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. 2009 Dec 18;103(25):251101.
doi: 10.1103/PhysRevLett.103.251101. Epub 2009 Dec 16.

Fermi large area telescope measurements of the diffuse gamma-ray emission at intermediate galactic latitudes

A A Abdo  1 , M Ackermann, M Ajello, B Anderson, W B Atwood, M Axelsson, L Baldini, J Ballet, G Barbiellini, D Bastieri, B M Baughman, K Bechtol, R Bellazzini, B Berenji, R D Blandford, E D Bloom, E Bonamente, A W Borgland, J Bregeon, A Brez, M Brigida, P Bruel, T H Burnett, G A Caliandro, R A Cameron, P A Caraveo, J M Casandjian, C Cecchi, E Charles, A Chekhtman, C C Cheung, J Chiang, S Ciprini, R Claus, J Cohen-Tanugi, J Conrad, H Dereli, C D Dermer, A de Angelis, F de Palma, S W Digel, G Di Bernardo, M Dormody, E do Couto e Silva, P S Drell, R Dubois, D Dumora, Y Edmonds, C Farnier, C Favuzzi, S J Fegan, W B Focke, M Frailis, Y Fukazawa, S Funk, P Fusco, D Gaggero, F Gargano, N Gehrels, S Germani, B Giebels, N Giglietto, F Giordano, T Glanzman, G Godfrey, I A Grenier, M-H Grondin, J E Grove, L Guillemot, S Guiriec, Y Hanabata, A K Harding, M Hayashida, E Hays, R E Hughes, G Jóhannesson, A S Johnson, R P Johnson, T J Johnson, W N Johnson, T Kamae, H Katagiri, J Kataoka, N Kawai, M Kerr, J Knödlseder, M L Kocian, F Kuehn, M Kuss, J Lande, L Latronico, F Longo, F Loparco, B Lott, M N Lovellette, P Lubrano, G M Madejski, A Makeev, M N Mazziotta, W McConville, J E McEnery, C Meurer, P F Michelson, W Mitthumsiri, T Mizuno, A A Moiseev, C Monte, M E Monzani, A Morselli, I V Moskalenko, S Murgia, P L Nolan, E Nuss, T Ohsugi, A Okumura, N Omodei, E Orlando, J F Ormes, D Paneque, J H Panetta, D Parent, V Pelassa, M Pepe, M Pesce-Rollins, F Piron, T A Porter, S Rainò, R Rando, M Razzano, A Reimer, O Reimer, T Reposeur, S Ritz, A Y Rodriguez, M Roth, F Ryde, H F-W Sadrozinski, D Sanchez, A Sander, P M Saz Parkinson, J D Scargle, A Sellerholm, C Sgrò, D A Smith, P D Smith, G Spandre, P Spinelli, J-L Starck, F W Stecker, E Striani, M S Strickman, A W Strong, D J Suson, H Tajima, H Takahashi, T Tanaka, J B Thayer, J G Thayer, D J Thompson, L Tibaldo, D F Torres, G Tosti, A Tramacere, Y Uchiyama, T L Usher, V Vasileiou, N Vilchez, V Vitale, A P Waite, P Wang, B L Winer, K S Wood, T Ylinen, M Ziegler; Fermi LAT Collaboration
Affiliations

Fermi large area telescope measurements of the diffuse gamma-ray emission at intermediate galactic latitudes

A A Abdo et al. Phys Rev Lett. .

Abstract

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.

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