小熊座矮球状星系朱雀观测中不育中微子的新极限
New Limits on Sterile Neutrinos from Suzaku Observations of the Ursa Minor Dwarf Spheroidal Galaxy
摘要：
我们目前的结果，我们的搜索与辐射衰变的不育中微子，一个动机良好的暗物质的候选人，在朱雀天文台光谱的小熊座矮球状星系的X射线线发射。这些数据代表了对这些极端质量-光系统之一的第一次深入观察，也是第一次使用X射线望远镜进行专门的暗物质搜索。没有这样的发射线是积极的检测，我们放置新的约束组合的不育中微子的质量和活跃的不育中微子振荡混合角。线通量上限是使用基于最大似然的方法，随着缺乏内在的X射线发射，使我们能够最大限度地减少系统性和占那些仍然。我们得到的限制匹配或接近最好的以前的结果在整个1- 20千电子伏的质量范围内从一个单一的朱雀观测。这些都是用来放置在一般情况下，并在假设它们构成所有的暗物质的情况下，与给定的参数的存在不育中微子的约束。允许的范围意味着，不育中微子仍然是构成部分或全部暗物质的可行候选者，也可以解释脉冲星反冲和其他各种天体物理现象。
英文摘要：
We present results of our search for X-ray line emission associated with the radiative decay of the sterile neutrino, a well-motivated dark matter candidate, in Suzaku Observatory spectra of the Ursa Minor dwarf spheroidal galaxy. These data represent the first deep observation of one of these extreme mass-to-light systems and the first dedicated dark matter search using an X-ray telescope. No such emission line is positively detected, and we place new constraints on the combination of the sterile neutrino mass and the active-sterile neutrino oscillation mixing angle. Line flux upper limits are derived using a maximum-likelihood-based approach that, along with the lack of intrinsic X-ray emission, enables us to minimize systematics and account for those that remain. The limits we derive match or approach the best previous results over the entire 1--20 keV mass range from a single Suzaku observation. These are used to place constraints on the existence of sterile neutrinos with given parameters in the general case and in the case where they are assumed to constitute all of the dark matter. The range allowed implies that sterile neutrinos remain a viable candidate to make up some -- or all -- of the dark matter and also explain pulsar kicks and various other astrophysical phenomena.
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