Features of Neutrino Signals from Collapsars

概要

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In this study, we investigate the luminosity and energy spectrum of neutrinos from a collapsar, which is one of the most probable candidates for Gamma-Ray Bursts. We also estimate the event number from a burst, as well as the detection rate. We show that the total energy of neutrinos depends strongly on many environmental physical parameters, such as the total accreting mass and the mass accretion rate. This is in striking contrast to the case of Supernova. We estimate that the total event number R measured by TITAND will be R 〜 1 when the source is located 30 Mpc away from the earth. The detection rate could be approximately 10 events per year as measured by TITAND. Since the total event number is much larger than that of a normal collapse-driven supernova, our results suggest that we will detect more neutrinos from a collapsar in the next generation of neutrino detectors than expected for a normal collapse-driven supernova, and, at the same time, we will observe the remnant of a collapsar naturally with optical telescopes as is the case for supernova. Such results would provide strong evidence for another mechanism of the central engine that is quite different from that of normal collapse-driven supernovae.
理論物理学刊行会の論文
2002-11-25