Neutrino Pair Annihilation in the Gravitation of Gamma Ray Burst Sources

Details Neutrino Pair Annihilation in the Gravitation of Gamma Ray Burst Sources Neutrino Pair Annihilation in the Gravitation of Gamma Ray Burst Sources

2000-02-09

arxiv.org/abs/astro-ph/0002196v1

Astronomy and Astrophysics

Astrophysics

18 pages, 6 figures, aasms4.sty. To appear in ApJ Part 1, March 10

Scientific paper

10.1086/308513

We study semianalytically the gravitational effects on neutrino pair annihilation near the neutrinosphere and around the thin accretion disk. For the disk case, we assume that the accretion disk is isothermal and that the gravitational field is dominated by the Schwarzschild black hole. General relativistic effects are studied only near the rotation axis. The energy deposition rate is enhanced by the effect of orbital bending toward the center. However, the effects of the redshift and gravitational trapping of the deposited energy reduce the effective energy of the gamma ray bursts' source. Although each effect is substantial, the effects partly cancel one another. As a result, the gravitational effects do not substantially change the energy deposition rate for either the spherical symmetric case or the disk case.

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