The Origin of Present Day Cosmic Rays: Fresh SN Ejecta or Interstellar Medium Material?

Details The Origin of Present Day Cosmic Rays: Fresh SN Ejecta or Interstellar Medium Material? The Origin of Present Day Cosmic Rays: Fresh SN Ejecta or Interstellar Medium Material?

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.2805e&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #28.05; Bulletin of the American Astronomical Society, Vol. 31, p.865

Astronomy and Astrophysics

Astronomy

Scientific paper

Assuming that cosmic ray refractory material originates in dust grains, we examine the viability of cosmic ray origin models wherein the bulk of present day cosmic rays are accelerated out of fresh supernova ejecta material before it mixes with the average interstellar medium. We conclude that the fresh ejecta scenarios that have been proposed thus far have serious flaws and are unable to account for known properties of present day cosmic rays. This implies that the near linear increase in Be abundance with metallicity observed in old, halo stars cannot imply that a significant fraction of the cosmic rays seen today come from fresh supernova ejecta.

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