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Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes

Abdo AA
•
Ackermann M
•
Ajello M
altro
Ziegler M
2009
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
Abstract
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.
DOI
10.1103/PhysRevLett.103.251101
WOS
WOS:000272958300005
SCOPUS
2-s2.0-72449164032
Archivio
http://hdl.handle.net/11390/878149
Diritti
metadata only access
Web of Science© citazioni
159
Data di acquisizione
Jun 8, 2022
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