Erlangen 2018 – scientific programme
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P: Fachverband Plasmaphysik
P 3: Plasma Wall Interactions I / Astrophysical Plasmas
P 3.8: Talk
Monday, March 5, 2018, 15:45–16:00, A 0.112
Acceleration of Cosmic Rays in Supernova Shocks: mass to charge selectivity — •Adrian Hanusch1, Tatyana Liseykina1, and Mikhail Malkov2 — 1Universität Rostock - Institut für Physik — 2University of California San Diego
The recent precise measurements of galactic cosmic rays (CR) by PAMELA [1] and AMS-02 [2] may shed light on the long standing problem of CR origin. While the CR particles are believed to be accelerated in supernova remnant (SNR) shocks via diffusive shock acceleration (DSA), it is still not understood how different CR elements are extracted from the supernova environments and injected into the DSA. The similarity of He/p, C/p, and O/p rigidity spectra demonstrated by AMS-02 has provided new evidence that injection is a mass-to-charge dependent process.
We perform hybrid simulations of collisionless shocks and study the joint injection of different ion species with A/Z up to 16. We analyze the A/Z-dependence of the injection efficiency, and by convolving it with the time evolution of the SNR reproduce the measured p/He ratio as a function of particle rigidity.
[1] O. Adriani et al., Science, 332, 69, 2011.
[2] M. Aguilar et al., Phys. Rev. Lett., 115(21):211101, 2015.