DOI

https://doi.org/10.48717/366z-jr09

Project

EB116

Title

EVN follow-up of candidate PRS

Abstract

Fast radio bursts (FRBs) are extremely bright (Jy), millisecond-long transients. Despite more than 700 FRBs, their origin is still controversial because of the lack of detection at any other wavelength. Deep investigation of the environment where the bursts occur is the most promising way to shed light on these mysterious phenomena. Observations of a handful of events so far indicated different progenitor channels, yielding to distinct location, local environment and host galaxy properties. Recently, a nebular origin for the persistent radio source (PRS) associated with 3 FRB so far was proved via deep radio observations, allowing to verify the expected luminosity vs rotation measure relation foreseen by theoretical arguments. With this proposal, we aim at confirming three candidate PRS, recently detected at lower resolution with either MeerKAT and uGMRT, or VLA. An EVN detection, confirming their compact nature, would allow us to further refine the nebula model in the 100--1000 rad/m^2 range, where the steepness of the power law is determined, revealing the physical conditions in the immediate surroundings of the FRB central engine.