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arXiv 2006.07376astro-ph.HE
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GW170817中吸积-喷流能量转换效率

Accretion-to-jet energy conversion efficiency in GW170817

Om S. Salafia, Bruno Giacomazzo

摘要:

基于先前发表的多波长建模的GRB 170817 A喷流余辉,其中包括从VLBI质心运动的信息,我们构建的后验概率密度分布的总能量在双极射流发射的GW 170817合并残余。通过对吸积盘质量的一个新的数值相对论拟合公式的应用,我们构造了GW 170817残留盘质量的后验概率密度分布。通过结合两者,我们估计在这个系统中的吸积喷流能量转换效率,仔细考虑不确定性。GW 170817的吸积-喷流能量转换效率为$η\sim 10^{-3}$,不确定度略小于两个数量级。这种低效率与来自$ν\barν$机制的预期非常一致,因此不能仅通过这种测量来排除。这样的效率也与布兰德福德-兹纳杰克机制的预期一致,只要在合并后的磁盘中的磁场主要是环形的(这是合并动力学的结果)。

英文摘要:

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).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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