Jet Luminosity from Neutrino-Dominated Accretion Flows in GRBs
Abstract
A hyperaccretion disk around a stellar-mass black hole is a plausible model for the central engine that powers gamma-ray bursts (GRBs). We estimate the luminosity of a jet driven by magnetohydrodynamic processes such as the Blandford-Znajek (BZ) mechanism as a function of mass accretion rate, the black hole mass, and other accretion parameters. We show that the jet is most efficient when the accretion flow is cooled via optically-thin neutrino emission, and that its luminosity is much larger than the energy deposition rate through neutrino annihilation provided that the black hole is spinning rapidly enough. Also, we find a significant jump in the jet luminosity at the transition mass accretion rate between the advection dominated accretion flow (ADAF) regime and the neutrino-dominated accretion flow (NDAF) regime. This may cause the large variability observed in the prompt emission of GRBs.
Keywords
Cite
@article{arxiv.1308.3236,
title = {Jet Luminosity from Neutrino-Dominated Accretion Flows in GRBs},
author = {Norita Kawanaka},
journal= {arXiv preprint arXiv:1308.3236},
year = {2013}
}
Comments
6 pages, 2 figures, 7th Huntsville Gamma-Ray Burst Symposium, GRB 2013: paper 11 in eConf Proceedings C1304143