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arXiv 2001.04454astro-ph.GAastro-ph.CO
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从Milky Way的旋转曲线对模糊暗物质质量的约束

Constraint on the mass of fuzzy dark matter from the rotation curve of the Milky Way

Alireza Maleki, Shant Baghram, Sohrab Rahvar

摘要:

模糊暗物质(FDM)是最近研究暗物质的模型之一。根据这个模型,暗物质是由非常轻的标量粒子组成的,在星系尺度上具有相当大的量子力学效应,这解决了冷暗物质(CDM)的许多问题。在这里,我们使用的银河系(MW)的旋转曲线的观测数据比较FDM和CDM模型的结果。我们发现FDM在靠近凸起中心的旋转曲线上增加了一个局部峰,其位置和幅度取决于FDM粒子的质量。通过用FDM的期望值拟合观测到的转动曲线,我们发现FDM的质量为$m = 2.5^{+3.6}_{-2.0} \times10^{-21}$ eV。我们注意到,MW旋转曲线的局部峰值也可以用MW星系的CDM模型和额外的内凸模型来解释。我们的结论是,FDM模型解释了这个峰值,而不需要额外的结构的凸起。

英文摘要:

Fuzzy Dark Matter (FDM) is one of the recent models for dark matter. According to this model, dark matter is made of very light scalar particles with considerable quantum mechanical effects on the galactic scale, which solves many problems of the cold dark matter (CDM). Here we use the observed data from the rotation curve of the Milky Way (MW) Galaxy to compare the results from FDM and CDM models. We show FDM adds a local peak on the rotation curve close to the center of the bulge, where its position and amplitude depend on the mass of FDM particles. By fitting the observed rotation curve with our expectation from FDM, we find that the mass of FDM is $m = 2.5^{+3.6}_{-2.0} \times10^{-21}$eV. We note that the local peak of the rotation curve in MW can also be explained in the CDM model with an extra inner bulge model for the MW Galaxy. We conclude that the FDM model explains this peak without a need for extra structure for the bulge.

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