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arXiv 1407.6550astro-ph.HE
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GRB观测和宇宙学中的黑洞自旋下降

Black hole spin down in GRB observations and Cosmology

Antonios Nathanail, Ioannis Contopoulos, Spyros Basilakos

摘要:

根据Blandford和Znajek(1977)的观点,如果旋转的黑洞被赋予一个由周围圆盘中的电流支持的磁场,那么能量可以通过电磁方式从黑洞中提取出来。我们表明,精确模型的黑洞磁层产生坡印廷通量,几乎随时间呈指数下降。我们通过斯威夫特BAT-XRT光变曲线,并确定了一个子类的伽玛暴,表现出明显的指数衰减超过三个数量级的流量(EDOHS伽玛暴)。我们估计的能量给出了在X射线,并讨论了可能的相关性之间的峰值亮度的X射线的即时发射和它的衰变时间。我们研究了这个结果在高红移宇宙学中的一个可能的应用。

英文摘要:

According to Blandford & Znajek (1977), energy can be extracted electromagnetically from a rotating black hole, should the latter be endowed with a magnetic field supported by electric currents in a surrounding disk. We show that exact models of black hole magnetospheres produce Poynting flux that decreases almost exponentially with time. We went through the Swift BAT-XRT lightcurves and identified a subclass of GRBs that exhibits a clear exponential decay over more than three orders of magnitude in flux (EDOHS GRBs). We estimate the energy given-off in the X-rays and discuss a possible correlation between the peak brightness of the X-ray prompt emission and its decay time. We investigate a possible application of this result in high redshift Cosmology.

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