Janiuk 2007 中微子盘产生伽玛暴

主要内容:
探讨中微子盘在怎样的情况下可以产生伽玛暴。

精彩摘抄:


文章信息:
Instabilities in the time-dependent neutrino disc in Gamma-Ray Bursts

Authors: Agnieszka Janiuk, Ye-Fei Yuan, Rosalba Perna, Tiziana di Matteo

(Submitted on 11 Apr 2007)

Abstract: We investigate the properties and evolution of accretion tori formed after the coalescence of two compact objects. At these extreme densities and temperatures, the accreting torus is cooled mainly by neutrino emission produced primarily by electron and positron capture on nucleons (beta reactions). We solve for the disc structure and its time evolution by introducing a detailed treatment of the equation of state which includes photodisintegration of helium, the condition of beta-equilibrium, and neutrino opacities. We self-consistently calculate the chemical equilibrium in the gas consisting of helium, free protons, neutrons and electron-positron pairs and compute the chemical potentials of the species, as well as the electron fraction throughout the disc. We find that, for sufficiently large accretion rates (> 10 solar masses per second), the inner regions of the disk become opaque and develop a viscous and thermal instability. The identification of this instability might be relevant for GRB observations.

Comments:

23 pages, 18 figures; accepted for publication in ApJ

Subjects:

Astrophysics (astro-ph)

Cite as:

arXiv:0704.1325v1 [astro-ph]