A First Look at the Abundance Pattern—O/H, C/O, and Ne/O—in z > 7 Galaxies with JWST/NIRSpec

A First Look at the Abundance Pattern—O/H, C/O, and Ne/O—in z > 7 Galaxies with JWST/NIRSpec
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使用 JWST/NIRSpec 初步了解 z > 7 星系中的丰度模式 - O/H、C/O 和 Ne/O

DOI:
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发表时间:
2022
影响因子:
7.9
通讯作者:
J. Kartaltepe
J. Kartaltepe
中科院分区:
物理与天体物理2区
文献类型:
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作者:
K. Arellano;D. Berg;J. Chisholm;P. Arrabal Haro;M. Dickinson;S. Finkelstein;F. Leclercq;N. Rogers;R. Simons;E. Skillman;J. Trump;J. Kartaltepe

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我们分析了詹姆斯韦伯太空望远镜(JWST)上的近红外光谱仪(NIRSpec)早期释放观测的三个z > 7星系的静止框架近紫外和光学星云光谱。这三个高z星系显示了几个强发射星云线的检测,包括温度敏感的[O iii] λ4363线,使我们能够直接确定星云的条件和O/H,C/O和Ne/O的丰度。我们得到的O/H丰度和电离参数,一般与其他最近的分析是一致的。我们分析了质量-金属丰度关系(即,斜率)及其红移演化。我们还在一个z > 8的星系中探测到了C iii] λλ1907,1909发射,我们从该星系中确定了迄今为止最遥远的C/O丰度。log(C/O)= −0.83 ± 0.38这个有价值的发现,提供了C/O红移演化到高红移的第一个测试。对于氖,我们使用高电离[Ne iii] λ3869线测量z > 7时的第一个Ne/O丰度,发现α元素比没有变化。我们探索在z > 8星系中试探性地探测到[Fe ii]和[Fe iii]线,这将表明金属的快速积累。重要的是,我们证明了适当的通量校准和更高的S/N光谱是至关重要的,鲁棒地确定在z > 7星系与NIRSpec/JWST的丰度模式。
We analyze the rest-frame near-UV and optical nebular spectra of three z > 7 galaxies from the Early Release Observations taken with the Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST). These three high-z galaxies show the detection of several strong emission nebular lines, including the temperature-sensitive [O iii] λ4363 line, allowing us to directly determine the nebular conditions and abundances for O/H, C/O, and Ne/O. We derive O/H abundances and ionization parameters that are generally consistent with other recent analyses. We analyze the mass–metallicity relationship (i.e., slope) and its redshift evolution by comparing between the three z > 7 galaxies and local star-forming galaxies. We also detect the C iii] λλ1907, 1909 emission in a z > 8 galaxy from which we determine the most distant C/O abundance to date. This valuable detection of log(C/O) = −0.83 ± 0.38 provides the first test of C/O redshift evolution out to high redshift. For neon, we use the high-ionization [Ne iii] λ3869 line to measure the first Ne/O abundances at z > 7, finding no evolution in this α-element ratio. We explore the tentative detection of [Fe ii] and [Fe iii] lines in a z > 8 galaxy, which would indicate a rapid buildup of metals. Importantly, we demonstrate that properly flux-calibrated and higher-S/N spectra are crucial to robustly determine the abundance pattern in z > 7 galaxies with NIRSpec/JWST.
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