THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV

Journal article


Publication Details

Author(s): 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, Bottacini E, Brandt TJ, Bregeon J, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cuoco A, Cutini S, D'Ammando F, De Angelis A, De Palma F, Dermer CD, Digel SW, Do Couto E Silva E, Drell PS, Favuzzi C, Ferrara EC, Focke WB, 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 GA, Grenier IA, Guiriec S, Gustafsson M, Hadasch D, Hayashi K, Hays E, Hewitt JW, Ippoliti P, Jogler T, Johannesson G, Johnson AS, Johnson WN, Kamae T, Kataoka J, Knoedlseder J, Kuss M, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Manfreda A, Massaro F, Mayer M, Mazziotta MN, Mcenery JE, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nemmen R, Nuss E, Ohsugi T, Omodei N, Orlando E, Ormes JF, Paneque D, Panetta JH, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Ritz S, Romani RW, Sanchez-Conde M, Schaal M, Schulz A, Sgro C, Siskind EJ, Spandre G, Spinelli P, Strong AW, Suson DJ, Takahashi H, Thayer JG, Thayer JB, Tibaldo L, Tinivella M, Torres DF, Tosti G, Troja E, Uchiyama Y, Vianello G, Werner M, Winer BL, Wood KS, Wood M, Zaharijas G, Zimmer S
Journal: Astrophysical Journal
Publisher: American Astronomical Society
Publication year: 2015
Volume: 799
ISSN: 0004-637X
eISSN: 1538-4357


Abstract


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.



FAU Authors / FAU Editors

Funk, Stefan Prof. Dr.
Lehrstuhl für Physik


External institutions with authors

AlbaNova University Centre / Kungliga Tekniska Högskolan AlbaNova Universitetscentrum
Clemson University
Deutsches Elektronen-Synchrotron DESY
École Polytechnique - Université Paris-Saclay
George Mason University
Hiroshima University
Italian Space Agency / Agenzia Spaziale Italiana (ASI)
Japan Aerospace eXploration Agency (JAXA)
Leopold-Franzens-Universität Innsbruck / University of Innsbruck
Mahidol University / มหาวิทยาลัยมหิดล
Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics
National Academy of Sciences
National Aeronautics and Space Administration (NASA)
National Center for Scientific Research / Centre national de la recherche scientifique (CNRS)
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN)
NYCB Real-Time Computing, Inc.
Ohio State University
Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC)
Stanford University
Stockholm University / Stockholms universitet
Université Bordeaux 1, Sciences et Technologies
Université libre de Bruxelles (ULB)
University of California Irvine
University of California Santa Cruz
University of Chicago
University of Denver
University of Iceland (UI)
University of Johannesburg
University of Maryland
University of Maryland, Baltimore County
University of Montpellier / Université Montpellier
University of Padua
University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot
University of Udine / Università degli Studi di Udine
U.S. Naval Research Laboratory
Waseda University / 早稲田大学


How to cite

APA:
Ackermann, M., Ajello, M., Albert, A., Atwood, W.B., Baldini, L., Ballet, J.,... Zimmer, S. (2015). THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV. Astrophysical Journal, 799. https://dx.doi.org/10.1088/0004-637X/799/1/86

MLA:
Ackermann, M., et al. "THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV." Astrophysical Journal 799 (2015).

BibTeX: 

Last updated on 2019-23-08 at 08:32