ABDO, Aous A.; ACKERMANN, Markus; AJELLO, Marco; B. ATWOOD, W.; AXELSSON, Magnus; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; BASTIERI, D.; BAUGHMANN, B.M.; BECHTOL, K.; BELLAZZINI, R.; BERENJI, B.; BLOOM, E.D.; BONAMENTE, E.; BORGLAND, A.W.; BREGEON, J.; BREZ, A.; BRIGIDA, M.; BRUEL, Pascal; BURNETT, T.H.; A. CALIANDRO, G.; A. CAMERON, R.; CARAVEO, P. A.; CARLSON, P.; CASANDJIAN, J.M.; CECCHI, C.; CELIK, O.; CHEKHTMAN, A.; CHEUNG, C.C.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; CONRAD, J.; CUTINI, S.; DERMER, C.D.; DE ANGELIS, A.; DE PALMA, F.; DIGEL, S.W.; DO COUTO E SILVA, E.; DRELL, P.S.; DUBOIS, R.; DUMORA, D.; FARNIER, C.; FAVUZZI, C.; FEGAN, S.J.; FOCKE, W.B.; FRAILIS, M.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIEBELS, B.; GIGLIETTO, N.; GIORDANO, F.; GLANZMAN, T.; GODFREY, G.; GRENIER, I.A.; GRONDIN, M.-H.; GROVE, J.E.; GUILLEMOT, L.; GUIRIEC, S.; HAMADA, N.; HARDING, A.K.; HAYASHIDA, M.; HUGUES, R.E.; JOHANSSON, G.; JOHNSON, A.S.; JOHNSON, R.P.; JOHNSON, W.N.; KAMAE, T.; KATAGIRI, H.; KAWAI, N.; KERR, M.; KNÖDLSEDER, Jürgen; KOCIAN, M. L.; KUEHN, F.; KUSS, M.; LANDE, J.; LATRONICO, L.; LEMOINE-GOUMARD, M.; LONGO, F.; LOPARCO, F.; LOTT, B.; LOVELLETTE, M.N.; LUBRANO, P.; MAKEEV, A.; MAZZIOTTA, M.N.; MCENERY, J.E.; MEURER, C.; MICHELSON, P.F.; MITTHUMSIRI, W.; MIZUNO, T.; MOISEEV, A.A.; MONTE, C.; MONZANI, M.E.; MORSELLI, A.; MOSKALENKO, I.V.; MURGIA, S.; NOLAN, P.L.; NORRIS, J.P.; NUSS, E.; OHSUGI, T.; OKUMURA, A.; OMODEI, N.; ORLANDO, E.; ORMES, J.F.; OZAKI, M.; PANEQUE, D.; PANETTA, J.H.; PARENT, D.; PEPE, M.; PESCE-ROLLINS, M.; PIRON, F.; POHL, M.; PORTER, T. A.; RAINÒ, S.; RANDO, R.; RAZZANO, M.; REIMER, A.; REIMER, O.; REPOSEUR, T.; RITZ, S.; ROCHESTER, L. S.; RODRIGUEZ, A. Y.; RYDE, F.; SADROSINSKI, H.F-W.; SANCHEZ, D.; SANDER, A.; PARKINSON, P. M. Saz; SCHALK, T.L.; SELLERHOLM, A.; SGRO, G.; SMITH, D.A.; SMITH, P.D.; SPANDRE, G.; SPINELLI, P.; STARCK, Jean-Luc; STECKER, F. W.; STRICKMAN, M. S.; STRONG, A.W.; SUSON, D. J.; TAJIMA, H.; TAKAHASHI, H.; TAKAHASHI, T.; TANAKA, T.; THAYER, J.B.; THAYER, J.G.; THOMPSON, D.J.; TIBALDO, L.; TORRES, D. F.; TOSTI, G.; TRAMACERE, A.; UCHIYAMA, Y.; USHER, T. L.; VASILEIOU, V.; VILCHEZ, N.; VITALE, V.; WAITE, A. P.; WANG, P.; WINER, B. L.; WOOD, K. S.; YLINEN, T.; ZIEGLER, M.

doi:10.1088/0004-637X/703/2/1249

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The Astrophysical Journal. 2009-10-01, vol. 703, p. 1249-1256

American Astronomical Society

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Observations by the Large Area Telescope (LAT) on the \textit{Fermi} mission of diffuse $\gamma$-rays in a mid-latitude region in the third quadrant (Galactic longitude $l$ from $200\arcdeg$ to $260\arcdeg$ and latitude $| b |$ from $22\arcdeg$ to $60\arcdeg$) are reported. The region contains no known large molecular cloud and most of the atomic hydrogen is within 1 kpc of the solar system. The contributions of $\gamma$-ray point sources and inverse Compton scattering are estimated and subtracted. The residual $\gamma$-ray intensity exhibits a linear correlation with the atomic gas column density in energy from 100 MeV to 10 GeV. The measured integrated $\gamma$-ray emissivity is $(1.63 \pm 0.05) \times 10^{-26} {\rm photons s^{-1} sr^{-1} H\mathchar`-atom^{-1}}$ and $(0.66 \pm 0.02) \times 10^{-26} {\rm photons s^{-1} sr^{-1} H\mathchar`-atom^{-1}}$ above 100 MeV and above 300 MeV, respectively, with additional systematic error of $\sim 10%$. The differential emissivity in 100 MeV--10 GeV agrees with calculations based on cosmic ray spectra consistent with those directly measured, at the 10% level. The results obtained indicate that cosmic ray nuclei spectra within 1 kpc from the solar system in regions studied are close to the local interstellar spectra inferred from direct measurements at the Earth within $\sim 10%$.< Réduire

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cosmic rays

diffuse radiation

gamma rays: observations

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Fermi LAT Observation of Diffuse Gamma-Rays Produced Through Interactions between Local Interstellar Matter and High Energy Cosmic Rays

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