Chakraborti 2010 用SN 2009bb解释超高能宇宙射线

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Title:		Ultra High Energy Cosmic Ray Acceleration in Engine-driven Relativistic Supernovae
Authors:		Chakraborti, Sayan; Ray, Alak; Soderberg, Alicia; Loeb, Abraham; Chandra, Poonam
Publication:		eprint arXiv:1012.0850
Publication Date:		12/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		23 pages, 1 figure, version submitted to Nature Communications, embargoed from discussion in the press; Nature Communications (2011), 2, 175; doi:10.1038/ncomms1178
Bibliographic Code:		2010arXiv1012.0850C

Abstract

The origin of the highest energy cosmic rays remains an enigma. They offer a window to new physics, including tests of physical laws relevant to their propagation and interactions, at energies unattainable by terrestrial accelerators. They must be accelerated locally, as otherwise background radiations would severely suppress the flux of protons and nuclei, at energies above the Greisen-Zatsepin-Kuzmin (GZK) limit. Nearby Gamma Ray Bursts (GRBs), Hypernovae, Active Galactic Nuclei (AGNs) and their flares, have all been suggested and debated as possible sources. A local sub-population of type Ibc supernovae (SNe) with mildly relativistic outflows have been detected as sub-energetic GRBs or X-Ray Flashes (XRFs) and recently as radio afterglows without detected GRB counterparts. We measure the size-magnetic field evolution, baryon loading and energetics, using the observed radio spectra of SN 2009bb. We place such engine-driven SNe above the Hillas line and establish that they can readily explain the post-GZK UHECRs.

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