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Variabilities of Gamma-ray Bursts from Black Hole Hyper-accretion Disks

The emission from black hole binaries (BHBs) and active galactic nuclei (AGNs) displays significant aperiodic variabilities. The most promising explanation for these variabilities is the propagating fluctuations in the accretion flow. It is natural to expect that the mechanism driving variabilities in BHBs and AGNs may operate in a black hole hyper-accretion disk, which is believed to power gamma-ray bursts (GRBs). We study the variabilities of jet power in GRBs based on the model of propagating fluctuations. It is found that the variabilities of jet power and the temporal profile of erratic spikes in this scenario are similar to those in observed light curves of prompt gamma-ray emission of GRBs. Our results show that the mechanism driving X-ray variabilities in BHBs and AGNs may operate in the central engine to drive the variabilities of GRBs.

preprint2016arXivOpen access
Da-Bin LinZu-Jia LuHui-Jun MuTong LiuShu-Jin HouJing LvWei-Min GuEn-Wei Liang
astro-ph.HE
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Da-Bin LinZu-Jia LuHui-Jun MuTong LiuShu-Jin HouJing LvWei-Min GuEn-Wei Liang

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