Horiuchi 2007 Neutrinos from reverse shock

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arXiv:0711.2580 [ps, pdf, other]

Title: High-energy neutrinos from reverse shocks in gamma-ray burst progenitors

Authors: Shunsaku Horiuchi (Tokyo University), Shin'ichiro Ando (Caltech)

Comments: 11 pages, 7 figures, 2 tables, submitted to PRD

Subjects: Astrophysics (astro-ph)

Highly relativistic jets are a key element of current gamma-ray burst models, where the jet bulk kinetic energy is converted to radiation energy at optically thin shocks. High-energy neutrinos are expected from photomeson interactions of protons accelerated in the same shocks. Here we revisit the early evolution of a relativistic jet, while the jet is still inside the star. We study propagation of mildly relativistic and ultrarelativistic jets through a type Ib progenitor, and follow reverse shocks as the jets cross the star. We show that protons can be accelerated to ~10^4 GeV at reverse shocks, and efficiently produce mesons, and the mesons experience significant cooling, suppressing subsequent neutrino emission on decay. We show, however, that the neutrino yield from the reverse shock is still reasonably large, especially for low-luminosity and long-duration bursts, where meson cooling is less severe.
From a choked burst with isotropic equivalent energies of 10^{53}-10^{54} erg at 10 Mpc, we expect ~2-25 neutrino events at IceCube. We discuss implications of our results in the context of neutrinos from choked jets, which are completely shock heated and do not break out of the star.