Finding the particularity of the active episode of SGR J1935+2154 during which FRB 20200428 occurred: Implication from a statistics of Fermi/GBM X-ray bursts
arxiv(2024)
摘要
By using the Fermi/GBM data of the X-ray bursts (XRBs) of SGR
J1935+2154, we investigate the temporal clustering of the bursts and the
cumulative distribution of the waiting time and fluence/flux. It is found that
the bursts occurring in the episode hosting FRB 20200428 have obviously shorter
waiting times than those in the other episodes. The general statistical
properties of the XRBs further indicate they could belong to a self-organized
critical (SOC) system (e.g., starquakes), making them very similar to the
earthquake phenomena. Then, according to a unified scaling law between the
waiting time and energy of the earthquakes as well as their aftershocks, we
implement an analogy analysis on the XRBs and find that the FRB episode owns
more dependent burst events than the other episodes. It is indicated that the
FRB emission could be produced by the interaction between different burst
events, which could correspond to a collision between different seismic/Alfven
waves or different explosion outflows. Such a situation could appear when the
magnetar enters into a global intensive activity period.
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