期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.251101
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资金
- NASA [NNX09AC15G]
- DOE in the United States
- CEA/Irfu and IN2P3/CNRS in France
- ASI and INFN in Italy
- MEXT
- KEK
- JAXA in Japan
- K.A. Wallenberg Foundation
- Swedish Research Council
- National Space Board in Sweden
- INAF in Italy
- NASA [NNX09AC15G, 120319] Funding Source: Federal RePORTER
- ICREA Funding Source: Custom
The diffuse galactic gamma-ray emission is produced by cosmic rays (CRs) interacting with the interstellar gas and radiation field. Measurements by the Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on the Compton Gamma-Ray Observatory indicated excess gamma-ray emission greater than or similar to 1 GeV relative to diffuse galactic gamma-ray emission models consistent with directly measured CR spectra (the so-called EGRET GeV excess). The Large Area Telescope (LAT) instrument on the Fermi Gamma-Ray Space Telescope has measured the diffuse gamma-ray emission with improved sensitivity and resolution compared to EGRET. We report on LAT measurements for energies 100 MeV to 10 GeV and galactic latitudes 10 degrees <|b|< 20 degrees. The LAT spectrum for this region of the sky is well reproduced by a diffuse galactic gamma-ray emission model that is consistent with local CR spectra and inconsistent with the EGRET GeV excess.
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