High-energy cosmic rays and neutrinos from semirelativistic hypernovae

Xiang Yu Wang, Soebur Razzaque, Peter Mészáros, Zi Gao Dai

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

The origin of the ultrahigh-energy (UHE) cosmic rays (CRs) from the second knee (∼6×1017eV) above in the CR spectrum is still unknown. Recently, there has been growing evidence that a peculiar type of supernovae, called hypernovae, are associated with subenergetic gamma-ray bursts, such as SN1998bw/GRB980425 and SN2003lw/GRB031203. Such hypernovae appear to have high (up to mildly relativistic) velocity ejecta, which may be linked to the subenergetic gamma-ray bursts. Assuming a continuous distribution of the kinetic energy of the hypernova ejecta as a function of its velocity Ek(Γβ)-α with α∼2, we find that (1) the external shock wave produced by the high-velocity ejecta of a hypernova can accelerate protons up to energies as high as 1019eV; (2) the cosmological hypernova rate is sufficient to account for the energy flux above the second knee; and (3) the steeper spectrum of CRs at these energies can arise in these sources. In addition, hypernovae would also give rise to a faint diffuse UHE neutrino flux, due to pγ interactions of the UHE CRs with hypernova optical-UV photons.

Original languageEnglish (US)
Article number083009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume76
Issue number8
DOIs
StatePublished - Oct 25 2007

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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