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The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
- Ackermann, M. (author)
- Ajello, M. (author)
- Albert, A. (author)
- show more...
- Atwood, W. B. (author)
- Baldini, L. (author)
- Ballet, J. (author)
- Barbiellini, G. (author)
- Bastieri, D. (author)
- Bechtol, K. (author)
- Bellazzini, R. (author)
- Bissaldi, E. (author)
- Blandford, R. D. (author)
- Bloom, E. D. (author)
- Bottacini, E. (author)
- Brandt, T. J. (author)
- Bregeon, J. (author)
- Bruel, P. (author)
- Buehler, R. (author)
- Buson, S. (author)
- Caliandro, G. A. (author)
- Cameron, R. A. (author)
- Caragiulo, M. (author)
- Caraveo, P. A. (author)
- Cavazzuti, E. (author)
- Cecchi, C. (author)
- Charles, E. (author)
- Chekhtman, A. (author)
- Chiang, J. (author)
- Chiaro, G. (author)
- Ciprini, S. (author)
- Claus, R. (author)
- Cohen-Tanugi, J. (author)
- Cuoco, A. (author)
- Cutini, S. (author)
- D'Ammando, F. (author)
- de Angelis, A. (author)
- de Palma, F. (author)
- Dermer, C. D. (author)
- Digel, S. W. (author)
- do Couto e Silva, E. (author)
- Drell, P. S. (author)
- Favuzzi, C. (author)
- Ferrara, E. C. (author)
- Focke, W. B. (author)
- Franckowiak, A. (author)
- Fukazawa, Y. (author)
- Funk, S. (author)
- Fusco, P. (author)
- Gargano, F. (author)
- Gasparrini, D. (author)
- Germani, S. (author)
- Giglietto, N. (author)
- Giommi, P. (author)
- Giordano, F. (author)
- Giroletti, M. (author)
- Godfrey, G. (author)
- Gomez-Vargas, G. A. (author)
- Grenier, I. A. (author)
- Guiriec, S. (author)
- Gustafsson, M. (author)
- Hadasch, D. (author)
- Hayashi, K. (author)
- Hays, E. (author)
- Hewitt, J. W. (author)
- Ippoliti, P. (author)
- Jogler, T. (author)
- Johannesson, G. (author)
- Johnson, A. S. (author)
- Johnson, W. N. (author)
- Kamae, T. (author)
- Kataoka, J. (author)
- Knoedlseder, J. (author)
- Kuss, M. (author)
- Latronico, L. (author)
- Li, J. (author)
- Li, L. (author)
- Longo, F. (author)
- Loparco, F. (author)
- Lott, B. (author)
- Lovellette, M. N. (author)
- Lubrano, P. (author)
- Madejski, G. M. (author)
- Manfreda, A. (author)
- Massaro, F. (author)
- Mayer, M. (author)
- Mazziotta, M. N. (author)
- McEnery, J. E. (author)
- Michelson, P. F. (author)
- Mitthumsiri, W. (author)
- Mizuno, T. (author)
- Moiseev, A. A. (author)
- Monzani, M. E. (author)
- Morselli, A. (author)
- Moskalenko, I. V. (author)
- Murgia, S. (author)
- Nemmen, R. (author)
- Nuss, E. (author)
- Ohsugi, T. (author)
- Omodei, N. (author)
- Orlando, E. (author)
- Ormes, J. F. (author)
- Paneque, D. (author)
- Panetta, J. H. (author)
- Perkins, J. S. (author)
- Pesce-Rollins, M. (author)
- Piron, F. (author)
- Pivato, G. (author)
- Porter, T. A. (author)
- Raino, S. (author)
- Rando, R. (author)
- Razzano, M. (author)
- Razzaque, S. (author)
- Reimer, A. (author)
- Reimer, O. (author)
- Reposeur, T. (author)
- Ritz, S. (author)
- Romani, R. W. (author)
- Sanchez-Conde, M. (author)
- Schaal, M. (author)
- Schulz, A. (author)
- Sgro, C. (author)
- Siskind, E. J. (author)
- Spandre, G. (author)
- Spinelli, P. (author)
- Strong, A. W. (author)
- Suson, D. J. (author)
- Takahashi, H. (author)
- Thayer, J. G. (author)
- Thayer, J. B. (author)
- Tibaldo, L. (author)
- Tinivella, M. (author)
- Torres, D. F. (author)
- Tosti, G. (author)
- Troja, E. (author)
- Uchiyama, Y. (author)
- Vianello, G. (author)
- Werner, M. (author)
- Winer, B. L. (author)
- Wood, K. S. (author)
- Wood, M. (author)
- Zaharijas, G. (author)
- show less...
- (creator_code:org_t)
- 2015
- 2015
- English.
