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Prog. Theor. Phys. Vol. 127 No. 3 (2012) pp. 535-559

[ Full Text PDF : FREE ACCESS (2091K) ]

Radiation Magnetohydrodynamics for Black Hole-Torus System in Full General Relativity: A Step toward Physical Simulation

Masaru Shibata and Yuichiro Sekiguchi

Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan

(Received September 21, 2011; Revised January 16, 2012)

Abstract:

A radiation-magnetohydrodynamic simulation for the black hole-torus system is performed in the framework of full general relativity for the first time. A truncated moment formalism is employed for a general relativistic neutrino radiation transport. Several systems in which the black hole mass is M BH = 3 or 6M⊙, the black hole spin is zero, and the torus mass is ≈0.14–0.38M⊙ are evolved as models of the remnant formed after the merger of binary neutron stars or black hole-neutron star binaries. The equation of state and microphysics for the high-density and high-temperature matter are phenomenologically taken into account in a semi-quantitative manner. It is found that the temperature in the inner region of the torus reaches \gtrsim 10 MeV which enhances a high luminosity of neutrinos ∼1051 ergs/s for M BH = 6M⊙ and ∼1052 ergs/s for M BH = 3M⊙. It is shown that neutrinos are likely to be emitted primarily toward the outward direction in the vicinity of the rotational axis and their energy density may be high enough to launch a low-energy short gamma-ray burst via the neutrino-antineutrino pair-annihilation process with the total energy deposition ∼1047–1049 ergs. It is also shown in our model that for M BH = 3M⊙, the neutrino luminosity is larger than the electromagnetic luminosity while for M BH = 6M⊙, the neutrino luminosity is comparable to or slightly smaller than the electromagnetic luminosity.

Subject Index : 420, 425
URL : http://ptp.ipap.jp/link?PTP/127/535/
DOI : 10.1143/PTP.127.535

[ Full Text PDF : FREE ACCESS (2091K) ] Citation:

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