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Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes
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2009 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 103, no 25Article in journal (Refereed) Published
Abstract [en]

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
Keyword [en]
egret observations, spectra, galaxy
Identifiers
URN: urn:nbn:se:kth:diva-19069DOI: 10.1103/PhysRevLett.103.251101ISI: 000272958300005Scopus ID: 2-s2.0-72449164032OAI: oai:DiVA.org:kth-19069DiVA: diva2:337116
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-02-16Bibliographically approved

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Ryde, Felix

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