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首页> 外文期刊>The Astrophysical journal >THE EFFECTS OF EARLY COSMIC REIONIZATION ON THE SUBSTRUCTURE PROBLEM IN GALACTIC HALOS
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THE EFFECTS OF EARLY COSMIC REIONIZATION ON THE SUBSTRUCTURE PROBLEM IN GALACTIC HALOS

机译：早期宇宙电离对银晕中子结构问题的影响

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摘要

Recent observations of the cosmic microwave background by the Wilkinson Microwave Anisotropy Probe strongly suggest that the reionization of the universe took place quite early (z ～ 17). On the other hand, it has been pointed out that the cold dark matter cosmology suffers from a substructure problem in which more subgalactic halos are produced in the Local Group than dwarf galaxies. In this Letter, as a potential mechanism for solving this problem, we consider the feedback effects of early reionization on the formation of small-scale structures. For this purpose, we perform three-dimensional radiation hydrodynamic simulations, incorporating the radiative transfer for ionizing photons. As a result, it is found that the early reionization is devastating for low-mass systems with M_(vir) approx < 10~8 solar mass or υ_(circ) approx < 20 km s~(-1), and almost all gas is photoevaporated in more than 95% of low-mass systems. Such a strong negative feedback on the formation of low-mass galaxies may solve the substructure problem and support the picture that Local Group dwarf galaxies are descendants of the more massive halos that experienced and survived tidal stripping.
机译：威尔金森微波各向异性探测器最近对宇宙微波背景的观测结果强烈表明，宇宙的电离作用发生得很早（z〜17）。另一方面，已经指出，冷暗物质宇宙学遭受一个亚结构问题的困扰，在该亚结构问题中，本地群中产生的银河系下晕比矮星系更多。在这封信中，作为解决此问题的潜在机制，我们考虑了早期电离对小规模结构形成的反馈作用。为此，我们进行了三维辐射流体动力学仿真，并结合了用于电离光子的辐射传递。结果发现，对于M_（vir）约<10〜8太阳质量或υ_（circ）约<20 km s〜（-1）的低质量系统，几乎所有气体，早期电离都具有毁灭性在超过95％的低质量系统中被光蒸发。对低质量星系形成如此强烈的负面反馈可能会解决子结构问题，并支持以下观点：局部群矮星系是经历了潮汐剥离并幸存下来的更大质量晕的后代。

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