High-redshift radio galaxies at low radio frequencies

TL;DR

This paper discusses a campaign to identify high-redshift radio galaxies using low-frequency radio observations, leading to the discovery of the most distant known radio galaxy at redshift 5.72, providing insights into early galaxy formation.

Contribution

It introduces a new low-frequency radio survey campaign that successfully finds and studies the most distant radio galaxies, including a record-breaking z=5.72 galaxy.

Findings

Discovery of the most distant radio galaxy at z=5.72

Identification of promising high-redshift radio sources at 150 MHz

Enhanced understanding of early galaxy and supermassive black hole evolution

Abstract

High-redshift radio galaxies (HzRGs) are some of the rarest objects in the Universe. They are often found to be the most massive galaxies observed at any epoch and are known to harbour active supermassive black holes that give rise to powerful relativistic jets. Finding such galaxies at high redshifts can shed light on the processes that shaped the most massive galaxies very early in the Universe. We have started a new campaign to identify and follow-up promising radio sources selected at 150 MHz in a bid to identify the most distant radio galaxies and study their properties, both intrinsic and environmental. Here we describe the progress of our campaign so far, highlighting in particular the discovery of the most distant radio galaxy known till date, at z = 5.72.