Evidence for a discrete-source origin for low-energy continuum Galactic gamma rays
We describe recent studies of the diffuse Galactic g-ray
continuum emission using cosmic-ray propagation models.
We show that it is difficult to reproduce both g-ray continuum
and synchrotron emission from the same population of cosmic-ray
electrons unless there is a very sharp upturn in the electron spectrum
below 100 MeV. This indicates that the dominant contributor below 10
MeV is not in fact diffuse emission, but arises from a population of point-sources.
Possible candidates will be discussed.
The diffuse emission models are also used to address the problem of the origin of the > 1 GeV excess
observed by EGRET, and the halo contribution to high-latitude g rays.
File translated from TEX by TTH, version 2.32.
On 16 Jul 1999, 09:19.