论文标题
Starburst核作为轻型暗物质实验室
Starburst Nuclei as Light Dark Matter Laboratories
论文作者
论文摘要
Starburst星系是高能量伽马射线的良好动机的天体发射器。由于它们的大型磁场将高能质子限制在$ \ sim 10^5 $年中，因此它们是著名的宇宙射线“储层”。在这么长的时间里，宇宙射线的运输可能会受到带有Sub-GEV暗物质的散射的显着影响。在这里，我们指出，这种散射会扭曲宇宙射线频谱，并且可以通过测量宇宙射线通过HADRONIC碰撞来间接观察到失真。当前的伽马射线数据没有显示这种失真的迹象，从而导致质子和暗物质之间的横截面上的严格界限。这些与当前边界相互互补，并且可以通过Cherenkov望远镜阵列的0.1-10 TEV范围内的未来伽马射线测量值进行更大的改进空间，从而可以将限制加强高达两个数量级。
Starburst galaxies are well-motivated astrophysical emitters of high-energy gamma-rays. They are well-known cosmic-ray "reservoirs", thanks to their large magnetic fields which confine high-energy protons for $\sim 10^5$ years. Over such long times, cosmic-ray transport can be significantly affected by scatterings with sub-GeV dark matter. Here we point out that this scattering distorts the cosmic-ray spectrum, and the distortion can be indirectly observed by measuring the gamma-rays produced by cosmic-rays via hadronic collisions. Present gamma-ray data show no sign of such a distortion, leading to stringent bounds on the cross section between protons and dark matter. These are highly complementary with current bounds and have large room for improvement with the future gamma-ray measurements in the 0.1-10 TeV range from the Cherenkov Telescope Array, which can strengthen the limits by as much as two orders of magnitude.
