标题： 附近恒星爆发星系NGC 253弥散TeV伽马射线辐射的探测 显示英文标题

标题： Detection of diffuse TeV gamma-ray emission from the nearby starburst galaxy NGC 253

摘要： 我们报告了邻近正常螺旋星系 NGC 253 的 TeV γ 射线观测结果。距离为$\sim$2.5 兆秒差距时，NGC 253 是最近的星暴星系之一。这种相对接近的距离，加上星系内较高的恒星形成率，使其成为良好的 TeV γ 射线源候选者。该观测于 2000 年和 2001 年使用 CANGAROO-II 10 米成像大气切伦科夫望远镜进行。TeV γ 射线辐射以$\sim 11\sigma$置信水平被探测到，能量为$>$0.5 TeV 时的流量为$(7.8 \pm 2.5)\times 10^{-12} {\rm cm}^{-2} {\rm sec}^{-1}$。数据表明，发射区域比望远镜的点扩散函数更宽。 显示英文摘要

摘要： We report the TeV gamma-ray observations of the nearby normal spiral galaxy NGC 253. At a distance of $\sim$2.5 Mpc, NGC 253 is one of the nearest starburst galaxies. This relative closeness, coupled with the high star formation rate in the galaxy, make it a good candidate TeV gamma-ray source. Observations were carried out in 2000 and 2001 with the CANGAROO-II 10 m imaging atmospheric Cerenkov telescope. TeV gamma-ray emission is detected at the $\sim 11\sigma$ level with a flux of $(7.8 \pm 2.5)\times 10^{-12} {\rm cm}^{-2} {\rm sec}^{-1}$ at energies $>$0.5 TeV. The data indicate that the emission region is broader than the point spread function of our telescope.