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首页> 外文期刊>The Astrophysical journal >EVOLUTIONS OF STELLAR-MASS BLACK HOLE HYPERACCRETION SYSTEMS IN THE CENTER OF GAMMA-RAY BURSTS
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EVOLUTIONS OF STELLAR-MASS BLACK HOLE HYPERACCRETION SYSTEMS IN THE CENTER OF GAMMA-RAY BURSTS

机译:伽马射线暴中心的恒星质量黑洞超累积系统的演化

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A neutrino-dominated accretion disk around a stellar-mass black hole (BH) can power a gamma-ray burst (GRB) via annihilation of neutrinos launched from the disk. For the BH hyperaccretion system, high accretion rate should trigger the violent evolution of the BH's characteristics, which further leads to the evolution of the neutrino annihilation luminosity. In this paper, we consider the evolution of the accretion system to analyze the mean time-dependent neutrino annihilation luminosity with the different mean accretion rates and initial BH parameters. By time-integrating the luminosity, the total neutrino annihilation energy with the reasonable initial disk mass can satisfy most short-duration GRBs and about half of long-duration GRBs. Moreover, the extreme Kerr BH should exist in the cental engines of some high-luminosity GRBs. GRBs with higher energy have to request the alternative magnetohydrodynamics processes in the centers, such as the Blandford–Znajek jet from the accretion system or the millisecond magnetar.
机译:恒星质量黑洞(BH)周围以中微子为主的吸积盘可通过an灭从该盘发射的中微子来为伽马射线爆发(GRB)提供动力。对于BH过度积聚系统,高积聚率应触发BH特性的剧烈演变,这进一步导致中微子an灭发光度的演变。在本文中,我们考虑吸积系统的演变,以分析具有不同平均吸积率和初始BH参数的平均时间依赖性中微子an灭光度。通过对光度进行时间积分,具有合理初始圆盘质量的中微子no灭总能量可以满足大多数短期GRB和大约一半长期GRB的需求。此外,极端的Kerr BH应该存在于某些高发光GRB的中央引擎中。具有较高能量的GRB必须要求中心进行替代的磁流体动力学过程,例如吸积系统或毫秒磁石的Blandford–Znajek射流。

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