A Unified Geometric Model of Repeating and Non-Repeating Fast Radio Bursts
arxiv(2023)
摘要
Fast radio bursts (FRBs) are millisecond-duration extragalactic radio
transients. They apparently fall into repeaters and non-repeaters. However,
such a classification has lacked a motivation on the physical picture. Here we
propose a unified geometric model to distinguish between the repeaters and
non-repeaters, in which the quasi-tangential (QT) propagation effect within the
magnetospheric polar cap of a neutron star is considered. In this model, the
non-repeaters arise from the sources whose emitting region has a smaller impact
angle with respect to the magnetic axis, while the repeaters come from the
sources whose emitting region has a larger impact angle. The observational
discriminant polarization properties between the repeaters and non-repeaters
are an important clue to verifying this unified geometric model since the
polarization is sensitive to the QT propagation effect. Moreover, our model
effectively explains all of the other discriminant properties, including
bandwidth, duration, peak luminosity, energy, brightness temperature,
time-frequency downward drifting, and repetition rate, providing compelling
evidence for the magnetospheric origin of FRBs.
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