Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
Jul, 2008
17 pages
Published in:
- JCAP 10 (2008) 018,
- JCAP 04 (2016) E01 (erratum)
e-Print:
- 0807.4730 [astro-ph]
DOI:
View in:
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Abstract: (arXiv)
We model the transport of cosmic ray nuclei in the Galaxy by means of a new numerical code. Differently from previous numerical models we account for a generic spatial distribution of the diffusion coefficient. We found that in the case of radially uniform diffusion, the main secondary/primary ratios (B/C, N/O and sub-Fe/Fe) and the modulated antiproton spectrum match consistently the available observations. Convection and re-acceleration do not seem to be required in the energy range we consider: GeV/nucleon. We generalize these results accounting for radial dependence of the diffusion coefficient, which is assumed to trace that of supernova remnants. While this does not affect the prediction of secondary/primary ratios, the simulated longitude profile of the diffuse -ray emission is significantly different from the uniform case and may agree with EGRET measurements without invoking {\it ad hoc} assumptions on the galactic gas density distribution.- anti-p: cosmic radiation
- nucleus: cosmic radiation
- diffusion: model
- space dependence
- gamma ray: cosmic radiation
- galaxy
- interpretation of experiments
References(64)
Figures(11)