Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-ray Burst Jets

Details Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-ray Burst Jets Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-ray Burst Jets

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aipc.1367..241s&link_type=abstract

INTERNATIONAL SYMPOSIUM ON THE RECENT PROGRESS OF ULTRA-HIGH ENERGY COSMIC RAY OBSERVATION. AIP Conference Proceedings, Volume

Computer Science

Jets, Supernovae, Acceleration, Intergalactic Magnetic Fields, Jets And Bursts, Galactic Winds And Fountains, Supernovae, Particle Acceleration, Electric And Magnetic Fields

Scientific paper

Recent results from the Pierre Auger Observatory (PAO) suggest that ultra-high energy cosmic rays (UHECRs) involve heavy or intermediate mass nuclei. This indicates that a considerable fraction of heavy nuclei must exist in the accelerating sites. Here, we focus on relativistic jets in gamma-ray bursts associated with core-collapse supernovae, which could contain large amount of metal. We investegate the dependence of nuclear composition on the outflow parameters. We show that when ratio of thermal to total energy density at initial radius of the outflow is high, heavy nuclei are dissociated to light particles such as α-particles during the expansion, even if the outflow initially consists of heavy and intermediate nuclei. This result demonstrates that nuclear composition of the outflow in standard fireball model is dominated by light particles after the acceleration. However, we suggest that if the jets are accelerated by magnetic field, fraction of thermal energy in the jets is not necessarily high and metal nuclei could survive in the jets.

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