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A depolarisation census of ASKAP fast radio bursts
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A depolarisation census of ASKAP fast radio bursts
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Paper
A depolarisation census of ASKAP fast radio bursts
2025
Overview
Fast radio bursts (FRBs) are luminous, dispersed pulses of extra-galactic origin. The physics of the emission mechanism, the progenitor environment, and their origin are unclear. Some repeating FRBs are observed to have frequency-dependent exponential suppression in linear polarisation fraction. This has been attributed to multipath propagation in a surrounding complex magneto-ionic environment. The magnitude of depolarisation can be quantified using the parameter \\( ^_RM\\), which can be used to model the magneto-ionic complexity of the medium. In addition to depolarisation, some repeating sources (in particular those with active magneto-ionic environments) have been identified to have co-located persistent radio sources (PRS). Searches for depolarisation of non-repeating sources are challenging due to the limited bandwidth of most FRB detection systems used to detect one-off bursts. However, even with a limited bandwidth, such depolarisation can be identified if it lies within the \\( ^_RM\\) sensitivity window of the telescope. In this paper, we present a search for depolarisation in \\(12\\) one-off FRBs detected by the Australian SKA Pathfinder. We report on the first strongly depolarised FRB detected by ASKAP (FRB\\(~\\)20230526A) and a marginal detection of depolarisation in a second. We also report constraints on the presence of a PRS coincident with FRB\\(~\\)20230526A using observations obtained with the Australia Telescope Compact Array. We use this to study the relationship between \\( ^_RM\\) and PRS luminosity. Our investigation supports a scenario in which repeaters and non-repeaters share a common origin and where non-repeaters represent an older population relative to repeating FRBs.
Publisher
Cornell University Library, arXiv.org
Subject
