Feb 13 – 16, 2012
Europe/Zurich timezone

Extragalactic and galactic sources: new evidence, new challenges, new opportunities

Feb 15, 2012, 3:00 PM
503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber


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Alexander Kusenko (UCLA)


First, I will present new evidence, from gamma-ray observations of blazars, that cosmic rays are, indeed, accelerated in AGNs. Second, I will discuss the plausibility of a substantial contribution of transient galactic sources, such as past GRBs and hypernovae, to the observed flux of cosmic-ray nuclei. The likely contamination of UHECR data by the nuclei from past galactic stellar explosions creates new challenges for cosmic-ray astronomy. At the same time, it creates new opportunities for reconstructing galactic magnetic field and for "astro-archaeology". Finally, I will discuss some observational signatures of astrophysical nuclear accelerators.

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