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 (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.
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Acknowledgements
We thank the staff of ARIES and DOT that made these observations possible. The supports received from Department of Science and Technology, Government of India, Governing council of ARIES, and project management members of the DOT project are duly acknowledged. AO acknowledges academic, technical, and administrative supports received from the staff of ARIES, national and international organizations and industries to design and develop ADFOSC in India. The \(4096\times 4096\) CCD camera was developed in ARIES, Nainital in technical collaboration with Herzberg Institute of Astrophysics, Canada.
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Omar, A., Saxena, A., Chand, K. et al. Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope. J Astrophys Astron 40, 9 (2019). https://doi.org/10.1007/s12036-019-9583-4
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DOI: https://doi.org/10.1007/s12036-019-9583-4