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Mass loss of galaxies due to an ultraviolet background
Okamoto, Takashi1; Gao, Liang1,2; Theuns, Tom1,3
2008-11-01
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号390期号:3页码:920-928
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.
关键词Methods: Numerical Galaxies: Evolution Galaxies: Formation Cosmology: Theory
DOI10.1111/j.1365-2966.2008.13830.x
收录类别SCI
语种英语
WOS记录号WOS:000260106400004
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被引频次:292[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7332
专题星系宇宙学研究部
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
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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.
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