DOI

https://doi.org/10.48717/3czx-th52

Project

EB104

Title

Multi-freq study on FRB PRSs - FRB190520

Abstract

Fast radio bursts are energetic flashes of coherent radio emission that last from a few tens of microseconds to a couple of milliseconds. While the exact nature and origins of FRBs are still a subject of ongoing research and debate, one intriguing aspect that has emerged is the apparent association of persistent radio sources (PRSs) with two repeating FRB sources. These PRS are thought to be a magnetar or a pulsar wind nebula. They are also theorised to be black holes accelerating from their companion at super high Eddington limits forming a hypernebula. Detailed and multi-frequency VLBI observations of a known PRS directly probe the local environment of an FRB source. The properties of the PRS such as its size, luminosity and spectrum coupled with the properties of the burst themselves thus play a crucial role in distinguishing between models. The goal of this proposal is to conduct multi-frequency observations of PRS associated with two repeating FRBs in order to study their spectra and better constrain their size at the smallest angular scales. These findings will help us to refine the FRB progenitor models shedding light on the nature of PRSs.