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- W3100192584 abstract "Recent three-dimensional, high-resolution simulations of neutron star coalescences are analysed to assess whether short gamma-ray bursts (GRBs) could originate from such encounters. The two most popular modes of energy extraction — namely the annihilation of ν ν¯ and magnetohydrodynamic processes — are explored in order to investigate their viability in launching GRBs. We find that ν ν¯ annihilation can provide the necessary stresses to drive a highly relativistic expansion. However, unless the outflow is beamed into less than 1 per cent of the solid angle, this mechanism may fail to explain the apparent isotropized energies implied for short GRBs at cosmological distances. We argue that the energetic, neutrino-driven wind that accompanies the merger event will have enough pressure to provide adequate collimation to the ν ν¯-annihilation-driven jet, thereby comfortably satisfying constraints on event rate and apparent luminosity. We also assess magnetic mechanisms to transform the available energy into a GRB. If the central object does not collapse immediately into a black hole, it will be convective and it is expected to act as an effective large scale dynamo, amplifying the seed magnetic fields to a few times 1017 G within a small fraction of a second. The associated spindown time-scale is 0.2 s, coinciding with the typical duration of a short GRB. The efficiencies of the various assessed magnetic processes are high enough to produce isotropized luminosities in excess of 1052 erg s−1 even without beaming." @default.
- W3100192584 created "2020-11-23" @default.
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- W3100192584 creator A5036775360 @default.
- W3100192584 date "2003-11-11" @default.
- W3100192584 modified "2023-09-27" @default.
- W3100192584 title "High-resolution calculations of merging neutron stars - III. Gamma-ray bursts" @default.
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- W3100192584 doi "https://doi.org/10.1046/j.1365-2966.2003.07032.x" @default.
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