Statistical Properties of X-Ray Bursts from SGR J1935+2154 Detected by Insight-HXMT

As one class of the most important objects in the universe, magnetars can produce a lot of different frequency bursts including X-ray bursts. In Cai et al., 75 X-ray bursts produced by magnetar SGR J1935+2154 during an active period in 2020 are published, including the duration and net photon counts of each burst, and waiting time based on the trigger time difference. In this paper, we utilize the power-law model, dN(x)/dx proportional to (x + x(0))(-alpha x), to fit the cumulative distributions of these parameters. It can be found that all the cumulative distributions can be well fitted, which can be interpreted by a self-organizing criticality theory. Furthermore, we check whether this phenomenon still exists in different energy bands and find that there is no obvious evolution. These findings further confirm that the X-ray bursts from magnetars are likely to be generated by some self-organizing critical process, which can be explained by a possible magnetic reconnection scenario in magnetars.

Automated summary

This study published 75 X-ray bursts produced by magnetar SGR J1935+2154 during an active period in 2020, including the analysis of the duration, net photon counts, and waiting time for each burst. The cumulative distributions of these parameters were well-fitted by a power-law model, suggesting a self-organizing criticality phenomenon. The study also found no significant evolution of this phenomenon in different energy bands.