Searching for FRB persistent radio source counterparts in dwarf galaxies using LOFAR

TL;DR

This paper searches for persistent radio sources in dwarf galaxies using LOFAR to identify potential FRB counterparts and distinguish them from intermediate mass black holes, aiming to expand the sample of known sources.

Contribution

It introduces a new search strategy for compact radio sources in dwarf galaxies to identify FRB counterparts and differentiate them from black holes.

Findings

Identified candidate sources in dwarf galaxies

Discussed strategies to distinguish FRB hosts from black holes

Enhanced understanding of PRS in dwarf galaxies

Abstract

The repeating FRB 20121102A was localized to a star-forming region in a dwarf galaxy and found to be co-located with a persistent radio source (PRS). FRB 20190520B is only the second known source sharing phenomenology akin to FRB 20121102A's, with similar burst activity, host galaxy properties, as well as being associated with a PRS. PRS emission is potentially a calorimeter, allowing us to estimate the energy output of the central FRB engine. Independently of FRB studies, PRSs have been found in dwarf galaxies and interpreted as intermediate mass black holes. To improve our understanding of such sources associated with dwarf galaxies, it is imperative to increase the known sample size. Here, we present a search for compact radio sources coincident with dwarf galaxies, discuss source candidates and planned strategies to differentiate them between candidate FRB hosts and intermediate mass black holes.