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	An equilibrium dark matter halo with the burkert profile
	Liu, WH; Fu, YN; Deng, ZG; Huang, JH
刊名	Publications of the astronomical society of japan
	2005
卷号	57期号:4页码:541-547
关键词	Cosmology : dark matter Galaxies : kinematics and dynamics Methods : numerical
ISSN号	0004-6264
通讯作者	Liu, wh(dracoliu@hotmail.com)
英文摘要	In this paper a prescription for generating an equilibrium spherical system depicted with cuspy density profiles is extended to a core density profile, the burkert profile, which is observationally more suitable to dwarfs. by using a time-saving monte carlo method instead of n-body simulations, we show that the burkert halo, which is initialized with a distribution function that depends only on energy, is in a practically stable equilibrium. the one generated with the local maxwellian approximation is unstable, where the flat core density structure tends to steepen. this is fundamentally different from a previous study on a halo with a cuspy density profile. the deviation of the unstable "burkert" from the initial burkert profile is found to be closely related to taking a gaussian as the velocity distribution at any given point. the significance of not using the local maxwellian approximation is further demonstrated by exploring the dynamical evolution of compact super star clusters (sscs) in the burkert halo. in particular, the local maxwellian approximation results in underestimating the dynamical friction and overestimating sinking time scale. accordingly, this leads to a lower probability of forming massive bulges and young nuclear star clusters in bulgeless galaxies.
WOS关键词	LATE-TYPE GALAXIES ; DENSITY PROFILES ; STAR-CLUSTERS ; CORE
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
语种	英语
出版者	ASTRONOMICAL SOC JAPAN
WOS记录号	WOS:000231834600002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2377187
专题	中国科学院大学
通讯作者	Liu, WH
作者单位	1.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China 2.Chinese Acad Sci, Purple Mtn Obser, Nanjing 210008, Peoples R China 3.Chinese Acad Sci, Natl Observ, Beijing 100039, Peoples R China 4.Chinese Acad Sci, Grad Sch, Dept Phys, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Liu, WH,Fu, YN,Deng, ZG,et al. An equilibrium dark matter halo with the burkert profile[J]. Publications of the astronomical society of japan,2005,57(4):541-547.
APA	Liu, WH,Fu, YN,Deng, ZG,&Huang, JH.(2005).An equilibrium dark matter halo with the burkert profile.Publications of the astronomical society of japan,57(4),541-547.
MLA	Liu, WH,et al."An equilibrium dark matter halo with the burkert profile".Publications of the astronomical society of japan 57.4(2005):541-547.

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