Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2010 Mar 12;104(10):101101.
doi: 10.1103/PhysRevLett.104.101101. Epub 2010 Mar 8.

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

A A Abdo  1 , M Ackermann, M Ajello, W B Atwood, 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, S Buson, G A Caliandro, R A Cameron, P A Caraveo, J M Casandjian, E Cavazzuti, C Cecchi, O Celik, E Charles, A Chekhtman, C C Cheung, J Chiang, S Ciprini, R Claus, J Cohen-Tanugi, L R Cominsky, J Conrad, S Cutini, C D Dermer, A de Angelis, F de Palma, S W Digel, G Di Bernardo, E do Couto e Silva, P S Drell, A Drlica-Wagner, R Dubois, D Dumora, C Farnier, C Favuzzi, S J Fegan, W B Focke, P Fortin, M Frailis, Y Fukazawa, S Funk, P Fusco, D Gaggero, F Gargano, D Gasparrini, N Gehrels, S Germani, B Giebels, N Giglietto, P Giommi, F Giordano, T Glanzman, G Godfrey, I A Grenier, M-H Grondin, J E Grove, L Guillemot, S Guiriec, M Gustafsson, Y Hanabata, A K Harding, M Hayashida, R E Hughes, R Itoh, M S Jackson, 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, M Lemoine-Goumard, 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, J P Norris, E Nuss, T Ohsugi, 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, L S Rochester, 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, M S Shaw, E J Siskind, D A Smith, P D Smith, G Spandre, P Spinelli, J-L Starck, M S Strickman, A W Strong, D J Suson, H Tajima, H Takahashi, T 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

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

A A Abdo et al. Phys Rev Lett. .

Abstract

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.

PubMed Disclaimer

Similar articles

  • Fermi large area telescope measurements of the diffuse gamma-ray emission at intermediate galactic latitudes.
    Abdo AA, Ackermann M, Ajello M, Anderson B, Atwood WB, Axelsson M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Baughman BM, Bechtol K, Bellazzini R, Berenji B, Blandford RD, Bloom ED, Bonamente E, Borgland AW, Bregeon J, Brez A, Brigida M, Bruel P, Burnett TH, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cecchi C, Charles E, Chekhtman A, Cheung CC, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dereli H, Dermer CD, de Angelis A, de Palma F, Digel SW, Di Bernardo G, Dormody M, do Couto e Silva E, Drell PS, Dubois R, Dumora D, Edmonds Y, Farnier C, Favuzzi C, Fegan SJ, Focke WB, Frailis M, Fukazawa Y, Funk S, Fusco P, Gaggero D, Gargano F, Gehrels N, Germani S, Giebels B, Giglietto N, Giordano F, Glanzman T, Godfrey G, Grenier IA, Grondin MH, Grove JE, Guillemot L, Guiriec S, Hanabata Y, Harding AK, Hayashida M, Hays E, Hughes RE, Jóhannesson G, Johnson AS, Johnson RP, Johnson TJ, Johnson WN, Kamae T, Katagiri H, Kataoka J, Kawai N, Kerr M, Knödlseder J, Kocian ML, Kuehn F, Kuss M, Lande J, Latronico L, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Makeev A, Mazziotta MN, McConville W, McEnery JE, Meurer C, Michelson PF, Mitthumsiri W, Mizun… See abstract for full author list ➔ Abdo AA, et al. Phys Rev Lett. 2009 Dec 18;103(25):251101. doi: 10.1103/PhysRevLett.103.251101. Epub 2009 Dec 16. Phys Rev Lett. 2009. PMID: 20366246
  • Robust identification of isotropic diffuse gamma rays from galactic dark matter.
    Siegal-Gaskins JM, Pavlidou V. Siegal-Gaskins JM, et al. Phys Rev Lett. 2009 Jun 19;102(24):241301. doi: 10.1103/PhysRevLett.102.241301. Epub 2009 Jun 18. Phys Rev Lett. 2009. PMID: 19658993
  • Resolving the Extragalactic γ-Ray Background above 50 GeV with the Fermi Large Area Telescope.
    Ackermann M, Ajello M, Albert A, Atwood WB, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bregeon J, Britto RJ, Bruel P, Buehler R, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Cohen-Tanugi J, Cominsky LR, Costanza F, Cutini S, D'Ammando F, de Angelis A, de Palma F, Desiante R, Digel SW, Di Mauro M, Di Venere L, Domínguez A, Drell PS, Favuzzi C, Fegan SJ, Ferrara EC, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giommi P, Giordano F, Giroletti M, Godfrey G, Green D, Grenier IA, Guiriec S, Hays E, Horan D, Iafrate G, Jogler T, Jóhannesson G, Kuss M, La Mura G, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Magill J, Maldera S, Manfreda A, Mayer M, Mazziotta MN, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Negro M, Nuss E, Ohsugi T, Okada C, Omodei N, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Petrosian V, Piron F, Pivato G, Porter TA, Rainò S, Rando R, Razzano M, Ra… See abstract for full author list ➔ Ackermann M, et al. Phys Rev Lett. 2016 Apr 15;116(15):151105. doi: 10.1103/PhysRevLett.116.151105. Epub 2016 Apr 14. Phys Rev Lett. 2016. PMID: 27127954
  • Strong Support for the Millisecond Pulsar Origin of the Galactic Center GeV Excess.
    Bartels R, Krishnamurthy S, Weniger C. Bartels R, et al. Phys Rev Lett. 2016 Feb 5;116(5):051102. doi: 10.1103/PhysRevLett.116.051102. Epub 2016 Feb 4. Phys Rev Lett. 2016. PMID: 26894696
  • Extragalactic background light measurements and applications.
    Cooray A. Cooray A. R Soc Open Sci. 2016 Mar 9;3(3):150555. doi: 10.1098/rsos.150555. eCollection 2016 Mar. R Soc Open Sci. 2016. PMID: 27069645 Free PMC article. Review.
See all similar articles

Cited by

LinkOut - more resources