仙后座和仙王座的费米观测：银河系外的gamma-ray弥散辐射
Fermi observations of Cassiopeia and Cepheus: gamma-ray diffuse emission in the outer Galaxy
摘要：
我们利用费米大天区望远镜（LAT）的测量研究了银河系第二象限（100度< l < 145度和-15度< b < 30度）区域的星际伽马射线发射。这一区域包括仙后座、仙王座和北极星耀斑的黄金带云，以及几个旋臂中距离较远的大型原子和分子复合物。本地臂、英仙座臂和外臂之间的运动学速度分离良好，并且每个臂中都存在大质量的复合物，使得这个区域非常适合探测太阳圈以外的星际介质的伽马射线发射。LAT前所未有的灵敏度和角分辨率提供了更好的约束宇宙射线密度的梯度和增加的CO到H2的转换因子，Xco，在外星系。
英文摘要：
We have used measurements by the Fermi Large Area Telescope (LAT) to study the interstellar gamma-ray emission in a region of the second Galactic quadrant, at 100 deg < l < 145 deg and -15 deg < b < 30 deg. This region encompasses the prominent Gould-Belt clouds of Cassiopeia, Cepheus, and the Polaris flare, as well as large atomic and molecular complexes at larger distances in several spiral arms. The good kinematic separation in velocity between the local, Perseus, and outer arms, and the presence of massive complexes in each, make this region very well suited to probe the gamma-ray emission from the interstellar medium beyond the solar circle. The unprecedented sensitivity and angular resolution of the LAT provide improved constraints on the gradient of the cosmic-ray densities and on the increase of the CO-to-H2 conversion factor, Xco, in the outer Galaxy.
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