Puzzles of Galactic continuum gamma rays
Abstract
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.
Cite
@article{arxiv.astro-ph/9811221,
title = {Puzzles of Galactic continuum gamma rays},
author = {I. V. Moskalenko and A. W. Strong},
journal= {arXiv preprint arXiv:astro-ph/9811221},
year = {2007}
}
Comments
4 pages including 9 figures (2 in colors), latex2e, uses epsfig.sty. A paper presented at the 3rd INTEGRAL Workshop "The Extreme Universe" (14-18 Sep. 1998, Taormina, Italy), #36, in press