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Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes
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2009 (Engelska)Ingår i: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 103, nr 25, s. 1101-Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2009. Vol. 103, nr 25, s. 1101-
Nyckelord [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
Tillgänglig från: 2009-12-28 Skapad: 2009-12-28 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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Av författaren/redaktören
Axelsson, M.Conrad, J.Sellerholm, A.
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Institutionen för astronomiFysikum
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Physical Review D. Particles and fields

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