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      https://www.ias.ac.in/article/fulltext/joaa/040/02/0009

    • Keywords

       

      Galaxies: high-redshift; galaxies: individual (TGSS J1054+5832); galaxies: active; telescopes: Devasthal Optical Telescope; instrumentation: spectrographs and CCD imagers.

    • 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 AB24.3 $\pm$ 0.2 magnitude in theDOT 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-mDOT for detections of faint galaxies.

    • Author Affiliations

       

      A. OMAR1 A. SAXENA2 K. CHAND1 A. PASWAN1 3 H. J. A. RÖTTGERING2 K. J. DUNCAN2 T. S. KUMAR1 B. KRISHNAREDDY1 J. PANT1

      1. Aryabhatta Research Institute of Observational-Sciences, Manora Peak, Nainital 263001, India.
      2. Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands.
      3. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India.
    • Dates

       
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