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.

arXiv comment7 pages, 2 figures, Accepted in Jr. of Astrophysics & Astronomy (JApA)

References in corpus (29)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• EAZY: A Fast, Public Photometric Redshift Code
• The GMRT 150 MHz All-sky Radio Survey: First Alternative Data Release TGSS ADR1
• A Significant Population of Red, Near-IR Selected High Redshift Galaxies
• Distant Radio Galaxies and their Environments
• The radio luminosity function from the low-frequency 3CRR, 6CE & 7CRS complete samples
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• The UKIRT Infrared Deep Sky Survey Early Data Release
• Near-infrared imaging and the K-z relation for radio galaxies in the 7C Redshift Survey
• A Sample of 669 Ultra Steep Spectrum Radio Sources to Find High Redshift Radio Galaxies
• HST, radio and infrared observations of 28 3CR radio galaxies at redshift z ~ 1: I. Old stellar populations in central cluster galaxies
• A Radio Galaxy at z=5.19
• Optical and Near-IR Imaging of Ultra Steep Spectrum Radio Sources - The K-z diagram of radio and optically selected galaxies
• A sample of 6C radio sources designed to find objects at redshift > 4: III --- imaging and the radio galaxy K-z relation
• The radio galaxy K-z relation: the 10^12 Msol mass limit; masses of galaxies from the L_K luminosity, up to z >4
• The X-ray -- radio alignment in the z = 2.2 radio galaxy PKS 1138--262
• The Lockman Hole project: LOFAR observations and spectral index properties of low-frequency radio sources
• The luminosity-dependent high-redshift turnover in the steep spectrum radio luminosity function: clear evidence for downsizing in the radio-AGN population
• Discovery of a radio galaxy at z = 5.72
• On the redshift cut-off for steep-spectrum radio sources
• New Insights on the z-alpha Correlation from Complete Radio Samples
• The environments of high redshift radio galaxies and quasars: probes of protoclusters
• Stellar Masses of Lyman Break Galaxies, Lyman Alpha Emitters and Radio Galaxies in Overdense Regions at z=4-6
• Cosmic downsizing of powerful radio galaxies to low radio luminosities
• A search for faint high-redshift radio galaxy candidates at 150 MHz
• Proto-clusters and the clustering of distant galaxies and radio sources
• 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
• Ultraviolet color-color relation of early-type galaxies at 0.05 < z < 0.12

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