标题： 通过费米大面积望远镜探测脉冲星风星云 HESS J1825-137 显示英文标题

标题： Detection of the Pulsar Wind Nebula HESS J1825-137 with the Fermi Large Area Telescope

摘要： 我们宣布使用费米大面积望远镜（LAT）20个月的巡天数据，发现了来自典型TeV脉冲星风星云HESS J1825-137的1-100 GeV伽马射线辐射。 LAT检测到的伽马射线辐射在空间上显著扩展，对于假设的高斯模型，最佳拟合均方根扩展为sigma = 0.56{\deg } $\pm$ 0.07{\deg }。 这个源的1-100 GeV LAT谱可以用一个谱指数为1.38 $\pm$ 0.12 $\pm$ 0.16 的幂律来很好地描述，且1 GeV以上的积分通量为(6.50 $\pm$ 0.21 $\pm$ 3.90) x 10^{-9} cm^{-2} s^{-1}。 第一个误差表示拟合参数的统计误差，而第二个误差是系统不确定性。 详细的形态和光谱分析为脉冲星风星云系统的能量和磁场带来了新的限制。 GeV辐射的空间扩展和硬谱与由脉冲星PSR J1826-1334驱动的冷却限制星云中GeV-TeV辐射的逆康普顿起源图景一致。 显示英文摘要

摘要： We announce the discovery of 1 - 100 GeV gamma-ray emission from the archetypal TeV pulsar wind nebula HESS J1825-137 using 20 months of survey data from the Fermi Large Area Telescope (LAT). The gamma-ray emission detected by the LAT is significantly spatially extended, with a best-fit rms extension of sigma = 0.56{\deg} $\pm$ 0.07{\deg} for an assumed Gaussian model. The 1 - 100 GeV LAT spectrum of this source is well described by a power-law with a spectral index of 1.38 $\pm$ 0.12 $\pm$ 0.16 and an integral flux above 1 GeV of (6.50 $\pm$ 0.21 $\pm$ 3.90) x 10^{-9} cm^{-2} s^{-1}. The first errors represent the statistical errors on the fit parameters, while the second ones are the systematic uncertainties. Detailed morphological and spectral analyses bring new constraints on the energetics and magnetic field of the pulsar wind nebula system. The spatial extent and hard spectrum of the GeV emission are consistent with the picture of an inverse Compton origin of the GeV-TeV emission in a cooling-limited nebula powered by the pulsar PSR J1826-1334.