High-Resolution Radio Image of a Candidate Radio Galaxy at z=5.72

TL;DR

This study presents high-resolution radio imaging of a candidate galaxy at redshift 5.72, supporting its classification as a young radio galaxy in early evolutionary stages.

Contribution

First high-resolution VLBI imaging of the candidate radio galaxy at z=5.72, confirming its nature as a medium-sized symmetric object.

Findings

Detected two faint radio features separated by ~400 mas

Source classified as a medium-sized symmetric object (MSO)

Supports the early evolutionary stage hypothesis

Abstract

Recently, Saxena et al. (2018) reported the discovery of a possible radio galaxy, J1530$+$1049 at a redshift of z=5.72. We observed the source with the European Very Long Baseline Interferometry Network at $1.7$ GHz. We detected two faint radio features with a separation of $\sim 400$ mas. The radio power calculated from the VLA flux density by Saxena et al. (2018), and the projected source size derived from our EVN data place J1530$+$1049 among the medium-sized symmetric objects (MSOs) which are thought to be young counterparts of radio galaxies (An and Baan 2012). Thus, our finding is consistent with a radio galaxy in an early phase of its evolution as proposed by Saxena et al. (2018).