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

We report optical observations of TGSS J1054+5832, a candidate high-redshift (\(z=4.8\pm 2\)) 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 (GMRT) 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\(24.3\pm 0.2\) 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 \(1.2''\times 1.2''\) 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.