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Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes
Vise andre og tillknytning
2009 (engelsk)Inngår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 103, nr 25, s. 1101-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The diffuse galactic γ-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 γ-ray emission ≳1GeV relative to diffuse galactic γ-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 γ-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°≤|b|≤20°. The LAT spectrum for this region of the sky is well reproduced by a diffuse galactic γ-ray emission model that is consistent with local CR spectra and inconsistent with the EGRET GeV excess.

sted, utgiver, år, opplag, sider
2009. Vol. 103, nr 25, s. 1101-
Emneord [en]
gamma-ray, Composition, energy spectra and interactions, Cosmic rays
Identifikatorer
URN: urn:nbn:se:su:diva-33761DOI: 10.1103/PhysRevLett.103.251101ISI: 000272958300005OAI: oai:DiVA.org:su-33761DiVA, id: diva2:283461
Tilgjengelig fra: 2009-12-28 Laget: 2009-12-28 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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Axelsson, M.Conrad, J.Sellerholm, A.
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