论文标题
带有JWST和本地类似物的高Z星系 - 不仅是星形形成
High-z galaxies with JWST and local analogues -- it is not only star formation
论文作者
论文摘要
我对SMACS 0723的JWST NIRSPEC数据进行了分析，作为早期发布观测值。作为这三个新的红移的一部分，将可靠的红移总计达到14。我提出了对直接丰度确定方法的修改，以降低对通量校准不确定性的敏感性，并表明所产生的丰度与REST FERSIAL模型的REST FRAME FRAME FRAME FRAME-FRAME FRAME FRAME FLAME FLAME FLAME FLAME FLAME FEMPRAME SPECTIRAME MYSTIAME良好同意。我还表明，6355最有可能是一个狭窄的活性银河核（AGN），$ m_* \ sim 10^9 $ msun在z = 7.66处，并认为10612也可能通过与光电离子化模型和低频模拟和低速度模拟对其进行比较，对其磁通量有AGN的贡献。在假设线上来自恒星形成的假设下，我发现星系的气体耗竭时间约为$ 10^7 $年，与本地类似星系相当。我还确定了Z <3处可能是冲击主导的星系的人群，其近IR排放线可能几乎全部来自冲击，并讨论了它们的含义。我讨论了使用检测到的[O III] 4363定义的样品来确定质量金属关系的潜力，并使用低Z星系显示，这可以导致高达0.5 DEX的偏见，并具有质量为系统的趋势。
I present an analysis of the JWST NIRSpec data of SMACS 0723 released as Early Release Observations. As part of this three new redshifts are provided, bringing the total of reliable redshifts to 14. I propose a modification to the direct abundance determination method that reduces sensitivity to flux calibration uncertainties by a factor of ~3 and show that the resulting abundances are in good agreement with Bayesian photoionization models of the rest-frame optical spectrum. I also show that 6355 is most likely a narrow-line active galactic nucleus (AGN) with $M_* \sim 10^9$ Msun at z=7.66, and argue that 10612 might also have an AGN contribution to its flux through comparison to photoionization models and low-redshift analogues. Under the assumption that the lines come from star-formation I find that the galaxies have gas depletion times of ~$10^7$ years, comparable to similar galaxies locally. I also identify a population of possibly shock-dominated galaxies at z<3 whose near-IR emission lines plausibly come nearly all from shocks and discuss their implications. I close with a discussion of the potential for biases in the determination of the mass-metallicity relation using samples defined by detected [O III]4363 and show using low-z galaxies that this can lead to biases of up to 0.5 dex with a systematic trend with mass.
