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Astrophysics > High Energy Astrophysical Phenomena

arXiv:1608.08183 (astro-ph)
[Submitted on 29 Aug 2016]

Title:Galactic Cosmic Ray Origins and OB Associations: Evidence from SuperTIGER Observations of Elements $_{26}$Fe through $_{40}$Zr

Authors:R. P. Murphy, M. Sasaki, W. R. Binns, T. J. Brandt, T. Hams, M. H. Israel, A. W. Labrador, J. T. Link, R. A. Mewaldt, J. W. Mitchell, B. F. Rauch, K. Sakai, E. C. Stone, C. J. Waddington, N. E. Walsh, J. E. Ward, M. E. Wiedenbeck
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Abstract:We report abundances of elements from $_{26}$Fe to $_{40}$Zr in the cosmic radiation measured by the SuperTIGER (Trans-Iron Galactic Element Recorder) instrument during 55 days of exposure on a long-duration balloon flight over Antarctica. These observations resolve elemental abundances in this charge range with single-element resolution and good statistics.
These results support a model of cosmic-ray origin in which the source material consists of a mixture of 19$^{+11}_{-6}$\% material from massive stars and $\sim$81\% normal interstellar medium (ISM) material with solar system abundances. The results also show a preferential acceleration of refractory elements (found in interstellar dust grains) by a factor of $\sim$4 over volatile elements (found in interstellar gas) ordered by atomic mass (A). Both the refractory and volatile elements show a mass-dependent enhancement with similar slopes.
Comments: 9 pages, 12 figures, 2 tables, accepted by ApJ
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:1608.08183 [astro-ph.HE]
  (or arXiv:1608.08183v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.1608.08183
Journal reference: ApJ 831 (2016) 148
Related DOI: https://doi.org/10.3847/0004-637X/831/2/148

Submission history

From: Ryan Murphy [view email]
[v1] Mon, 29 Aug 2016 19:10:20 UTC (1,323 KB)
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