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Mass loss of galaxies due to an ultraviolet background
Okamoto, Takashi1; Gao, Liang1,2; Theuns, Tom1,3
2008-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume390Issue:3Pages:920-928
AbstractWe 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.
KeywordMethods: Numerical Galaxies: Evolution Galaxies: Formation Cosmology: Theory
DOI10.1111/j.1365-2966.2008.13830.x
Indexed BySCI
Language英语
WOS IDWOS:000260106400004
Citation statistics
Cited Times:319[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7332
Collection星系宇宙学研究部
Affiliation1.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
Recommended Citation
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.
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