Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-08-20
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Proceeding of the 31st International Cosmic Ray Conference, Lodz 2009, 4 pages, 2 figures
Scientific paper
The energy range encompassing the ankle of the cosmic ray energy spectrum probably marks the exhaustion of the accelerating sources in our Galaxy, as well as the end of the Galactic confinement. Furthermore, this is the region where the extragalactic flux penetrates the interstellar medium and starts, progressively, to be dominant. Although at lower energies it is likely that an "average" population of supernova remnants can be defined to account for most of the cosmic ray flux, this assumption is increasingly difficult to maintain as higher energies are considered. One possibility is that supernovas are still a main contributor along the first branch of the ankle region, but that the acceleration is now coming from well localized regions with a characteristic interstellar medium, or a sub-population of supernovas exploding in a peculiar circumstellar environment. These possibilities are analyzed in the present work using a two-dimensional diffusion model for cosmic ray propagation. Special emphasis is given to the inner 200 pc of our Galaxy and to the spiral arm structure in relation with the Sun position inside the disk.
de Donato Cinzia
Medina-Tanco Gustavo
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