所属领域：
空间引力波探测领域
资源类型：
引力波探测
/ 双星绕转
文献作者：
Janka, HT; Eberl, T; Ruffert, M; Fryer, CL
文献发表年份：
1999
文献期刊：
ASTROPHYSICAL JOURNAL
文献摘要：Hydrodynamic simulations of the merger of stellar mass black hole-neutron star binaries are compared with mergers of binary neutron stars. The simulations are Newtonian but take into account the emission and back-reaction of gravitational waves. The use of a physical nuclear equation of state allows us to include the effects of neutrino emission. For low neutron star-to-black hale mass ratios, the neutron star transfers mass to the black hole during a few cycles of orbital decay and subsequent widening before finally being disrupted, whereas for ratios near unity the neutron star is destroyed during its first approach. A gas mass between similar to 0.3 and similar to 0.7 M. is left in an accretion torus around the black hole and radiates neutrinos at a luminosity of several times 10(53) ergs s(-1) during an estimated accretion timescale of about 0.1 a. The emitted neutrinos and antineutrinos annihilate into e(+/-) pairs with efficiencies of 1%-3% and rates of up to similar to 2 x 10(52) ergs s(-1), thus depositing an energy E-nu<(nu)over bar> less than or similar to 10(51) ergs above the poles of the black hole in a region that contains less than 10(-5) M. of baryonic matter. This could allow for relativistic expansion with Lorentz factors around 100 and is sufficient to explain apparent burst luminosities L-gamma similar to E-nu<(nu)over bar>(f(Omega)t(gamma)) up to several times 10(53) ergs s(-1) for burst durations t(gamma) approximate to 0.1-1 s, if the gamma emission is collimated in two moderately focused jets in a fraction f(Omega) = 2 delta Omega/(4 pi) approximate to (1/100)-(1/10) of the sky.
文献类型： Article
文献语种： English
关键词： BINARY COALESCENCE; PHYSICAL MODELS; EVOLUTION; HYDRODYNAMICS; EMISSION; STEP
文献作者地址： Max Planck Inst Astrophys, D-85748 Garching, Germany; Tech Univ Munich, Dept Phys E12, D-85748 Garching, Germany; Univ Edinburgh, Dept Math & Stat, Edinburgh EH9 3JZ, Midlothian, Scotland; Univ Calif Santa Cruz, Univ Calif Observ, Lick Observ, Santa Cruz, CA 95064 USA
