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题名: HI Gas in Disk and Dwarf Galaxies in the Semi-analytic Models of Galaxy Formation
作者: Fu, Jian; Wang, Jing; Luo, Yu
刊名: FROM INTERSTELLAR CLOUDS TO STAR-FORMING GALAXIES: UNIVERSAL PROCESSES?
出版日期: 2016
卷号: 315, 期号:8, 页码:UNSP 99065A
英文摘要: We construct the radially-resolved semi-analytic models of galaxy formation based on the L-Galaxies model framework, which include both atomic and molecular gas phase in ISM. The models run on the halo outputs of Lambda CDM cosmology N-body simulation. Our models can reproduce varies observations of HI gas in nearby galaxies, e.g. the HI mass function, the HI-to-star ratio vs stellar mass and stellar surface density, universal HI radial surface density profile in outer disks etc. We also give the physical origin of HI size-mass relation. Based on our model results for local dwarf galaxies, we show that the "missing satellite problem" also exists in the HI component, i.e., the models over-predict dwarf galaxies with low HI mass around the Milky Way. That is a shortcoming of current Lambda CDM cosmology framework. Future survey for HI gas in local dwarf galaxies (e.g. MeerKAT, SKA & FAST) can help to verify the nature of dark matter (cold or warm).
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17050
Appears in Collections:南极天文中心_期刊论文

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