论文标题
GW170817中的积聚到杰特的能量转换效率
Accretion-to-jet energy conversion efficiency in GW170817
论文作者
论文摘要
基于先前发表的GRB 170817A喷气余量的多波长建模（包括VLBI Centroid运动的信息），我们在GW170817合并后的Bipolar Jets中构建了在双极射流中的总概率密度分布。通过为积聚磁盘质量应用新的数值反对拟合公式，我们构建了GW170817残留磁盘质量的后验概率密度分布。通过组合两者，我们估计该系统中的积分到喷射能量转换效率，仔细考虑了不确定性。 GW170817中的积聚到射流的能量转换效率为$η\ sim 10^{ - 3} $，不确定性略小于两个数量级。这种低效率与$ν\barν$机制的期望非常吻合，因此，仅此测量就不能排除。这样的效率也与Blandford-Znajek机制的预期相符，前提是合并后磁盘中的磁场主要是环形的（这是合并动力学的结果）。
Based on previously published multi-wavelength modelling of the GRB 170817A jet afterglow, that includes information from the VLBI centroid motion, we construct the posterior probability density distribution on the total energy in the bipolar jets launched by the GW170817 merger remnant. By applying a new numerical-relativity-informed fitting formula for the accretion disk mass, we construct the posterior probability density distribution of the GW170817 remnant disk mass. By combining the two, we estimate the accretion-to-jet energy conversion efficiency in this system, carefully accounting for uncertainties. The accretion-to-jet energy conversion efficiency in GW170817 is $η\sim 10^{-3}$ with an uncertainty of slightly less than two orders of magnitude. This low efficiency is in good agreement with expectations from the $ν\barν$ mechanism, which therefore cannot be excluded by this measurement alone. Such an efficiency also agrees with that anticipated for the Blandford-Znajek mechanism, provided that the magnetic field in the disk right after the merger is predominantly toroidal (which is expected as a result of the merger dynamics).
