星际物质与高能宇宙射线相互作用产生弥散γ射线的费米LAT观测
Fermi LAT Observation of Diffuse Gamma-Rays Produced Through Interactions between Local Interstellar Matter and High Energy Cosmic Rays
摘要：
本文报告了大口径望远镜在\textit{Fermi}任务中对第三象限中纬度地区（从$200\arcdeg$到$260\arcdeg$的银河经度$l$和从$22\arcdeg$到$60\arcdeg$的纬度$| b |$）的$γ$ -射线的观测。该地区不包含已知的大分子云，大部分氢原子位于太阳系1千秒差距以内。计算了$γ$射线点源和逆康普顿散射的贡献，并将其相减.在100 MeV ~ 10 GeV的能量范围内，剩余的$γ$射线强度与原子气柱密度呈线性关系.测得的积分$γ$射线发射率分别为100 MeV以上的$(1.63 \pm 0.05) \times 10^{-26} {\rm photons s^{-1} sr^{-1} H\mathchar`-atom^{-1}}$和300 MeV以上的$(0.66 \pm 0.02) \times 10^{-26} {\rm photons s^{-1} sr^{-1} H\mathchar`-atom^{-1}}$，附加系统误差为$\sim 10%$ .在100 MeV-10 GeV的差分发射率同意与直接测量的宇宙射线光谱的基础上，在10%的水平一致的计算。结果表明，在所研究的区域，距太阳系1千秒差距以内的宇宙线核谱与在地球上直接测量的$\sim 10%$以内的星际谱接近。
英文摘要：
Observations by the Large Area Telescope (LAT) on the \textit{Fermi} mission of diffuse $γ$-rays in a mid-latitude region in the third quadrant (Galactic longitude $l$ from $200\arcdeg$ to $260\arcdeg$ and latitude $| b |$ from $22\arcdeg$ to $60\arcdeg$) are reported. The region contains no known large molecular cloud and most of the atomic hydrogen is within 1 kpc of the solar system. The contributions of $γ$-ray point sources and inverse Compton scattering are estimated and subtracted. The residual $γ$-ray intensity exhibits a linear correlation with the atomic gas column density in energy from 100 MeV to 10 GeV. The measured integrated $γ$-ray emissivity is $(1.63 \pm 0.05) \times 10^{-26} {\rm photons s^{-1} sr^{-1} H\mathchar`-atom^{-1}}$ and $(0.66 \pm 0.02) \times 10^{-26} {\rm photons s^{-1} sr^{-1} H\mathchar`-atom^{-1}}$ above 100 MeV and above 300 MeV, respectively, with additional systematic error of $\sim 10%$. The differential emissivity in 100 MeV--10 GeV agrees with calculations based on cosmic ray spectra consistent with those directly measured, at the 10% level. The results obtained indicate that cosmic ray nuclei spectra within 1 kpc from the solar system in regions studied are close to the local interstellar spectra inferred from direct measurements at the Earth within $\sim 10%$.
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