A two-parameter family of double-power-law biorthonormal potential-density expansions

A two-parameter family of double-power-law biorthonormal potential-density expansions
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双幂律双正交势密度展开的双参数族

DOI:
10.1093/mnras/sty1038
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发表时间:
2018
影响因子:
4.8
通讯作者:
Lilley E
Lilley E
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lilley E

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我们给出了一族双参数双正交双幂律势密度展开式。势和密度都以封闭的解析形式给出,并且可以通过递推关系快速计算。我们证明了这个族包含了所有已知的解析双正交展开式:赵展开式(本身就是Hernquist&Ostriker和Clutton-Brock早先发现的展开式的推广)和最近发现的Lilley等人的展开式。扩张。我们的新的双参数系列包括基于许多熟悉的球面密度分布的零阶模型的展开,包括γ模型和Jaffe模型。它还包含一个基扩展,以零级重现著名的Navarro-Frenk-White(NFW)轮廓。新的基展式是通过一种系统的方法发现的,这种方法在寻找其他新的展开式方面有广泛的应用。在这个过程中,我们还发现了泊松方程的一个新的积分变换解。
We present a two-parameter family of biorthonormal double-power-law potential-density expansions. Both the potential and density are given in a closed analytic form and may be rapidly computed via recurrence relations. We show that this family encompasses all the known analytic biorthonormal expansions: the Zhao expansions (themselves generalizations of ones found earlier by Hernquist & Ostriker and by Clutton-Brock) and the recently discovered Lilley et al. expansion. Our new two-parameter family includes expansions based around many familiar spherical density profiles as zeroth-order models, including the γ models and the Jaffe model. It also contains a basis expansion that reproduces the famous Navarro–Frenk–White (NFW) profile at zeroth order. The new basis expansions have been found via a systematic methodology which has wide applications in finding other new expansions. In the process, we also uncovered a novel integral transform solution to Poisson’s equation.
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DOI: 10.1093/mnras/sty296
发表时间: 2018
影响因子: 4.8
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