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arXiv 0907.0018astro-ph.COhep-ph
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局域暗物质密度的一种新测定方法

A novel determination of the local dark matter density

Riccardo Catena, Piero Ullio

摘要:

我们提出了一个新的研究问题的银河系的质量模型,集中在功能方面的暗物质晕组件。我们已经考虑了一个多样化的样本的动态观测的银河系,包括最近出现的几个结果,并研究了一个7-或8维参数空间-定义的银河系模型-通过实施贝叶斯方法的参数估计的基础上的马尔可夫链蒙特卡罗方法。这种分析的主要结果是一种新的本地暗物质晕密度的测定,假设球对称性和Einasto或NFW密度分布被发现约为0.39 GeV厘米$^{-3}$与1- $σ$误差约为7%,更准确地说,我们发现一个$ρ_{DM}(R_0) = 0.385 \pm 0.027 \rm GeV cm^{-3}$的Einasto配置文件和$ρ_{DM}(R_0) = 0.389 \pm 0.025 \rm GeV cm^{-3}$的NFW。这与$ρ_{DM}(R_0)$约为0.3 GeV cm $^{-3}$且不确定度为2至3倍的标准假设相反。非常精确地确定局部晕密度对于解释直接暗物质探测实验是非常重要的。事实上,我们所产生的结果,加上最近精确测定的本地圆速度,应该是非常有用的相当狭窄的天体物理不确定性直接暗物质检测。

英文摘要:

We present a novel study on the problem of constructing mass models for the Milky Way, concentrating on features regarding the dark matter halo component. We have considered a variegated sample of dynamical observables for the Galaxy, including several results which have appeared recently, and studied a 7- or 8-dimensional parameter space - defining the Galaxy model - by implementing a Bayesian approach to the parameter estimation based on a Markov Chain Monte Carlo method. The main result of this analysis is a novel determination of the local dark matter halo density which, assuming spherical symmetry and either an Einasto or an NFW density profile is found to be around 0.39 GeV cm$^{-3}$ with a 1-$σ$ error bar of about 7%; more precisely we find a $ρ_{DM}(R_0) = 0.385 \pm 0.027 \rm GeV cm^{-3}$ for the Einasto profile and $ρ_{DM}(R_0) = 0.389 \pm 0.025 \rm GeV cm^{-3}$ for the NFW. This is in contrast to the standard assumption that $ρ_{DM}(R_0)$ is about 0.3 GeV cm$^{-3}$ with an uncertainty of a factor of 2 to 3. A very precise determination of the local halo density is very important for interpreting direct dark matter detection experiments. Indeed the results we produced, together with the recent accurate determination of the local circular velocity, should be very useful to considerably narrow astrophysical uncertainties on direct dark matter detection.

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