Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes
2009 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 103, no 25Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2009. Vol. 103, no 25
egret observations, spectra, galaxy
IdentifiersURN: urn:nbn:se:kth:diva-19069DOI: 10.1103/PhysRevLett.103.251101ISI: 000272958300005ScopusID: 2-s2.0-72449164032OAI: oai:DiVA.org:kth-19069DiVA: diva2:337116
QC 201005252010-08-052010-08-052011-02-16Bibliographically approved