Stress testing ΛCDM with high-redshift galaxy candidates.

Stress testing ΛCDM with high-redshift galaxy candidates.
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DOI:
10.1038/s41550-023-01937-7
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发表时间:
2023
期刊:
影响因子:
14.1
通讯作者:
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中科院分区:
物理与天体物理1区
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来自詹姆斯·韦伯太空望远镜(JWST)的早期数据揭示了一群高红移星系候选者,它们的恒星质量出乎意料地高。一个迫在眉睫的问题是,在标准的ΛCDM宇宙学模型中,这些候选星系与星系形成的一致性,其中星系的恒星质量(M -)受到其宿主暗物质晕的可用重子储存库的限制。因此,暗物质晕的质量函数对任何时代z上质量大于M -百科的星系的数量密度n (>M -百科,z)和恒星质量密度ρ -百科(>M -百科,z)施加了绝对上限。在这里,我展示了在z≈7-10处JWST观测中质量最大的候选星系位于这些极限的边缘,这表明了观测得出的星系性质的一个重要未解决的问题。星系是如何在ΛCDM或这个标准宇宙学中形成的。早期詹姆斯韦伯太空望远镜(JWST)的结果表明,在宇宙的前5亿年里,恒星形成的水平很高。一项对暗物质晕的可用质量的研究表明,意想不到的高质量JWST星系候选者可能会挑战主流的宇宙学模型。
Early data from the James Webb Space Telescope (JWST) have revealed a bevy of high-redshift galaxy candidates with unexpectedly high stellar masses. An immediate concern is the consistency of these candidates with galaxy formation in the standard ΛCDM cosmological model, wherein the stellar mass (M⋆) of a galaxy is limited by the available baryonic reservoir of its host dark matter halo. The mass function of dark matter haloes therefore imposes an absolute upper limit on the number density n (>M⋆, z) and stellar mass density ρ⋆ (>M⋆, z) of galaxies more massive than M⋆ at any epoch z. Here I show that the most massive galaxy candidates in JWST observations at z ≈ 7–10 lie at the very edge of these limits, indicating an important unresolved issue with the properties of galaxies derived from the observations, how galaxies form at early times in ΛCDM or within this standard cosmology itself. Early James Webb Space Telescope (JWST) results suggest a high level of star formation in the first 500 million years of the Universe. A study of the available mass from dark matter haloes shows that unexpectedly high-mass JWST galaxy candidates may challenge the prevailing cosmological model.
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影响因子: 64.8
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发表时间: 2023-03-07
影响因子: 4.8
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发表时间: 2003-12-01
影响因子: 4.8
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发表时间: 2016-06-10
影响因子: 4.9
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