Memory in the Burst Occurrence of Repeating FRBs
arxiv(2023)
摘要
Understanding the nature of repeating FRBs is crucial to probe the physics of
FRBs. In this work, we analyze the statistics of waiting time between bursts of
three repeating FRBs from four data sets. We find a universally pronounced
dependency of the waiting times on the previous time interval (denoted as
$\lambda_0$). We observe a temporal clustering where short waiting times tend
to be followed by short ones, and long by long. This memory dependency is
manifested in the conditional mean waiting time as well as in the conditional
mean residual time to the next burst, both of which increase in direct
proportion to $\lambda_0$. Consequently, the likelihood of experiencing a
subsequent FRB burst within a given time window after the preceding burst is
significantly influenced by the burst history. We reveal that, for the first
time, these memory effects are present in the scale-invariant preconditioned
waiting time distribution. We show that the memory effect provides a unified
description of waiting times which may account for both the repeating FRBs and
the apparent non-repeating FRBs (i.e. only observed one time). These results
shed new light on the mechanism of FRBs.
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