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Paper detail

Black hole spin down in GRB observations and Cosmology

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.

preprint2015arXivOpen access
Antonios NathanailIoannis ContopoulosSpyros Basilakos
astro-ph.HE
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Antonios NathanailIoannis ContopoulosSpyros Basilakos

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