The super-NFW model: an analytic dynamical model for cold dark matter haloes and elliptical galaxies
The super-NFW model: an analytic dynamical model for cold dark matter haloes and elliptical galaxies
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超级 NFW 模型：冷暗物质晕和椭圆星系的解析动力学模型
DOI：
10.1093/mnras/sty295
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发表时间：
2018
影响因子：
4.8
通讯作者：
Lilley E
中科院分区：
文献类型：
--
作者：
Lilley E
提出了一个ρ ~ r−1at小半径和ρ ~ r−3.5at大半径的解析星系模型。密度渐近下降比Hernquist模型慢，但比暗物质晕的navarro - frank - white （NFW）模型快，因此与最近宇宙学模拟的证据一致。该模型在生物正交基函数展开中提供了零阶项，这意味着轴对称、三轴和不平衡扭曲可以很容易地添加（很像Hernquist模型本身，它是Hernquist- ostriker展开的零阶项）。详细讨论了球面模型的性质，包括解析分布函数的各向同性、径向各向异性和切向各向异性。给出了宇宙晕的质量浓度关系的类比。
An analytic galaxy model with ρ ∼r−1at small radii and ρ ∼r−3.5at large radii is presented. The asymptotic density fall-off is slower than the Hernquist model, but faster than the Navarro-Frenk-White (NFW) profile for dark matter haloes, and so in accord with recent evidence from cosmological simulations. The model provides the zeroth-order term in a biorthornomal basis function expansion, meaning that axisymmetric, triaxial, and lopsided distortions can easily be added (much like the Hernquist model itself which is the zeroth-order term of the Hernquist-Ostriker expansion). The properties of the spherical model, including analytic distribution functions which are either isotropic, radially anisotropic, or tangentially anisotropic, are discussed in some detail. The analogue of the mass–concentration relation for cosmological haloes is provided.