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 ($$z=4.8\pm 2$$z=4.8±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$$24.3\pm 0.2$$24.3±0.2 magnitude in the DOT images presented here. The source remains undetected in the r-band image at a 2.5$$\sigma $$σ depth of AB 24.4 mag over an $$1.2''\times 1.2''$$1.2′′×1.2′′ aperture. An upper limit to $$i-K$$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.