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

Abstract

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 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 $1.2^{\prime \prime }\times 1.2^{\prime \prime }$ 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.

7 pages, 2 figures, Accepted in Jr. of Astrophysics & Astronomy (JApA)

References in corpus (8)

• EAZY: A Fast, Public Photometric Redshift Code
• Distant Radio Galaxies and their Environments
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• The UKIRT Infrared Deep Sky Survey Early Data Release
• The Lockman Hole project: LOFAR observations and spectral index properties of low-frequency radio sources
• A search for faint high-redshift radio galaxy candidates at 150 MHz
• The DRaGONS Survey: A Search for High Redshift Radio Galaxies And Heavily Obscured AGNs
• Scientific capabilities and advantages of the 3.6 meter optical telescope at Devasthal, Uttarakhand