Inferred galaxy properties during Cosmic Dawn from early JWST photometry results

被引：3

作者：

Brummel-Smith, Corey ^{[1
]}

Skinner, Danielle ^{[1
]}

Sethuram, Snigdaa S. ^{[1
]}

Wise, John H. ^{[1
]}

Xia, Bin ^{[1
]}

Taori, Khushi ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Phys, Ctr Relativist Astrophys, Atlanta, GA 30332 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 525卷 / 03期

基金：

美国国家科学基金会;

关键词：

galaxies: formation; galaxies: high-redshift; galaxies: photometry; (galaxies:) quasars: supermassive black holes; EPOCH SIMULATIONS FLARES; POPULATION III STARS; STELLAR POPULATIONS; RADIATIVE-TRANSFER; 1ST GALAXIES; REIONIZATION; EVOLUTION; CANDIDATES; HISTORIES; EMISSION;

D O I：

10.1093/mnras/stad2569

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Early photometric results from JWST have 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 recent JWST observations, 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 10(7)M(circle dot), to infer the intrinsic properties of the JWST galaxies. 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 of z > 10 galaxies will confirm the presence and nature of high-energy sources in the early Universe and will constrain their exact redshifts.

引用

页码：4405 / 4425

页数：21

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