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A depolarisation census of ASKAP fast radio bursts by Uttarkar, Pavan A.; Shannon, Ryan M.; Gourdji, Kelly; Deller, Adam T.; Dial, Tyson; Glowacki, Marcin; Bera, Apurba; Gordon, Alexa C.; Ryder, Stuart D.; Tejos, Nicolas; Bhandari, Shivani; Wang, Yuanming is a scholarly article available to read on EtoBox.

What is A depolarisation census of ASKAP fast radio bursts about?

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 $\rm \sigma^{\prime}_{RM}$, 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 $\rm \sigma^{\prime}_{RM}$ 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 r

Author

Uttarkar, Pavan A.; Shannon, Ryan M.; Gourdji, Kelly; Deller, Adam T.; Dial, Tyson; Glowacki, Marcin; Bera, Apurba; Gordon, Alexa C.; Ryder, Stuart D.; Tejos, Nicolas; Bhandari, Shivani; Wang, Yuanming

Published

2025

Language

EN