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

abdo A. A.
•
Ackermann M.
•
Ajello M.
altro
Ziegler M.
2010
  • journal article

Periodico
PHYSICAL REVIEW LETTERS
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 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.
DOI
10.1103/PhysRevLett.104.101101
WOS
WOS:000275543500007
Archivio
http://hdl.handle.net/11368/2938461
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-77749298248
Diritti
metadata only access
Web of Science© citazioni
438
Data di acquisizione
Mar 14, 2024
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