Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....5.1872c&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The existence of cosmic rays in the intergalactic space is demonstrated by a comparison of the short containment times of galactic cosmic rays with the age of the oldest stars, about 107 years against 18 × 107 years. This implies, for a typical spiral galaxy, an average number of 1800 injection cycles of cosmic rays into the intergalactic space. From the presence of an extragalactic cosmic ray ux surrounding the haloes of galaxies, regardless of its intensity, follows that a significant fraction of the extragalactic ux is either absorbed or re ected by the magnetic fields and eventually amplified by interstellar interactions. Recent measurements of the magnetic fields of more than 15 spiral galaxies are available. A calculation of the fraction of extragalactic ux of antihelium and proton populations suffering absorption, re ection or amplification in spiral galaxies is presented. Relevance of these results on the antihelium search is discussed.
Codino Antonio
Plouin Francois
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