Radiation Magnetohydrodynamics for Black Hole-Torus System in Full General Relativity : A Step toward Physical Simulation(Astrophysics and Cosmology)

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概要

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• 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_&xdot;, the black hole spin is zero, and the torus mass is ≈0.14-0.38 M_&xdot; 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 &scim;10 MeV which enhances a high luminosity of neutrinos 〜10^<51> ergs/s for M_<BH> = 6 M_&xdot; and 〜10^<52> ergs/s for M_<BH> = 3 M_&xdot;. 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> = 3 M_&xdot;, the neutrino luminosity is larger than the electromagnetic luminosity while for M_<BH> = 6 M_&xdot;, the neutrino luminosity is comparable to or slightly smaller than the electromagnetic luminosity.

• 2012-03-25

著者

• SEKIGUCHI Yuichiro

  Division of Theoretical Astronomy, National Astronomical Observatory of Japan

• Shibata Masaru

  Yukawa Institute For Theoretical Physics Kyoto University

• SEKIGUCHI Yuichiro

  Graduate School of Arts and Sciences, University of Tokyo

• SEKIGUCHI Yuichiro

  Yukawa Institute for Theoretical Physics, Kyoto University

• Sekiguchi Yuichiro

  Yukawa Institute For Theoretical Physics Kyoto University

• SHIBATA Masaru

  Yukawa Institute for Theoretical Physics, Kyoto University

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