Gamma-ray bursts from the interaction of degenerate disks with fast neutron stars (Part II)
- NIS-2, MS D436, Los Alamos Nat. Lab. Los Alamos, New Mexico 87545 (United States)
- T-6, MS B275, Los Alamos Nat. Lab., Los Alamos , New Mexico 87545 (United States)
We describe a reasonable model of a galactic halo origin of gamma-ray bursts (GRBs). The observed isotropy of GRBs requires fast {approximately}10{sup 8}cms{sup {minus}1} neutron stars (NSs), with a finite delay period {approximately}30My, before turn on and {approximately}{times}10 longer before turning off. The NSs might not be radio pulsars, despite a normal NS magnetic field, {approximately}10{sup 12} gauss because of slow rotation from tidal locking in a presupernova binary. The high velocity can be produced from a neutrino rocket effect from anisotropic accretion during the supernova event, which is expected to be aligned with the binary companion. Such a high-velocity NS will capture mass ({approximately}10{sup {minus}5}M{sub {circle_dot}}) from a near miss of the companion or from the supernova debris. This mass is {times}10 the mass required to power an initial soft gamma-ray repeater (SGR) phase for 10{sup 4}y as well as later 10{sup 5} GRBs in 3{times}10{sup 8}y, (assuming one fast NS per 100 years). Following the SGR phase, the disk cools and condenses into a quiescent solar system type disk of grains, rocks and planetoids in {approximately}30My. When the mass of one planetoid exceeds the critical scattering mass, {approximately}10{sup 22 to 23}g, some planetoids will be scattered into highly elliptic orbits and break up close to the NS. The orbits of the debris will decay forming a sequence of dense, degenerate, accretion disks, which evolve by radiation cooling and the internal friction of solidification. A disk mass of {approximately}10{sup 21 to 22}g results in a thin disk whose Alv{acute e}n radius is close to that of the NS. The velocity of the disk crossed with the strong magnetic field creates high electric fields, large enough to cause vacuum break-down and electron-positron cascades. The displacement current from producing the electric field as well as the break-down current results in the torque of accretion. (Abstract Truncated)
- OSTI ID:
- 526783
- Report Number(s):
- CONF-9510332-; ISSN 0094-243X; TRN: 97:016864
- Journal Information:
- AIP Conference Proceedings, Vol. 384, Issue 1; Conference: 3. Huntsville symposium on gamma ray bursts, Huntsville, AL (United States), 25-27 Oct 1995; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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