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 (≥0.1–1M 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.
Long duration gamma-ray bursts: hydrodynamic instabilities in collapsar disks / Taylor, P. A.; Miller, John; Podsiadlowski, Ph. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 410:4(2011), pp. 2385-2413. [10.1111/j.1365-2966.2010.17618.x]
Long duration gamma-ray bursts: hydrodynamic instabilities in collapsar disks
Miller, John;
2011-01-01
Abstract
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 (≥0.1–1M 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.File | Dimensione | Formato | |
---|---|---|---|
Miller-mnras0410-2385.pdf
accesso aperto
Tipologia:
Versione Editoriale (PDF)
Licenza:
Non specificato
Dimensione
7.83 MB
Formato
Adobe PDF
|
7.83 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.