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Mass loss of galaxies due to an ultraviolet background
文献类型：期刊论文
| 作者 | Okamoto, Takashi1; Gao, Liang1,2 ; Theuns, Tom1,3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2008-11-01 |
| 卷号 | 390期号:3页码:920-928 |
| 关键词 | methods: numerical galaxies: evolution galaxies: formation cosmology: theory |
| 英文摘要 | We perform cosmological hydrodynamic simulations to determine to what extent galaxies lose their gas due to photoheating from an ionizing background. We find that the characteristic mass at which haloes on average have lost half of their baryons is M(c) similar to 6.5 x 10(9) h(-1) M(circle dot) at z = 0, which corresponds to a circular velocity of 25 km s(-1). This is significantly lower than the filtering mass obtained by the linear theory, which is often used in semi-analytical models of galaxy formation. We demonstrate it is the gas temperature at the virial radius which determines whether a halo can accrete gas. A simple model that follows the merger history of the dark matter progenitors, and where gas accretion is not allowed when this temperature is higher than the virial temperature of the halo, reproduces the results from the simulation remarkably well. This model can be applied to any reionization history, and is easy to incorporate in semi-analytical models. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000260106400004 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7332]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Univ Durham, Dept Phys, Inst Computat Cosmol, Durham DH1 3LE, England 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Antwerp, Dept Phys, B-2020 Antwerp, Belgium |
| 推荐引用方式 GB/T 7714 | Okamoto, Takashi,Gao, Liang,Theuns, Tom. Mass loss of galaxies due to an ultraviolet background[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2008,390(3):920-928. |
| APA | Okamoto, Takashi,Gao, Liang,&Theuns, Tom.(2008).Mass loss of galaxies due to an ultraviolet background.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,390(3),920-928. |
| MLA | Okamoto, Takashi,et al."Mass loss of galaxies due to an ultraviolet background".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 390.3(2008):920-928. |
入库方式： OAI收割
来源：国家天文台
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