Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.410.2385t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 410, Issue 4, pp. 2385-2413.
Physics
5
Black Hole Physics, Hydrodynamics, Instabilities, Neutrinos
Scientific paper
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 M&sun; 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.
Miller Christopher J.
Podsiadlowski Ph
Taylor Patrick Alan
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