Galactic Cosmic Rays from Supernova Remnants (I) - a Cosmic Ray Composition controlled by Volatility and Mass-to-Charge Ratio

摘要

This is the first of a series of papers analysing the Galactic Cosmic Raycomposition and origin. We show that the Galactic Cosmic Ray source (GCRS)composition is best described in terms of (i) a general enhancement of therefractory elements relative to the volatile ones, and (ii) among the volatileelements, an enhancement of the heavier elements relative to the lighter ones;this mass dependence most likely reflects a mass-to-charge (A/Q) dependence ofthe acceleration efficiency; among the refractory elements, there is NO suchenhancement of heavier species, or only a much weaker one. We regard ascoincidental the similarity between the GCRS composition and that of the solarcorona, which is biased according to first ionization potential. In a companionpaper, this GCRS composition is interpreted in terms of an acceleration bysupernova shock waves of interstellar and/or circumstellar (eg Ne22 richWolf-Rayet wind) gas-phase and especially dust material.