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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Long-duration gamma-ray bursts: Hydrodynamic instabilities in collapsar discs
Monthly Notices of the Royal Astronomical Society, Volume 410, No. 4, Year 2011
Notification
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Description
We present 3D numerical simulations of the early evolution of long-duration gamma-ray bursts in the collapsar scenario. Starting from the core collapse of a realistic progenitor model, we follow the formation and evolution of a central black hole and centrifugally balanced disc. The dense, hot accretion disc produces freely escaping neutrinos and is hydrodynamically unstable to clumping and to forming non-axisymmetric (m = 1, 2) modes. We show that these spiral structures, which form on dynamical time-scales, can efficiently transfer angular momentum outwards and can drive the high required accretion rates (≥0.1-1 MȮ s-1) for producing a jet. We utilize the smoothed particle hydrodynamics code, gadget-2, modified to implement relevant microphysics, such as cooling by neutrinos, a plausible treatment approximating the central object and relativistic effects. Finally, we discuss implications of this scenario as a source of energy to produce relativistically beamed γ-ray jets. © 2010 The Authors. Journal compilation © 2010 RAS.
Authors & Co-Authors
Taylor, Paul A.
United Kingdom, Oxford
University of Oxford
South Africa, Muizenberg
African Institute for Mathematical Sciences
Miller, John C.
United Kingdom, Oxford
University of Oxford
Italy, Trieste
Istituto Nazionale Di Fisica Nucleare, Sezione Di Trieste
Podsiadlowski, Philiṕp
United Kingdom, Oxford
University of Oxford
Statistics
Citations: 23
Authors: 3
Affiliations: 3
Identifiers
Doi:
10.1111/j.1365-2966.2010.17618.x
ISSN:
00358711
e-ISSN:
13652966