII]λ158μm observations of COS-3018, a star-forming galaxy at z∼6.85, as part of the GA-NIFS programme. Both G395H (R∼ 2700) and PRISM (R∼ 100) NIRSpec observations revealed that COS-3018 is comprised of three separate components detected in [OIII]λ5008, which we dub as Main, North and East, with stellar masses of 10^9.4 ± 0.1, 10^9.2 ± 0.07, 10^7.7 ± 0.15 M_⊙. We detect [OIII]λ5008, [OIII]λλ3727,29 and multiple Balmer lines in all three components together with [OIII]λ4363 in the Main and North components. This allows us to measure an ISM temperature of T_e= 1.27±0.07× 10^4 and T_e= 1.6±0.14× 10^4 K with densities of n_e = 1250±250 and n_e = 700±200 cm^-3, respectively. These deep observations allow us to measure an average metallicity of 12+log(O/H)=7.9–8.2 for the three components with the T_e-method. We do not find any significant evidence of metallicity gradients between the components. Furthermore, we also detect [NII]λ6585, one of the highest redshift detections of this emission line. We find that in a small, metal-poor clump 0.2 arcsec west of the North component, N/O is elevated compared to other regions, indicating that nitrogen enrichment originates from smaller substructures, possibly proto-globular clusters. [OIII]λ5008 kinematics show that this system is merging, which is probably driving the ongoing, luminous starburst.

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【要点】：SND@LHC实验在LHC的首两年对源自IP1的νμs中性微子相互作用进行了观测，并通过安装第三Veto平面提高了探测器对μ子背景的排斥能力，计划升级以增强物理案例的统计性和系统性减少。

【方法】：实验使用了一套升级的探测器系统，其中包括新安装的第三Veto平面，以及通过测试束测量得到的能量分辨率，旨在提高对νe相互作用的识别能力。

【实验】：在2022和2023年收集的数据中，观测到源自LHC IP1的νμs中性微子相互作用，同时测量了进入探测器接受度的μ子通量，并研究了包含三个外出μ子的事件，这些事件可能是μ子三重态产物。使用的数据集名称未在摘要中明确提及，但实验观测和分析是基于在LHC期间的运行数据。

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