Physical properties of DLAs: Metallicity and neutral hydrogen column density

	Physical properties of DLAs: Metallicity and neutral hydrogen column density
	Hou, JL; Shu, CG; Chen, WP; Chang, RX; Fu, CQ; Duc, PA; Braine, J; Brinks, E
刊名	RECYCLING INTERGALACTIC AND INTERSTELLAR MATTER
	2004
期号	217 页码:246-251
英文摘要	We investigate some basic properties of Damped Lyman alpha systems based on the Semi-Analytical model of disk galaxy formation theory. We derive the DLA metallicity, column density, number density, gas content and cosmic star formation rate by assuming that disks form at the center of dark halos, and the modelled DLAs are selected by Monte Carlo simulation according to the distributions of halo properties. We find that DLA hosts are dominated by small galaxies and biased to extended galaxies. In terms of model results, DLAs could naturally arise in a ACDM universe from radiatively cooled gas in dark matter halos. However, model predicts a reverse correlation between metallicity and the column density when compared with observations, regardless of the proposed observational bias. We argue that this could be resulted from the model limitations, or the inadequacy of Schmidt-type star formation mode at high redshift, or/and the diversities of DLA populations.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LY-ALPHA SYSTEMS ; CHEMICAL EVOLUTION ; STAR-FORMATION ; SPIRAL GALAXIES ; DISC GALAXIES ; GAS ; ABSORPTION
收录类别	SCI ; ISTP
语种	英语
WOS记录号	WOS:000222682600063
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18308]
专题	上海天文台_星系宇宙学重点实验室
作者单位	CAS, Shanghai Astron Observ, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Hou, JL,Shu, CG,Chen, WP,et al. Physical properties of DLAs: Metallicity and neutral hydrogen column density[J]. RECYCLING INTERGALACTIC AND INTERSTELLAR MATTER,2004(217):246-251.
APA	Hou, JL.,Shu, CG.,Chen, WP.,Chang, RX.,Fu, CQ.,...&Brinks, E.(2004).Physical properties of DLAs: Metallicity and neutral hydrogen column density.RECYCLING INTERGALACTIC AND INTERSTELLAR MATTER(217),246-251.
MLA	Hou, JL,et al."Physical properties of DLAs: Metallicity and neutral hydrogen column density".RECYCLING INTERGALACTIC AND INTERSTELLAR MATTER .217(2004):246-251.