TY - JOUR
T1 - Jet formation in GRBs
T2 - A semi-analytic model of MHD flow in Kerr geometry with realistic plasma injection
AU - Globus, Noemie
AU - Levinson, Amir
N1 - Publisher Copyright:
© 2014. The American Astronomical Society. All rights reserved.
PY - 2014/11/20
Y1 - 2014/11/20
N2 - We construct a semi-analytic model for magnetohydrodynamic (MHD) flows in Kerr geometry that incorporates energy loading via neutrino annihilation on magnetic field lines threading the horizon. We compute the structure of the double-flow established in the magnetisphere for a wide range of energy injection rates and identify the different operation regimes. At low injection rates, the outflow is powered by the spinning black hole via the Blandford-Znajek mechanism, whereas at high injection rates, it is driven by the pressure of the plasma deposited on magnetic field lines. In the intermediate regime, both processes contribute to the outflow formation. The parameter that quantifies the load is the ratio of the net power injected below the stagnation radius and the maximum power that can be extracted magnetically from the black hole.
AB - We construct a semi-analytic model for magnetohydrodynamic (MHD) flows in Kerr geometry that incorporates energy loading via neutrino annihilation on magnetic field lines threading the horizon. We compute the structure of the double-flow established in the magnetisphere for a wide range of energy injection rates and identify the different operation regimes. At low injection rates, the outflow is powered by the spinning black hole via the Blandford-Znajek mechanism, whereas at high injection rates, it is driven by the pressure of the plasma deposited on magnetic field lines. In the intermediate regime, both processes contribute to the outflow formation. The parameter that quantifies the load is the ratio of the net power injected below the stagnation radius and the maximum power that can be extracted magnetically from the black hole.
KW - black hole physics - gamma-ray burst
KW - general - magnetohydrodynamics (MHD) - neutrinos - relativistic processes
UR - http://www.scopus.com/inward/record.url?scp=84910026391&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/796/1/26
DO - 10.1088/0004-637X/796/1/26
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AN - SCOPUS:84910026391
SN - 0004-637X
VL - 796
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 26
ER -