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arXiv 2212.02491astro-ph.GA
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红移$z\approx8$到近邻宇宙的恒星质量-金属丰度关系的演化

Evolution of the Mass-Metallicity Relation from Redshift $z\approx8$ to the Local Universe

Danial Langeroodi, Jens Hjorth, Wenlei Chen, Patrick L. Kelly, Hayley Williams, Yu-Heng Lin, Claudia Scarlata, Adi Zitrin, Tom Broadhurst, Jose M. Diego, Xiaosh… 展开作者

Danial Langeroodi, Jens Hjorth, Wenlei Chen, Patrick L. Kelly, Hayley Williams, Yu-Heng Lin, Claudia Scarlata, Adi Zitrin, Tom Broadhurst, Jose M. Diego, Xiaosheng Huang, Alexei V. Filippenko, Ryan J. Foley, Saurabh Jha, Anton M. Koekemoer, Masamune Oguri, Ismael Perez-Fournon, Justin Pierel, Frederick Poidevin, Lou Strolger

AI总结:

本研究利用JWST观测被RXJ2129.4$+$0005透镜化的高红移星系,首次定量统计推断$z\approx8$处的质量-金属丰度关系,测得其归一化较近邻宇宙演化约0.9 dex,结果与FIRE模拟预测相符,且高红移星系性质与近邻蓝莓星系相似但金属丰度更低。

摘要:

在低红移处已观测到星系的恒星质量与气相金属丰度之间存在紧密的正相关关系。该相关性的红移演化能够对星系演化理论形成强约束。詹姆斯·韦布空间望远镜(JWST)的出现使得研究人员能够探测远超出此前可及红移范围的质量-金属丰度关系。本文中,我们报告了通过JWST的NIRCam成像与NIRSpec光谱观测,在被星系团RXJ2129.4$+$0005引力透镜化的目标中,发现了两个红移分别为8.15和8.16的发射线星系。我们测量了这两个星系以及另外9个红移范围为$7.2 < z_{\rm spec} < 9.5$的星系的金属丰度与恒星质量,首次给出了$z\approx8$处质量-金属丰度关系的定量统计推断结果。我们测得从$z \approx 8$到近邻宇宙,质量-金属丰度关系的归一化值演化了约0.9 dex;在恒星质量固定的情况下,$z \approx 8$处星系的金属富集程度仅为当今星系的1/8。我们推断出的归一化值与FIRE(反馈作用于真实环境)模拟的预测结果相符。推断得到的质量-金属丰度关系斜率与FIRE模拟的预测值、或是低红移处的观测值相近,或略平缓。我们将$z \approx 8$的星系与近邻宇宙中的极低金属丰度类似体候选天体进行了对比,发现它们通常与极端发射线星系或“绿豌豆”星系存在明显差异,但在强发射线比值与金属丰度方面与“蓝莓星系”相似。尽管存在这一相似性,在恒星质量固定的情况下,$z \approx 8$的星系的金属丰度系统性地低于蓝莓星系。

英文摘要:

A tight positive correlation between the stellar mass and the gas-phase metallicity of galaxies has been observed at low redshifts. The redshift evolution of this correlation can strongly constrain theories of galaxy evolution. The advent of JWST allows probing the mass-metallicity relation at redshifts far beyond what was previously accessible. Here we report the discovery of two emission-line galaxies at redshifts 8.15 and 8.16 in JWST NIRCam imaging and NIRSpec spectroscopy of targets gravitationally lensed by the cluster RXJ2129.4$+$0005. We measure their metallicities and stellar masses along with nine additional galaxies at $7.2 < z_{\rm spec} < 9.5$ to report the first quantitative statistical inference of the mass-metallicity relation at $z\approx8$. We measure $\sim 0.9$ dex evolution in the normalization of the mass-metallicity relation from $z \approx 8$ to the local Universe; at fixed stellar mass, galaxies are 8 times less metal enriched at $z \approx 8$ compared to the present day. Our inferred normalization is in agreement with the predictions of the FIRE simulations. Our inferred slope of the mass-metallicity relation is similar to or slightly shallower than that predicted by FIRE or observed at lower redshifts. We compare the $z \approx 8$ galaxies to extremely low metallicity analog candidates in the local Universe, finding that they are generally distinct from extreme emission-line galaxies or "green peas" but are similar in strong emission-line ratios and metallicities to "blueberry galaxies". Despite this similarity, at fixed stellar mass, the $z \approx 8$ galaxies have systematically lower metallicities compared to blueberry galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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