The Source of Cosmic Rays: 2. Superbubble Composition

Details The Source of Cosmic Rays: 2. Superbubble Composition The Source of Cosmic Rays: 2. Superbubble Composition

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999icrc....4..144h&link_type=abstract

Proceedings of the 26th International Cosmic Ray Conference. August 17-25, 1999. Salt Lake City, Utah, USA. Under the auspices o

Physics

Scientific paper

We show that the bulk of the Galactic supernovae, their expanding remnants, together with their metal-rich grain and gas ejecta, and their cosmic ray accelerating shocks, are all confined within the interiors of hot, low-density superbubbles, generated by the multiple, correlated supernova explosions of massive stars formed from giant OB associations. These bubbles provide a cosmic ray injection source of essentially constant metallicity throughout the age of the Galaxy, as required by the observed galactic Be/Fe evolution. The acceleration of cosmic rays in these bubbles by the shocks of multiple supernovae occurring every few times 105 yr is also consistent with recent ACE observations of 59 Ni.

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