Cosmic ray neon, Wolf-Rayet stars, and the superbubble origin of galactic cosmic rays

Details Cosmic ray neon, Wolf-Rayet stars, and the superbubble origin of galactic cosmic rays Cosmic ray neon, Wolf-Rayet stars, and the superbubble origin of galactic cosmic rays

2005-08-18

arxiv.org/abs/astro-ph/0508398v1

Astrophys.J.634:351-364,2005

Astronomy and Astrophysics

Astrophysics

22 pages, 6 figures Accepted for publication by ApJ

Scientific paper

10.1086/496959

The abundances of neon isotopes in the galactic cosmic rays (GCRs) are reported using data from the Cosmic Ray Isotope Spectrometer (CRIS) aboard the Advanced Composition Explorer (ACE). We compare our ACE-CRIS data for neon and refractory isotope ratios, and data from other experiments, with recent results from two-component Wolf-Rayet (WR) models. The three largest deviations of GCR isotope ratios from solar-system ratios predicted by these models are indeed present in the GCRs. Since WR stars are evolutionary products of OB stars, and most OB stars exist in OB associations that form superbubbles, the good agreement of these data with WR models suggests that superbubbles are the likely source of at least a substantial fraction of GCRs.

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