Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
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DOI：
10.1103/physrevd.95.082007
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发表时间：
2017-04-21
影响因子：
5
通讯作者：
Zimmer, S.
中科院分区：
文献类型：
--
作者：
Abdollahi, S.;Ackermann, M.;Zimmer, S.
我们用费米大面积望远镜收集了近7年的数据，对7 GeV和2 TeV之间的宇宙射线电子+正电子谱进行了测量。我们发现，谱与断能约为50 GeV的断能幂律很好地拟合。在50 GeV以上，光谱可以用单一幂律很好地描述，光谱指数为3.07 +/- 0.02 (stat +/- syst) +/- 0.04（能量测量）。在95% CL时，排除指数截止值低于1.8 TeV。
We present a measurement of the cosmic-ray electron + positron spectrum between 7 GeV and 2 TeV performed with almost seven years of data collected with the Fermi Large Area Telescope. We find that the spectrum is well fit by a broken power law with a break energy at about 50 GeV. Above 50 GeV, the spectrum is well described by a single power law with a spectral index of 3.07 +/- 0.02 (stat +/- syst) +/- 0.04 (energy measurement). An exponential cutoff lower than 1.8 TeV is excluded at 95% CL.