First Analysis of Jupiter in Gamma Rays and a New Search for Dark Matter.
First Analysis of Jupiter in Gamma Rays and a New Search for Dark Matter.
复制标题
伽马射线中木星的首次分析和对暗物质的新搜索。
DOI：
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发表时间：
2021
影响因子：
8.6
通讯作者：
T. Linden
中科院分区：
文献类型：
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作者：
R. K. Leane;T. Linden
我们提出了第一个专门的木星γ射线分析，使用费米望远镜12年的数据。我们没有发现强有力的γ射线发射证据，并设定了木星γ射线通量的上限为10^{-9} GeV cm^{-2} s^{-1}。我们指出，木星是一个有利的暗物质（DM）的目标，由于其大的表面积（与其他太阳系行星相比），和冷的核心温度（与太阳相比）。这些特性使木星能够捕获和保留较轻的DM，提供了一个亚GeV DM的补充探测器。因此，我们在木星中识别并执行新的寻找DM源γ射线，其中DM湮灭为长寿命粒子，这些粒子可以逃离木星表面并衰变为γ射线。因此，我们将DM-质子散射截面限制在约10^{-40} cm^{2}，表明木星比直接探测灵敏10个数量级。这种灵敏度是在假设介质衰变长度足以逃离木星，以及DM捕获和湮灭之间的平衡的情况下达到的;灵敏度可以根据DM模型而降低。我们的工作激励了后续研究与即将到来的MeV望远镜，如AMEGO和e-ASTROGAM。
We present the first dedicated γ-ray analysis of Jupiter, using 12 years of data from the Fermi Telescope. We find no robust evidence of γ-ray emission, and set upper limits of ∼10^{-9} GeV cm^{-2} s^{-1} on the Jovian γ-ray flux. We point out that Jupiter is an advantageous dark matter (DM) target due to its large surface area (compared with other solar system planets), and cool core temperature (compared with the Sun). These properties allow Jupiter to both capture and retain lighter DM, providing a complementary probe of sub-GeV DM. We therefore identify and perform a new search for DM-sourced γ-rays in Jupiter, where DM annihilates to long-lived particles, which can escape the Jovian surface and decay into γ rays. We consequently constrain DM-proton scattering cross sections as low as about 10^{-40} cm^{2}, showing Jupiter is up to 10 orders of magnitude more sensitive than direct detection. This sensitivity is reached under the assumption that the mediator decay length is sufficient to escape Jupiter, and the equilibrium between DM capture and annihilation; sensitivities can be lower depending on the DM model. Our work motivates follow-up studies with upcoming MeV telescopes such as AMEGO and e-ASTROGAM.