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arXiv 1712.04597astro-ph.COhep-ph
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由Milky Way矮星系相空间密度确定共振产生不育中微子的边界

Bounds on Resonantly-Produced Sterile Neutrinos from Phase Space Densities of Milky Way Dwarf Galaxies

Mei-Yu Wang, John F. Cherry, Shunsaku Horiuchi, Louis E. Strigari

摘要:

我们研究了银河系矮球状星系(dSphs)相空间密度中共振产生的无菌中微子暗物质的边界。边界的结果从推导的暗物质粗粒度的相空间密度从恒星的运动学,这使我们能够探索从一些最紧凑的dSphs的边界,而不会遭受分辨率的限制,从N体模拟,传统的方法。我们发现,最强的约束来自非常紧凑的dSphs,如Draco II和Segue 1。我们还预测了一些dSPH候选人,还没有相关的恒星运动学数据的约束力,并表明,他们可以提高边界,如果他们被证实是高度暗物质为主的系统。我们的研究结果表明,紧凑的dSphs提供了重要的约束不育中微子暗物质,可与其他方法相比,使用银河系卫星计数。特别是,如果从目前或未来的调查中发现更紧凑的系统,如LSST或HSC,应该有可能测试解释3.5 keV X射线线信号与7.1 keV无菌中微子粒子衰变的模型。

英文摘要:

We examine the bounds on resonantly-produced sterile neutrino dark matter from phase-space densities of Milky Way dwarf spheroidal galaxies (dSphs). The bounds result from a derivation of the dark matter coarse-grained phase-space density from the stellar kinematics, which allows us to explore bounds from some of the most compact dSphs without suffering the resolution limitation from N-body simulations that conventional methods have. We find that the strongest constraints come from very compact dSphs, such as Draco II and Segue 1. We additionally forecast the constraining power of a few dSph candidates that do not yet have associated stellar kinematic data, and show that they can improve the bounds if they are confirmed to be highly dark matter dominated systems. Our results demonstrate that compact dSphs provide important constraints on sterile neutrino dark matter that are comparable to other methods using as Milky Way satellite counts. In particular, if more compact systems are discovered from current or future surveys such as LSST or HSC, it should be possible to test models that explain the 3.5 keV X-ray line signal with a 7.1 keV sterile neutrino particle decay.

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