Status | Confirmed |
Seminar Series | APC-COLLOQUIUM |
Subjects | astro-ph |
Date | Friday 7 December 2018 |
Time | 11:00 |
Institute | APC |
Seminar Room | TBA |
Speaker's Last Name | Kachelriess |
Speaker's First Name | Michael |
Speaker's Email Address | |
Speaker's Institution | Trondheim, Norway |
Title | A Fresh Look at Galactic Cosmic Rays |
Abstract | The increased precision of new cosmic ray (CR) experiments has revealed several observational anomalies, i.e. deviations from the ``naive'' expectations in the diffusion picture for CR propagation. After reviewing a more theoretical challenge for the simplest diffusion picture, I argue that CRs diffuse strongly anisotropic. As a result, the number of CRs sources contributing to the locally observed flux is strongly suppressed, and few local CR source may dominate the CR flux. In particular, I show that the 2-3 Myr old source required to explain the Fe60 sediments found in Earth's ocean crust can also explain naturally the "positron excess" as well as the observed breaks at 200 GV in the CR primary spectra. At higher energies, Vela may be responsible for the CR knee and the CR flux up to the transition to extragalactic CRs. |
arXiv Preprint Number | |
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