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Title: Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data

Abstract

Here, we report on the first Fermi Large Area Telescope (LAT) measurements of the so-called “extragalactic” diffuse γ -ray emission (EGB). This component of the diffuse γ -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 γ -ray emission, the detected LAT sources, and the solar γ -ray emission. We also find the spectrum of the EGB is consistent with a power law with a differential spectral index γ = 2.41 ± 0.05 and intensity I ( > 100 MeV ) = ( 1.03 ± 0.17 ) × 10 - 5 cm -2 s - 1 sr - 1 , where the error is systematics dominated. The EGB spectrum, presented here, is featureless, less intense, and softer than that derived from EGRET data.

Authors:
 [1]
  1. Naval Research Lab. (NRL), Washington, DC (United States); National Academy of Sciences, Washington, DC (United States); et al.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Fermi LAT Collaboration
OSTI Identifier:
1357577
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Abdo, A. A. Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data. United States: N. p., 2010. Web. doi:10.1103/PhysRevLett.104.101101.
Abdo, A. A. Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data. United States. doi:10.1103/PhysRevLett.104.101101.
Abdo, A. A. Mon . "Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data". United States. doi:10.1103/PhysRevLett.104.101101. https://www.osti.gov/servlets/purl/1357577.
@article{osti_1357577,
title = {Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data},
author = {Abdo, A. A.},
abstractNote = {Here, we report on the first Fermi Large Area Telescope (LAT) measurements of the so-called “extragalactic” diffuse γ -ray emission (EGB). This component of the diffuse γ -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 γ -ray emission, the detected LAT sources, and the solar γ -ray emission. We also find the spectrum of the EGB is consistent with a power law with a differential spectral index γ = 2.41 ± 0.05 and intensity I ( > 100 MeV ) = ( 1.03 ± 0.17 ) × 10 - 5 cm -2 s - 1 sr - 1 , where the error is systematics dominated. The EGB spectrum, presented here, is featureless, less intense, and softer than that derived from EGRET data.},
doi = {10.1103/PhysRevLett.104.101101},
journal = {Physical Review Letters},
number = 10,
volume = 104,
place = {United States},
year = {2010},
month = {3}
}

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    Current and future constraints on dark matter from prompt and inverse-Compton photon emission in the isotropic diffuse gamma-ray background
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    The isotropic radio background and annihilating dark matter
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    Dark matter evidence, particle physics candidates and detection methods
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    Cosmic γ-ray background from structure formation in the intergalactic medium
    journal, May 2000


    Gamma-ray emission from the solar halo and disk: a study with EGRET data
    journal, January 2008


    The Extragalactic γ Ray Background
    conference, January 2007

    • Dermer, Charles D.
    • THE FIRST GLAST SYMPOSIUM, AIP Conference Proceedings
    • DOI: 10.1063/1.2757282

    A method to analyze the diffuse gamma-ray emission with the Fermi Large Area Telescope
    conference, January 2008

    • Ackermann, Markus; Jóhannesson, Guelaugur; Digel, Seth
    • HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy, AIP Conference Proceedings
    • DOI: 10.1063/1.3076791

    Diffuse gamma radiation
    journal, June 1978

    • Fichtel, C. E.; Simpson, G. A.; Thompson, D. J.
    • The Astrophysical Journal, Vol. 222
    • DOI: 10.1086/156202

    EGRET Observations of the Extragalactic Gamma‐Ray Emission
    journal, February 1998

    • Sreekumar, P.; Bertsch, D. L.; Dingus, B. L.
    • The Astrophysical Journal, Vol. 494, Issue 2
    • DOI: 10.1086/305222

    Anisotropic Inverse Compton Scattering in the Galaxy
    journal, January 2000

    • Moskalenko, Igor V.; Strong, Andrew W.
    • The Astrophysical Journal, Vol. 528, Issue 1
    • DOI: 10.1086/308138

    A New Determination of the Extragalactic Diffuse Gamma‐Ray Background from EGRET Data
    journal, October 2004

    • Strong, Andrew W.; Moskalenko, Igor V.; Reimer, Olaf
    • The Astrophysical Journal, Vol. 613, Issue 2
    • DOI: 10.1086/423196

    HEALPix: A Framework for High‐Resolution Discretization and Fast Analysis of Data Distributed on the Sphere
    journal, April 2005

    • Gorski, K. M.; Hivon, E.; Banday, A. J.
    • The Astrophysical Journal, Vol. 622, Issue 2
    • DOI: 10.1086/427976

    Parameterization of \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr}{\cyr} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} \landscape $\gamma ,\, e^{\pm }$ \end{document} , and Neutrino Spectra Produced by p‐p Interaction in Astronomical Environments
    journal, August 2006

    • Kamae, Tuneyoshi; Karlsson, Niklas; Mizuno, Tsunefumi
    • The Astrophysical Journal, Vol. 647, Issue 1
    • DOI: 10.1086/505189

    Inverse Compton Scattering on Solar Photons, Heliospheric Modulation, and Neutrino Astrophysics
    journal, November 2006

    • Moskalenko, Igor V.; Porter, Troy A.; Digel, Seth W.
    • The Astrophysical Journal, Vol. 652, Issue 1
    • DOI: 10.1086/509916

    Inverse Compton Origin of the Hard X‐Ray and Soft Gamma‐Ray Emission from the Galactic Ridge
    journal, July 2008

    • Porter, Troy A.; Moskalenko, Igor V.; Strong, Andrew W.
    • The Astrophysical Journal, Vol. 682, Issue 1
    • DOI: 10.1086/589615

    The case for a low extragalactic gamma-ray background
    journal, April 2004


    Ultrahigh energy neutrinos from population III stars: Concept and constraints
    journal, June 2012


    Unveiling Extensive Clouds of Dark Gas in the Solar Neighborhood
    journal, February 2005


    Multi-component dark matter in the light of new AMS-02 data
    journal, October 2015


    Dark matter evidence, particle physics candidates and detection methods
    journal, August 2012


    The denoised, deconvolved, and decomposed Fermi γ -ray sky : An application of the D
    journal, September 2015


    Exploring SUSY light Higgs boson scenarios via dark matter experiments
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    • Das, Debottam; Goudelis, Andreas; Mambrini, Yann
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    Current and future constraints on dark matter from prompt and inverse-Compton photon emission in the isotropic diffuse gamma-ray background
    journal, February 2012


    Ultrahigh energy neutrinos from population III stars: Concept and constraints
    journal, June 2012


    The isotropic radio background and annihilating dark matter
    journal, November 2012


    Multi-component dark matter in the light of new AMS-02 data
    journal, October 2015