Angular momentum distribution of hot gas and implications for disk galaxy formation

	Angular momentum distribution of hot gas and implications for disk galaxy formation
	Chen, DN ; Jing, YP ; Yoshikaw, K
刊名	ASTROPHYSICAL JOURNAL
	2003-11-01
卷号	597 期号:1 页码:35-47
关键词	cosmology : theory dark matter galaxies : formation galaxies : halos galaxies : spiral galaxies : structure
英文摘要	We study the angular momentum profiles both for dark matter and for gas within virialized halos using a statistical sample of halos drawn from cosmological hydrodynamics simulations. Three simulations have been analyzed: one is the nonradiative simulation and the other two have radiative cooling. We find that the gas component, on average, has a larger spin and contains a smaller fraction of mass with negative angular momentum than its dark matter counterpart in the nonradiative model. As to the cooling models, the gas component shares approximately the same spin parameter as its dark matter counterpart, but the hot gas has a higher spin and is more aligned in angular momentum than dark matter, while the opposite holds for the cold gas. After the mass of negative angular momentum is excluded, the angular momentum pro. le of the hot gas component approximately follows the universal function originally proposed by Bullock et al. for dark matter, though the shape parameter mu is much larger for hot gas and is comfortably in the range required by observations of disk galaxies. Since disk formation is related to the distribution of hot gas that will cool, our study may explain the fact that the disk component of observed galaxies contains a smaller fraction of low angular momentum material than dark matter in halos.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	X-RAY-CLUSTERS ; STATISTICAL PROPERTIES ; HYDRODYNAMIC SIMULATIONS ; GALACTIC HALOS ; TIDAL TORQUES ; DARK HALOS ; DENSITY ; ORIGIN ; PROTOGALAXIES ; HISTORIES
收录类别	SCI
语种	英语
WOS记录号	WOS:000186170800004
公开日期	2010-11-08
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/11809]
专题	上海天文台_星系宇宙学重点实验室
作者单位	1.MPI Astrophys, Partner Grp, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Tokyo, Sch Sci, Res Ctr Early Universe, Tokyo 1130033, Japan
推荐引用方式 GB/T 7714	Chen, DN,Jing, YP,Yoshikaw, K. Angular momentum distribution of hot gas and implications for disk galaxy formation[J]. ASTROPHYSICAL JOURNAL,2003,597(1):35-47.
APA	Chen, DN,Jing, YP,&Yoshikaw, K.(2003).Angular momentum distribution of hot gas and implications for disk galaxy formation.ASTROPHYSICAL JOURNAL,597(1),35-47.
MLA	Chen, DN,et al."Angular momentum distribution of hot gas and implications for disk galaxy formation".ASTROPHYSICAL JOURNAL 597.1(2003):35-47.