太阳所在位置的暗物质密度
The dark matter density at the Sun's location
摘要：
我们推导出的暗物质密度在太阳的位置（rho_0）没有全球质量建模的银河系的值。所提出的方法依赖于离心平衡的局部方程，并且独立于i）暗物质密度轮廓的形状，ii）从星系中心到维里半径的旋转曲线的知识，以及iii）凸起/盘/暗晕质量分解的不确定性和非唯一性。结果可以用解析形式给出。它明确地包括对相关观测量的依赖性，并考虑到它们的不确定性。通过采用这些参考的最新值，我们发现rho_0 = 0.43（11）（10）GeV/cm 3，其中引用的不确定性分别是由于太阳位置的圆速度的斜率和该半径与恒星指数薄盘的长度尺度之间的比率的不确定性。我们得到一个可靠的估计rho_0，此外，准备考虑到任何未来的变化/改进的措施，它依赖于观测量。
英文摘要：
We derive the value of the dark matter density at the Sun's location (rho_0) without globally mass-modeling the Galaxy. The proposed method relies on the local equation of centrifugal equilibrium and is independent of i) the shape of the dark matter density profile, ii) knowledge of the rotation curve from the galaxy center out to the virial radius, and iii) the uncertainties and the non-uniqueness of the bulge/disk/dark halo mass decomposition. The result can be obtained in analytic form. It explicitly includes the dependence on the relevant observational quantities and takes their uncertainties into account. By adopting the reference, state-of-the-art values for these, we find rho_0 = 0.43(11)(10)GeV/cm3, where the quoted uncertainties are respectively due to the uncertainty in the slope of the circular-velocity at the Sun location and the ratio between this radius and the length scale of the stellar exponential thin disk. We obtain a reliable estimate of rho_0, that, in addition, is ready to take into account any future change/improvement in the measures of the observational quantities it depends on.
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