The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data

Abstract

We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called "extra-galactic" 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 modelling of the bright foreground diffuse Galactic gamma-ray emission (DGE), the detected LAT sources and the solar gamma-ray emission. We find the spectrum of the EGB is consistent with a power law with differential spectral index g = 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. Our EGB spectrum is featureless, less intense, and softer than that derived from EGRET data.

4 figures, 1 table, supplementary material, accepted by Physical Review Letters

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• A geomagnetic filter for the Fermi-LAT background
• R-parity violation in SU(5)
• Ultra-high energy cosmic rays and the extragalactic gamma ray flux
• Retrospective of Research with Reinhard Schlickeiser
• New limit on high Galactic latitude PeV gamma-ray flux from Tibet AS-gamma data
• Common origin of the diffuse high energy backgrounds of gamma rays, neutrinos and cosmic ray positrons?
• Reconstructing Dark Matter Properties via Gamma-Rays with Fermi-LAT
• Neutralino dark matter with a Light Higgs
• Constraining the cosmic ray propagation halo thickness using Fermi-LAT observations of high-latitude clouds