利用全天费米伽马射线暴监测数据改进无菌中微子暗物质的极限
Improved Limits on Sterile Neutrino Dark Matter using Full-Sky Fermi Gamma-Ray Burst Monitor Data
摘要：
一个~keV质量的无菌中微子是一个很好的暗物质候选者。它的衰变产生的X射线线为X射线望远镜提供了一个独特的目标。我们首次使用费米伽马射线太空望远镜上的伽马射线暴监测器（GBM）来寻找无菌中微子衰变线;我们的分析覆盖了能量范围10-25 keV（无菌中微子质量20-50 keV），这是Chandra，Suzaku，XMM-Newton和INTEGRAL等X射线和伽马射线卫星无法到达的。GBM极宽的视野使银河系暗物质晕的很大一部分能够被探测。经过仔细的数据切割，我们获得了约53天的全天观测数据。我们观察到朝向银河系中心的光子过多，正如天体物理发射所预期的那样。我们在能谱中寻找无菌中微子衰变线，没有发现明显的信号。由此，我们得到了不育中微子混合角的上限作为质量的函数。在无菌中微子质量范围25-40千电子伏，我们提高了以前的上限约一个数量级。更好地了解探测器和天体物理背景，以及探测器的响应，将进一步提高与GBM搜索的灵敏度。
英文摘要：
A sterile neutrino of ~keV mass is a well motivated dark matter candidate. Its decay generates an X-ray line that offers a unique target for X-ray telescopes. For the first time, we use the Gamma-ray Burst Monitor (GBM) onboard the Fermi Gamma-Ray Space Telescope to search for sterile neutrino decay lines; our analysis covers the energy range 10-25 keV (sterile neutrino mass 20-50 keV), which is inaccessible to X-ray and gamma-ray satellites such as Chandra, Suzaku, XMM-Newton, and INTEGRAL. The extremely wide field of view of the GBM enables a large fraction of the Milky Way dark matter halo to be probed. After implementing careful data cuts, we obtain ~53 days of full sky observational data. We observe an excess of photons towards the Galactic Center, as expected from astrophysical emission. We search for sterile neutrino decay lines in the energy spectrum, and find no significant signal. From this, we obtain upper limits on the sterile neutrino mixing angle as a function of mass. In the sterile neutrino mass range 25-40 keV, we improve upon previous upper limits by approximately an order of magnitude. Better understanding of detector and astrophysical backgrounds, as well as detector response, will further improve the sensitivity of a search with the GBM.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
