Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope. (arXiv:1902.05856v1 [astro-ph.GA])

Optical detection of a GMRT-detected candidate high-redshift radio galaxy with 3.6-m Devasthal optical telescope. (arXiv:1902.05856v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Omar_A/0/1/0/all/0/1">A. Omar</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Saxena_A/0/1/0/all/0/1">A. Saxena</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Chand_K/0/1/0/all/0/1">K. Chand</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Paswan_A/0/1/0/all/0/1">A. Paswan</a> (3), <a href="http://arxiv.org/find/astro-ph/1/au:+Rottgering_H/0/1/0/all/0/1">H. J. A. Rottgering</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Duncan_K/0/1/0/all/0/1">K. J. Duncan</a> (2), <a href="http://arxiv.org/find/astro-ph/1/au:+Kumar_T/0/1/0/all/0/1">T. S. Kumar</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Krishnareddy_B/0/1/0/all/0/1">B. Krishnareddy</a> (1), <a href="http://arxiv.org/find/astro-ph/1/au:+Pant_J/0/1/0/all/0/1">J. Pant</a> (1) ((1) ARIES, Nainital (2) Leiden University, Leiden (3) IUCAA, Pune)

We report optical observations of TGSS J1054+5832, a candidate high-redshift
($z=4.8pm2$) 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$24.3pm0.2$ 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 $1.2”times1.2”$ 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.

We report optical observations of TGSS J1054+5832, a candidate high-redshift
($z=4.8pm2$) 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$24.3pm0.2$ 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 $1.2”times1.2”$ 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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