Baryonic solutions and challenges for cosmological models of dwarf galaxies
Baryonic solutions and challenges for cosmological models of dwarf galaxies
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DOI：
10.1038/s41550-022-01689-w
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发表时间：
2022-06
期刊：
影响因子：
14.1
通讯作者：
L. Sales;A. Wetzel;Azadeh Fattahi
中科院分区：
文献类型：
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作者：
L. Sales;A. Wetzel;Azadeh Fattahi
星系及其暗物质晕对暗能量+冷暗物质（ΛCDM）宇宙学模型提出了挑战。这些观测和理论之间的差异在最低质量的星系中加剧。ΛCDM对低质量暗物质晕的数量、空间分布和内部结构的预测在历史上一直与观测到的矮星系不一致，但这是部分预期的，因为许多预测只模拟了暗物质成分。任何强有力的ΛCDM预测都必须包括一个星系形成模型，以了解重子物质如何填充和影响暗物质晕。在这篇综述中，我们考虑了ΛCDM关于矮星系的最显着的挑战，我们讨论了最近的宇宙学数值模拟如何精确定位这些挑战的重子解决方案。我们确定剩余的紧张局势，包括内部暗物质含量的多样性，卫星，恒星形态和恒星形成淬火的飞机。这些问题的解决，或作为ΛCDM的实际问题的验证，可能需要改进星系形成模型和提高模拟的数值精度。
Galaxies and their dark-matter haloes have posed several challenges to the dark energy plus cold dark matter (ΛCDM) cosmological model. These discrepancies between observations and theory intensify for the lowest-mass (‘dwarf’) galaxies.ΛCDM predictions for the number, spatial distribution and internal structure of low-mass dark-matter haloes have historically been at odds with observed dwarf galaxies, but this is partially expected, because many predictions modelled only the dark-matter component. Any robustΛCDM prediction must include, hand in hand, a model for galaxy formation to understand how baryonic matter populates and affects dark-matter haloes. In this Review, we consider the most notable challenges toΛCDM regarding dwarf galaxies, and we discuss how recent cosmological numerical simulations have pinpointed baryonic solutions to these challenges. We identify remaining tensions, including the diversity of the inner dark-matter content, planes of satellites, stellar morphologies and star-formation quenching. Their resolution, or validation as actual problems withΛCDM, will probably require both refining of galaxy-formation models and improving numerical accuracy in simulations.