JWST's PEARLS: TN J1338-1942 - I. Extreme jet-triggered star formation in a z = 4.11 luminous radio galaxy
JWST's PEARLS: TN J1338-1942 - I. Extreme jet-triggered star formation in a z = 4.11 luminous radio galaxy
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JWST 的珍珠：TN J1338-1942 - I. z = 4.11 发光射电星系中极端喷流触发的恒星形成
DOI：
10.1093/mnras/stad1267
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发表时间：
2023
影响因子：
4.8
通讯作者：
Duncan K
中科院分区：
文献类型：
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作者：
Duncan K
我们提出了第一次JWST观测的z = 4.11发光射电星系TN J1338-1942，作为“再电离和透镜科学的主要河外地区”（“珍珠”）项目的一部分。我们的NIRCam观测，旨在探测在这个红移的关键静止框架光学连续谱和发射线功能，使解决光谱能量分布建模，结合了一系列的恒星人口假设和辐射冲击模型。TN J1338-1942的恒星质量估计为log 10（M/M）<$10.9，被确认为这个时期已知质量最大的星系之一。我们的观测还揭示了与活动星系核喷流一致的极高的等宽星云辐射，这与广泛的近期星星形成所包围的辐射冲击最吻合。我们估计总恒星形成率（SFR）可能高达，保守地将SFR归因于喷流诱导的爆发。恒星形成的质量加权年龄，tmass<400万年，与引发活动的喷流的可能年龄一致，并且明显比在宿主星系核心测量的年龄年轻。潜在的喷流引发的恒星形成活动的极端规模表明，在大质量星系形成的最早阶段，活动星系核正反馈的潜在重要性，我们的观测也说明了用JWST详细研究高红移星系的非凡前景。
We present the first JWST observations of thez= 4.11 luminous radio galaxy TN J1338–1942, obtained as part of the ‘Prime Extragalactic Areas for Reionization and Lensing Science’ (‘PEARLS’) project. Our NIRCam observations, designed to probe the key rest-frame optical continuum and emission line features at this redshift, enable resolved spectral energy distribution modelling that incorporates both a range of stellar population assumptions and radiative shock models. With an estimated stellar mass of log10(M/M⊙) ∼ 10.9, TN J1338–1942 is confirmed to be one of the most massive galaxies known at this epoch. Our observations also reveal extremely high equivalent-width nebular emission coincident with the luminous AGN jets that is best fit by radiative shocks surrounded by extensive recent star formation. We estimate the total star-formation rate (SFR) could be as high as, with the SFR that we attribute to the jet induced burst conservatively. The mass-weighted age of the star-formation,tmass< 4 Myr, is consistent with the likely age of the jets responsible for the triggered activity and significantly younger than that measured in the core of the host galaxy. The extreme scale of the potential jet-triggered star-formation activity indicates the potential importance of positive AGN feedback in the earliest stages of massive galaxy formation, with our observations also illustrating the extraordinary prospects for detailed studies of high-redshift galaxies with JWST.