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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