Physics of star-formation history and the luminosity function of galaxies therefrom
Physics of star-formation history and the luminosity function of galaxies therefrom
复制标题
恒星形成历史的物理学及其星系的光度函数
DOI：
10.1093/mnras/stac774
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发表时间：
2022
影响因子：
4.8
通讯作者：
Kawasaki Masahiro
中科院分区：
文献类型：
--
作者：
Fukugita Masataka;Kawasaki Masahiro
在考虑星系的物理条件、Jeans判据和冷却过程的情况下，我们证明了在ΛCDM体系内，星系的恒星形成历史、再电离历史和现今光度函数在一个简单的引力坍缩模型中几乎可以定量地再现.在合理的模型参数下，再电离在红移1 +z <$7.5处急剧发生，由此产生的光度函数在处关闭，显示了恒星形成历史和宇宙再电离之间的一致性。该模型给出的恒星总数Ω星星= 0.004的临界密度的单位，与观测值0.0044与回收系数为1.6。为了解释观测到的恒星形成率和目前的光度函数，恒星形成效率不是与晕质量无关的，而是在晕质量处有一个最大值，并且对于较低质量和较高质量的晕都被抑制。
We show that the star-formation history, the reionization history and the present luminosity function of galaxies are reproduced in a simple gravitational collapse model within the ΛCDM regime to an almost quantitative accuracy when the physical conditions, the Jeans criterion and the cooling process are taken into account. Taking a reasonable set of model parameters, the reionization takes place sharply at about redshift 1 +z≃ 7.5, and the resulting luminosity function turns off at, showing the consistency between the star-formation history and the reionization of the Universe. The model gives the total amount of stars Ωstar= 0.004 in units of the critical density, compared with the observational value of 0.0044 with a recycling factor of 1.6. In order to account for the observed star-formation rate and the present luminosity function, the star-formation efficiency is not halo-mass-independent but has a maximum at the halo massand is suppressed for both lower- and higher-mass haloes.