13-16 February 2012
CERN
Europe/Zurich timezone

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

15 Feb 2012, 15:00
20m
503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber

CERN

162
Show room on map

Speaker

Alexander Kusenko (UCLA)

Description

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.

Primary author

Presentation Materials