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arXiv 2104.02068astro-ph.HEastro-ph.EPhep-ph
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木星伽马射线的首次分析及暗物质的新搜索

First Analysis of Jupiter in Gamma Rays and a New Search for Dark Matter

Rebecca K. Leane, Tim Linden

AI总结:

利用费米望远镜12年数据首次分析木星γ射线,未发现发射证据,但通过暗物质湮灭搜索,将散射截面限制在10^{-40} cm^2,灵敏度比直接探测高十个数量级。

摘要:

我们利用费米望远镜12年的数据,对木星进行了首次专门的γ射线分析。我们没有发现γ射线发射的可靠证据,并将木星γ射线通量的上限设定为约10^{-9} GeV cm^{-2} s^{-1}。我们指出,木星由于其巨大的表面积(与其他太阳系行星相比)和凉爽的核心温度(与太阳相比),是一个有利的暗物质(DM)目标。这些特性使木星能够捕获并保留较轻的暗物质,为亚GeV暗物质提供了补充探测手段。因此,我们确定并执行了一项针对木星暗物质来源γ射线的新搜索,其中暗物质湮灭为长寿命粒子,这些粒子可以逃逸木星表面并衰变为γ射线。因此,我们将暗物质-质子散射截面限制在低至约10^{-40} cm^2,表明木星的灵敏度比直接探测高出多达十个数量级。该灵敏度是在假设中介子衰变长度足以逃逸木星以及暗物质捕获与湮灭之间达到平衡的条件下达到的;灵敏度可能因暗物质模型的不同而降低。我们的工作推动了即将推出的MeV望远镜(如AMEGO和e-ASTROGAM)的后续研究。

英文摘要:

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 $\sim10^{-9}~$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 to other solar system planets), and cool core temperature (compared to 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 ten 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.

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。

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