Inferred galaxy properties during Cosmic Dawn from early JWST photometry results
Inferred galaxy properties during Cosmic Dawn from early JWST photometry results
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根据早期 JWST 光度测量结果推断宇宙黎明期间的星系特性
DOI：
10.1093/mnras/stad2569
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发表时间：
2023
影响因子：
4.8
通讯作者：
Taori, Khushi
中科院分区：
文献类型：
--
作者：
Brummel-Smith, Corey;Skinner, Danielle;Sethuram, Snigdaa S.;Wise, John H.;Xia, Bin;Taori, Khushi
JWST的早期光度测量结果已经揭示了一些红移超过10的星系候选者。推断的恒星质量和相关的宇宙星星形成率的初步估计高于大多数理论模型的预测，在最极端的情况下高达20倍，而这已经缓和后，重新校准的近红外相机和随后的光谱检测。使用这些recentJWST观测，我们使用星系的尺度关系从宇宙学模拟模型的星星形成历史非常高的红移，回到一个起始晕质量为107兆焦耳，推断theJWST星系的内在属性。在这里，我们探讨了超大质量黑洞，恒星双星，以及过量的大质量恒星的高红移星系的整体光度的贡献。尽管光谱能量分布的替代组件，我们发现恒星质量等于或略高于以前的恒星质量估计。大多数星系的光谱都是由恒星组成的，恒星种群模型的确切选择似乎并没有造成很大的差异。我们发现，12个高红移星系候选者中有4个最适合与不可忽略的活动星系核组成部分，但仅从连续体的证据是不够的，以确认它们的存在。即将到来的z> 10星系的光谱观测将证实早期宇宙中高能源的存在和性质，并将限制它们的精确红移。
Early photometric results fromJWSThave revealed a number of galaxy candidates above redshift 10. The initial estimates of inferred stellar masses and the associated cosmic star formation rates are above most theoretical model predictions up to a factor of 20 in the most extreme cases, while this has been moderated after the recalibration of NIRCam and subsequent spectroscopic detections. Using these recentJWSTobservations, we use galaxy scaling relations from cosmological simulations to model the star formation history to very high redshifts, back to a starting halo mass of 107M⊙, to infer the intrinsic properties of theJWSTgalaxies. Here, we explore the contribution of supermassive black holes, stellar binaries, and an excess of massive stars to the overall luminosity of high-redshift galaxies. Despite the addition of alternative components to the spectral energy distribution, we find stellar masses equal to or slightly higher than previous stellar mass estimates. Most galaxy spectra are dominated by the stellar component, and the exact choice for the stellar population model does not appear to make a major difference. We find that four of the 12 high-redshift galaxy candidates are best fit with a non-negligible active galactic nuclei component, but the evidence from the continuum alone is insufficient to confirm their existence. Upcoming spectroscopic observations ofz> 10 galaxies will confirm the presence and nature of high-energy sources in the early Universe and will constrain their exact redshifts.
影响因子：
2
作者：
Ghan, Justin;Steger, Ryan;Kazerooni, H.
通讯作者：
Kazerooni, H.