Evolution of cosmic rays in the early galaxy

Details Evolution of cosmic rays in the early galaxy Evolution of cosmic rays in the early galaxy

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407l..73m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 407, no. 2, p. L73-L76.

Astronomy and Astrophysics

Astrophysics

16

Cosmic Rays, Galactic Evolution, Galactic Halos, Nuclear Reactions, Spallation, Abundance, Interstellar Matter, Metallicity

Scientific paper

We calculate the variation of the cosmic-ray spectra at early Galactic epochs arising from dynamical evolution of the halo. In particular, we highlight the maximum effect such modified spectra can have on light isotope production in the early Galaxy, assuming a widely adopted spallation model. We find that spectra evolution alone can only maintain the linear Be vs Z relationship, observed at low Z, over the limited metallicity range Z(i)/4 - Z(i), where Zi marks the onset of linearity. At the very least, this indicates that nonlinearity in the Be abundance should be apparent at (Fe/H) is less than about -3, providing an observational test within the grasp of current techniques.

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