Fermi large area telescope measurements of the diffuse gamma-ray emission at intermediate galactic latitudes.
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, > or approximately equal 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 < or = |b| < or = 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.
Abdo
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Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA.
Ackermann
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Ajello
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Anderson
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Atwood
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Axelsson
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Baldini
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Ballet
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Barbiellini
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Bastieri
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Baughman
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Bechtol
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Bellazzini
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Berenji
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Blandford
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Bloom
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Bonamente
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Borgland
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Bregeon
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Brez
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Brigida
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Bruel
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Burnett
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Caliandro
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Cameron
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Caraveo
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Casandjian
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Cecchi
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Charles
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Chekhtman
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Cheung
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Chiang
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Ciprini
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Claus
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Cohen-Tanugi
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Conrad
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Dereli
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Dermer
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de Angelis
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de Palma
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Digel
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Di Bernardo
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Dormody
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do Couto e Silva
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Drell
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Dubois
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Dumora
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Edmonds
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Farnier
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Favuzzi
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Fegan
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Focke
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Frailis
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Fukazawa
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Funk
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Fusco
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Gaggero
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Gargano
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Gehrels
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Germani
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Giebels
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Giglietto
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Giordano
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Glanzman
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Godfrey
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Grenier
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Grondin
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Grove
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Guillemot
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Guiriec
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Hanabata
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Harding
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Hayashida
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Hays
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Hughes
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Jóhannesson
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Johnson
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Johnson
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Johnson
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Johnson
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Kamae
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Katagiri
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Kataoka
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Kawai
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Kerr
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Knödlseder
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Kocian
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Kuehn
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Kuss
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Lande
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Latronico
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Longo
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Loparco
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Lott
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Lovellette
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Lubrano
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Madejski
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Makeev
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Mazziotta
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McConville
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McEnery
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Meurer
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Michelson
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Mitthumsiri
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Mizuno
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Moiseev
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Monte
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Monzani
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Morselli
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Moskalenko
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Murgia
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Nolan
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Ohsugi
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Okumura
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Omodei
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Ormes
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Paneque
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Panetta
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Parent
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Pepe
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Rando
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Razzano
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Reimer
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Reimer
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Reposeur
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Ritz
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Rodriguez
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Ryde
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Sadrozinski
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Scargle
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Sellerholm
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Smith
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Smith
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Spinelli
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Starck
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Stecker
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Strickman
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Takahashi
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Thayer
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Thompson
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Torres
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Uchiyama
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Usher
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Vilchez
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Waite
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Wood
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Ziegler
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