- In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 799:1, s. 86-
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- The gamma-ray sky can be decomposed into individually detected sources, diffuse emission attributed to the interactions of Galactic cosmic rays with gas and radiation fields, and a residual all-sky emission component commonly called the isotropic diffuse gamma-ray background (IGRB). The IGRB comprises all extragalactic emissions too faint or too diffuse to be resolved in a given survey, as well as any residual Galactic foregrounds that are approximately isotropic. The first IGRB measurement with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi) used 10 months of sky-survey data and considered an energy range between 200 MeV and 100 GeV. Improvements in event selection and characterization of cosmic-ray backgrounds, better understanding of the diffuse Galactic emission (DGE), and a longer data accumulation of 50 months allow for a refinement and extension of the IGRB measurement with the LAT, now covering the energy range from 100 MeV to 820 GeV. The IGRB spectrum shows a significant high-energy cutoff feature and can be well described over nearly four decades in energy by a power law with exponential cutoff having a spectral index of 2.32 +/- 0.02 and a break energy of (279 +/- 52) GeV using our baseline DGE model. The total intensity attributed to the IGRB is (7.2 +/- 0.6) x 10(-6) cm(-2) s(-1) sr(-1) above 100 MeV, with an additional +15%/-30% systematic uncertainty due to the Galactic diffuse foregrounds.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- diffuse radiation
- gamma rays: diffuse background
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
- Ackermann, M.
- Ajello, M.
- Albert, A.
- Atwood, W. B.
- Baldini, L.
- Ballet, J.
- show more...
- Barbiellini, G.
- Bastieri, D.
- Bechtol, K.
- Bellazzini, R.
- Bissaldi, E.
- Blandford, R. D.
- Bloom, E. D.
- Bottacini, E.
- Brandt, T. J.
- Bregeon, J.
- Bruel, P.
- Buehler, R.
- Buson, S.
- Caliandro, G. A.
- Cameron, R. A.
- Caragiulo, M.
- Caraveo, P. A.
- Cavazzuti, E.
- Cecchi, C.
- Charles, E.
- Chekhtman, A.
- Chiang, J.
- Chiaro, G.
- Ciprini, S.
- Claus, R.
- Cohen-Tanugi, J.
- Conrad, Jan
- Cuoco, A.
- Cutini, S.
- D'Ammando, F.
- de Angelis, A.
- de Palma, F.
- Dermer, C. D.
- Digel, S. W.
- do Couto e Silva ...
- Drell, P. S.
- Favuzzi, C.
- Ferrara, E. C.
- Focke, W. B.
- Franckowiak, A.
- Fukazawa, Y.
- Funk, S.
- Fusco, P.
- Gargano, F.
- Gasparrini, D.
- Germani, S.
- Giglietto, N.
- Giommi, P.
- Giordano, F.
- Giroletti, M.
- Godfrey, G.
- Gomez-Vargas, G. ...
- Grenier, I. A.
- Guiriec, S.
- Gustafsson, M.
- Hadasch, D.
- Hayashi, K.
- Hays, E.
- Hewitt, J. W.
- Ippoliti, P.
- Jogler, T.
- Johannesson, G.
- Johnson, A. S.
- Johnson, W. N.
- Kamae, T.
- Kataoka, J.
- Knoedlseder, J.
- Kuss, M.
- Larsson, Stefan
- Latronico, L.
- Li, J.
- Li, L.
- Longo, F.
- Loparco, F.
- Lott, B.
- Lovellette, M. N ...
- Lubrano, P.
- Madejski, G. M.
- Manfreda, A.
- Massaro, F.
- Mayer, M.
- Mazziotta, M. N.
- McEnery, J. E.
- Michelson, P. F.
- Mitthumsiri, W.
- Mizuno, T.
- Moiseev, A. A.
- Monzani, M. E.
- Morselli, A.
- Moskalenko, I. V ...
- Murgia, S.
- Nemmen, R.
- Nuss, E.
- Ohsugi, T.
- Omodei, N.
- Orlando, E.
- Ormes, J. F.
- Paneque, D.
- Panetta, J. H.
- Perkins, J. S.
- Pesce-Rollins, M ...
- Piron, F.
- Pivato, G.
- Porter, T. A.
- Raino, S.
- Rando, R.
- Razzano, M.
- Razzaque, S.
- Reimer, A.
- Reimer, O.
- Reposeur, T.
- Ritz, S.
- Romani, R. W.
- Sanchez-Conde, M ...
- Schaal, M.
- Schulz, A.
- Sgro, C.
- Siskind, E. J.
- Spandre, G.
- Spinelli, P.
- Strong, A. W.
- Suson, D. J.
- Takahashi, H.
- Thayer, J. G.
- Thayer, J. B.
- Tibaldo, L.
- Tinivella, M.
- Torres, D. F.
- Tosti, G.
- Troja, E.
- Uchiyama, Y.
- Vianello, G.
- Werner, M.
- Winer, B. L.
- Wood, K. S.
- Wood, M.
- Zaharijas, G.
- Zimmer, Stephan
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- Stockholm University
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