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

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Scientific paper

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_{&sun;}, the black hole spin is zero, and the torus mass is ≈ 0.14-0.38M_{&sun;} 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 ≳ 10 MeV which enhances a high luminosity of neutrinos ˜ 10^{51} ergs/s for M_{BH} = 6M_{&sun;} and ˜ 10^{52} ergs/s for M_{BH} = 3M_{&sun;}. 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 ˜ 10^{47}-10^{49} ergs. It is also shown in our model that for M_{BH} = 3M_{&sun;}, the neutrino luminosity is larger than the electromagnetic luminosity while for M_{BH} = 6M_{&sun;}, the neutrino luminosity is comparable to or slightly smaller than the electromagnetic luminosity.

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