Puzzles of Galactic continuum gamma rays

Details Puzzles of Galactic continuum gamma rays Puzzles of Galactic continuum gamma rays

1998-11-13

arxiv.org/abs/astro-ph/9811221v2

Astrophys.Lett.Commun. 38 (1999) 445-448

Astronomy and Astrophysics

Astrophysics

4 pages including 9 figures (2 in colors), latex2e, uses epsfig.sty. A paper presented at the 3rd INTEGRAL Workshop "The Extre

Scientific paper

Inverse Compton scattering appears to play a more important role in the diffuse Galactic continuum emission than previously thought, from MeV to GeV energies. We compare models having a large inverse Compton component with EGRET data, and find good agreement in the longitude and latitude distributions at low and high energies. We test an alternative explanation for the >1 GeV gamma-ray excess, the hard nucleon spectrum, using secondary antiprotons and positrons. At lower energies to fit the COMPTEL and OSSE data as diffuse emission requires either a steep upturn in the electron spectrum below 200 MeV or a population of discrete sources.

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