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Abdo, A. A; Ajello, M; Atwood, W. B; Baldini, L; Baughman, B. M; Bechtol, K; Bloom, E. D; Bonamente, E; Borgland, A. W; Bregeon, J; Brigida, M; Burnett, T. H; Caliandro, G. A; Cameron, R. A; Caraveo, P. A; Carlson, P; Cecchi, C; Cheung, C. C; Ciprini, S; Claus, R; Cohen-Tanugi, J; Conrad, J; Dermer, C. D; de Angelis, A; de Palma, F; Digel, S. W; Silva, E. do Couto e; Drell, P. S; Dumora, D; Fegan, S. J; Focke, W. B; Frailis, M; Funk, S; Fusco, P; Gargano, F; Germani, S; Giebels, B; Giglietto, N; Grenier, I. A; Guillemot, L; Guiriec, S; Hanabata, Y; Hayashida, M; Hughes, R. E; Johnson, A. S; Johnson, R. P; Johnson, W. N; Kamae, T; Kawai, N; Kerr, M; Knödlseder, J; Kuehn, F; Lande, J; Lemoine-Goumard, M; Longo, F; Lovellette, M. N; Michelson, P. F; Mitthumsiri, W; Mizuno, T; Monzani, M. E; Moskalenko, I. V; Murgia, S; Nuss, E; Ohsugi, T; Orlando, E; Ormes, J. F; Paneque, D; Parent, D; Piron, F; Pohl, M; Porter, T. A; Reimer, A; Reimer, O; Ritz, S; Rodriguez, A. Y; Ryde, F; Sadrozinski, H. F.-W; Sanchez, D; Sander, A; Schalk, T. L; Sellerholm, A; Smith, D. A; Smith, P. D; Spinelli, P; Strickman, M. S; Suson, D. J; Tajima, H; Takahashi, H; Takahashi, T; Thayer, J. G; Tibaldo, L; Torres, D. F; Tosti, G; Tramacere, A; Vasileiou, V; Vitale, V; Waite, A. P; Wang, P; Wood, K. S; Ziegler, M
The Astrophysical journal, 10/2009, Volume: 703, Issue: 2Journal Article
Observations by the Large Area Telescope (LAT) on the Fermi mission of diffuse Delta *g-rays in a mid-latitude region in the third quadrant (Galactic longitude l from 200 deg to 260 deg and latitude |b| from 22 deg to 60 deg ) 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 Delta *g-ray point sources and inverse Compton scattering are estimated and subtracted. The residual Delta *g-ray intensity exhibits a linear correlation with the atomic gas column density in energy from 100 MeV to 10 GeV. The measured integrated Delta *g-ray emissivity is (1.63 +/- 0.05) X 10-26 photons s-1sr-1 H-atom-1 and (0.66 +/- 0.02) X 10-26 photons s-1sr-1 H-atom-1 above 100 MeV and above 300 MeV, respectively, with an additional systematic error of ~10%. The differential emissivity from 100 MeV to 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 ~10%.
