论文标题
由于太阳辐射引起的γ射线和超高能中微子背景抑制
γ-Ray and ultra-high energy neutrino background suppression due to solar radiation
论文作者
论文摘要
太阳在近似空间各向同性分布中排放了大量的光子和中微子。来自阿加拉河外源的弥漫性$γ$ - 砂和超高能量（UHE）中微子可能随后与发射的太阳光子和中微子分别相互作用并消灭。反过来，由于太阳辐射通过$γ$ ray和UHE中微子通量的衰减，这将引起宇宙射线（CR）背景的各向异性。因此，测量这种降低是对电子相互作用的简单而强大的天体物理探针。在这封信中，我们计算了TEV $γ$ -rays的这种各向异性，在地球上（Sun）至少可以是$ \ simeq 10^{ - 4}，（10^{ - 2}）$。地球上伸长角度的光学深度更加集中在太阳周围（$ \ lyssim 10^\ circ $），约为$ 10^{ - 3} $，更大。对于中微子的中微子，中微子的衰减非常小。我们简要讨论了实验的观察前景，例如Fermi Gamma-ray太空望远镜大面积望远镜（Fermi LAT），高海拔水分Cherenkov（HAWC）检测器，大型高海拔空气淋浴天文台（LHAASO），Cherenkov望远镜阵列阵列阵列（CTA）和ICECUPE。还探索了在其他活跃卫星的轨道位置测量$γ$射线衰减的潜力，例如Parker Solar Probe和James Webb太空望远镜（JWST）。
The Sun emits copious amounts of photons and neutrinos in an approximately spatially isotropic distribution. Diffuse $γ$-rays and ultra-high energy (UHE) neutrinos from extragalactic sources may subsequently interact and annihilate with the emitted solar photons and neutrinos respectively. This will in turn induce an anisotropy in the cosmic ray (CR) background due to attenuation of the $γ$-ray and UHE neutrino flux by the solar radiation. Measuring this reduction, therefore, presents a simple and powerful astrophysical probe of electroweak interactions. In this letter we compute such anisotropies for TeV $γ$-rays, which at the Earth (Sun) can be at least $\simeq 10^{-4},(10^{-2})$. The optical depth at Earth for elongation angles more focused around the Sun ($\lesssim 10^\circ$), can be around $10^{-3}$ and larger. Neutrino attenuation is extremely tiny for for PeV scale UHE neutrinos. We briefly discuss observational prospects for experiments such as the Fermi Gamma-Ray Space Telescope Large Area Telescope (Fermi LAT), High-Altitude Water Cherenkov (HAWC) detector, The Large High Altitude Air Shower Observatory (LHAASO), Cherenkov Telescope Array (CTA) and IceCube. The potential for measuring $γ$-ray attenuation at orbital locations of other active satellites such as the Parker Solar Probe and James Webb Space Telescope (JWST) is also explored.
