Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-17
J.Phys. G32 (2006) 1035-1043
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures, 1 table, accepted for publication in J.Phys.G: Nucl.Part.Phys
Scientific paper
10.1088/0954-3899/32/7/012
The EGRET results for gamma-ray intensities in and near the Galactic Plane have been analysed in some detail. Attention has been concentrated on energies above 1 GeV and the individual intensities in a $4^\circ$ longitude bin have been determined and compared with the large scale mean found from a nine-degree polynomial fit. Comparison has been made of the observed standard deviation for the ratio of these intensities with that expected from variants of our model. The basic model adopts cosmic ray origin from supernova remnants, the particles then diffusing through the Galaxy with our usual 'anomalous diffusion'. The variants involve the clustering of SN, a frequency distribution for supernova explosion energies, and 'normal', rather than 'anomalous' diffusion. It is found that for supernovae of unique energy, and our usual anomalous diffusion, clustering is necessary, particularly in the Inner Galaxy. An alternative, and preferred, situation is to adopt the model with a frequency distribution of supernova energies. The results for the Outer Galaxy are such that no clustering is required.
Erlykin Anatoly D.
Wolfendale Arnold W.
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