# Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope

## TL;DR

This study demonstrates the capability of the 3.6-m Devasthal Optical Telescope to detect faint high-redshift galaxy candidates, providing valuable optical data to complement radio and infrared observations.

## Contribution

First optical detection of a candidate high-redshift radio galaxy using the 3.6-m Devasthal Optical Telescope, showcasing its potential for studying distant faint galaxies.

## Key findings

- Detected in i-band with AB 24.3 mag
- Undetected in r-band with AB 24.4 mag
- Estimated i-K color suggests active star formation

## Abstract

We report optical observations of TGSS J1054+5832, a candidate high-redshift ($z=4.8\pm2$) steep-spectrum radio galaxy, in $r$ and $i$ bands using the faint object spectrograph and camera mounted on 3.6-m Devasthal Optical Telescope (DOT). The source previously detected at 150 MHz from Giant Meterwave Radio Telescope and at 1420 MHz from Very Large Array has a known counterpart in near-infrared bands with $K$-band magnitude of AB 22. The source is detected in $i$-band with AB$24.3\pm0.2$ magnitude in the DOT images presented here. The source remains undetected in the $r$-band image at a 2.5$\sigma$ depth of AB 24.4 mag over an $1.2''\times1.2''$ aperture. An upper limit to $i-K$ color is estimated to be $\sim$2.3, suggesting youthfulness of the galaxy with active star formation. These observations highlight the importance and potential of the 3.6-m DOT for detections of faint galaxies.