Spectrum of the isotropic diffuse gamma-ray emission derived from first-year Fermi Large Area Telescope data

Spectrum of the isotropic diffuse gamma-ray emission derived from first-year Fermi Large Area Telescope data

We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called "extragalactic" diffuse gamma-ray emission (EGB). This component of the diffuse gamma-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse con...

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Veröffentlicht in:Physical review letters 2010-03, Vol.104 (10), p.101101-101101, Article 101101
Hauptverfasser: Abdo, A A, Ackermann, M, Ajello, M, Atwood, W B, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Baughman, B M, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, R D, Bloom, E D, Bonamente, E, Borgland, A W, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Burnett, T H, Buson, S, Caliandro, G A, Cameron, R A, Caraveo, P A, Casandjian, J M, Cavazzuti, E, Cecchi, C, Celik, O, Charles, E, Chekhtman, A, Cheung, C C, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Cominsky, L R, Conrad, J, Cutini, S, Dermer, C D, de Angelis, A, de Palma, F, Digel, S W, Di Bernardo, G, do Couto e Silva, E, Drell, P S, Drlica-Wagner, A, Dubois, R, Dumora, D, Farnier, C, Favuzzi, C, Fegan, S J, Focke, W B, Fortin, P, Frailis, M, Fukazawa, Y, Funk, S, Fusco, P, Gaggero, D, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giebels, B, Giglietto, N, Giommi, P, Giordano, F, Glanzman, T, Godfrey, G, Grenier, I A, Grondin, M-H, Grove, J E, Guillemot, L, Guiriec, S, Gustafsson, M, Hanabata, Y, Harding, A K, Hayashida, M, Hughes, R E, Itoh, R, Jackson, M S, Jóhannesson, G, Johnson, A S, Johnson, R P, Johnson, T J, Johnson, W N, Kamae, T, Katagiri, H, Kataoka, J, Kawai, N, Kerr, M, Knödlseder, J, Kocian, M L, Kuehn, F, Kuss, M, Lande, J, Latronico, L, Lemoine-Goumard, M, Longo, F, Loparco, F
Format: Artikel
Sprache:eng
Schlagworte:
ASTRONOMY AND ASTROPHYSICS
Astrophysics
Cosmology and Extra-Galactic Astrophysics
egret data
Fysik
inverse compton-scattering
NATURAL SCIENCES
NATURVETENSKAP
Physics
solar
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Zusammenfassung:We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called "extragalactic" diffuse gamma-ray emission (EGB). This component of the diffuse gamma-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse contributions discussed in the literature. The derivation of the EGB is based on detailed modeling of the bright foreground diffuse Galactic gamma-ray emission, the detected LAT sources, and the solar gamma-ray emission. We find the spectrum of the EGB is consistent with a power law with a differential spectral index gamma = 2.41 +/- 0.05 and intensity I(>100 MeV) = (1.03 +/- 0.17) x 10(-5) cm(-2) s(-1) sr(-1), where the error is systematics dominated. Our EGB spectrum is featureless, less intense, and softer than that derived from EGRET data.
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/physrevlett.104.101101