The Low Frequency Perspective on Fast Radio Bursts

TL;DR

This paper reviews low-frequency observations of fast radio bursts (FRBs), highlighting recent discoveries such as periodicity, localizations, and associations with galactic magnetars, which advance understanding of their environments and origins.

Contribution

It provides a comprehensive overview of low-frequency FRB studies, synthesizing recent findings and proposing future research directions in the field.

Findings

Detection of ~500 FRBs between 400-800 MHz by CHIME/FRB

Discovery of periodicity in repeaters and non-repeaters

Localization of an FRB within a globular cluster

Abstract

Fast radio bursts (FRBs) represent one of the most exciting astrophysical discoveries of the recent past. The study of their low-frequency emission, which was only effectively picked up about ten years after their discovery, has helped shape the field thanks to some of the most important detections to date. Observations between 400 and 800 MHz, carried out by the CHIME/FRB telescope, in particular, have led to the detection of ~500 FRBs in little more than 1 year and, among them, ~20 repeating sources. Detections at low frequencies have uncovered a nearby population that we can study in detail via continuous monitoring and targeted campaigns. The latest, most important discoveries include: periodicity, both at the days level in repeaters and at the millisecond level in apparently non-repeating sources; the detection of an FRB-like burst from a galactic magnetar; and the localisation of an FRB inside a globular cluster in a nearby galaxy. The systematic study of the population at low frequencies is important for the characterisation of the environment surrounding the FRBs and, at a global level, to understand the environment of the local universe. This review is intended to give an overview of the efforts leading to the current rich variety of low-frequency studies and to put into a common context the results achieved in order to trace a possible roadmap for future progress in the field.