Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.361..236m&link_type=abstract
Nature (ISSN 0028-0836), vol. 361, no. 6409, p. 236-238.
Astronomy and Astrophysics
Astronomy
118
Black Holes (Astronomy), Collimation, Gamma Ray Bursts, Neutron Stars, Doppler Effect, Neutrinos, Statistical Analysis
Scientific paper
The distribution of more than 150 gamma-ray bursts detected by the BATSE experiment is isotropic on the sky but radially nonuniform. This raises the possibility that bursts are cosmological and therefore very energetic events, releasing about 10 exp 50 erg/sr on a timescale of seconds. The coalescence of two neutron stars or the accretion-induced collapse of a white dwarf can release up to 10 exp 53 erg in the form of neutrino-antineutrino pairs, so that the conversion of less than 1 percent into gamma-rays by annihilation could generate gamma-ray bursts, but in all such models an optically thick wind tends to form, preventing the gamma-rays from escaping and converting their energy into kinetic energy of the ejected material. We present here a possible solution to this difficulty. When a stellar-mass neutron star is disrupted by a black hole, it forms a thick disk which emits neutrino-antineutrino pairs. These neutrinos expel a wind from the disk, but angular momentum conservation means that a clear funnel forms along the rotation axis. Neutrino annihilation within the matter-free funnel can then create gamma-rays which escape to the distant observer.
Hernanz Margarida
Isern Jordi
Martin Xavier
Mochkovitch Robert
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