Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293..803m&link_type=abstract
Astronomy and Astrophysics 293, 803-809 (1995)
Astronomy and Astrophysics
Astrophysics
18
Gamma Ray: Theory, Bursts, Neutron Stars, Accretion Disks
Scientific paper
We show that following the coalescence of two neutron stars two opposite relativistic beams are formed along the system axis. They are feeded in energy by νν annihilation and can reach relativistic factors {GAMMA}~10^2^-10^3^. These high {GAMMA} values are possible because (i) the central core of the merger is cooler than the surrounding disk and (ii) most of the energy is released beyond the sonic point in the beam. Results obtained for different geometries of the disk neutrinosphere are presented and compared. The interaction of the ejected matter with the interstellar medium will produce a γ-ray burst if the kinetic energy (which can exceed 10^51^erg) can be efficiently radiated by non thermal processes in shocks (Rees & Meszaros 1992). We compute the burst duration and estimate the strength of its thermal precursor as a function of {GAMMA}. Finally, we briefly discuss constraints on the model imposed by the burst statistics.
Hernanz Margarida
Isern Jordi
Loiseau Sacha
Mochkovitch Robert
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