Fitting functions for dark matter density profiles
Fitting functions for dark matter density profiles
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DOI：
10.1093/mnras/sts175
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发表时间：
2012-09
影响因子：
4.8
通讯作者：
J. An;J. An;HongSheng Zhao;HongSheng Zhao;HongSheng Zhao
中科院分区：
文献类型：
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作者：
J. An;J. An;HongSheng Zhao;HongSheng Zhao;HongSheng Zhao
我们提出了一个统一的参数化的拟合函数适用于密度分布的暗物质晕或椭圆星系。一个值得注意的特点是，经典的Einasto轮廓自然地出现在Zhao（1996）的双幂律轮廓中，作为核心子族的连续极限情况。在此基础上，我们还认为，有基本上没有定性的差异晕模型很好地拟合Einasto轮廓和标准NFW模型。这甚至可能是定量的情况，除非模拟的分辨率和拟合的精度足够高，使有意义的区分成为可能。
We present a unified parameterization of the fitting functions suitable for density profiles of dark matter haloes or elliptical galaxies. A notable feature is that the classical Einasto profile appears naturally as the continuous limiting case of the cored subfamily amongst the double power-law profiles of Zhao (1996). Based on this, we also argue that there is basically no qualitative difference between halo models well-fitted by the Einasto profile and the standard NFW model. This may even be the case quantitatively unless the resolutions of simulations and the precisions of fittings are sufficiently high to make meaningful distinction possible.