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

Omar, Amitesh; Saxena, A.; Chand, Krishan; Paswan, Abhishek; Röttgering, H. J. A.; Duncan, K. J.; Kumar, T. S.; Krishnareddy, B.; Pant, Jayshreekar

doi:10.1007/s12036-019-9583-4

Cited by 11 publications

(9 citation statements)

References 41 publications

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“…This indicates that stars fainter than 24 mag in B filter have been detected with an accuracy of ∼ 0.2 mag in an effective exposure time of 20 min. Using the FOSC, a 24.5 mag object has been detected with an accuracy of 0.2 mag in one hour of integration time in i−band (Omar et al 2019b). The detection limits at optical wavelengths are at par with the performance of other 3.6 meter aperture optical telescopes located at good observing sites.…”

Section: Capabilities At Optical Wavelengthsmentioning

confidence: 99%

“…The detection limits at optical wavelengths are at par with the performance of other 3.6 meter aperture optical telescopes located at good observing sites. The night sky brightness values are estimated to be 21 and 20.4 (mag arcsec −2 ) in the r and i bands respectively (Omar et al 2019b). These numbers indicate that the night sky at Devasthal is dark and it has not degraded since late 1990s when Devasthal site characterization was carried out.…”

Section: Capabilities At Optical Wavelengthsmentioning

confidence: 99%

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Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy

Sagar¹,

Kumar²,

Subramaniam³

2019

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India and Belgium have jointly established two 4-meter class optical telescopes at Devasthal located in Nainital, India. After successful installation of the 3.6-m modern new technology Devasthal Optical Telescope (DOT) in 2015, it was technically activated by premiers of both countries from Brussels on March 30, 2016. Since then, the 3.6-m DOT has been used for both optical and near-Infrared (NIR) observations for a number of research proposals. The best angular resolution achieved is 0″.4 indicating that the optics of the 3.6-m DOT is good and capable of providing images of celestial bodies with sub-arc-second resolution. The observations provide proof that the care taken in the construction of the telescope dome building has paid a rich dividend as their thermal mass is so low that it has not degraded the natural atmospheric seeing at Devasthal measured about two decades ago during 1997 to 1999 using differential image motion monitor. A few preliminary scientific results obtained from recent observations are presented along with performance and global potential of the 3.6-m DOT in the field of galactic astronomy. The 3.6-m DOT is capable of providing internationally competitive science once high resolution spectrograph and other planned modern back-end instruments become operational. Geographical location of the observatory has global importance for time domain and multi-wavelength astrophysical studies.

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Section: Capabilities At Optical Wavelengthsmentioning

confidence: 99%

Section: Capabilities At Optical Wavelengthsmentioning

confidence: 99%

Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy

Sagar¹,

Kumar²,

Subramaniam³

2019

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“…ADFOSC has the capability of obtaining deep images with a precision of about 0.2 mag for a 24 magnitude object in about 1 hour of integration. Recently, Omar et al (2019b) reported the DOT i-band detection of a high-redshift candidate radio galaxy discovered from GMRT data (see Figure 4). Therefore, searches for such red objects in the i and z bands with ADFOSC are expected to be as fruitful as that in the NIR bands using TIRCAM-2.…”

Section: Synergy With Gmrt and Other Radio Telescopesmentioning

confidence: 99%

Global performance and capabilities of the instruments on the 3.6-m Devasthal Optical Telescope

Omar¹,

Reddy²,

Kumar³

et al. 2019

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The recently commissioned 3.6-m Devasthal optical telescope has been used for various tests and science observations using three main instruments, namely, a charge-coupled device camera, a near-infrared camera, and an optical imager-cum-spectrograph. The published results from these instruments assert that the performance of the telescope at the Devasthal site is at par with the expectations. These back-end instruments open up vast opportunities for high-sensitivity observations of the celestial sky with the telescope. This paper provides a summary of the existing back-end instruments and attempts to highlight the importance of the Devasthal optical telescope in synergy with other telescopes operating at different wavelengths.

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“…Figure 2 shows the pictures of the as-built telescope along with back-end instruments being used for regular observations. For observations at optical wavelengths, 4K × 4K CCD IMAGER (Pandey et al 2018) and Faint Object Spectrograph and Camera (FOSC) (Omar et al 2012(Omar et al , 2019a are used while TIRCAM2, acronym for TIFR Near Infrared Imaging Camera-II, is used in NIR region. The 3.6-m DOT was used for detailed characterisation of these instruments as well as for some science programs, which included photometric and spectroscopic study of supernovae, optical transient events, AGNs and quasars, galactic star forming regions, and distant galaxies.…”

Section: Introductionmentioning

confidence: 99%

Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy

Sagar¹,

Kumar²,

Subramaniam³

2019

Preprint

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India and Belgium have jointly established two 4 meter class optical telescopes at Devasthal located in Nainital, India. After successful installation of the 3.6-m modern new technology Devasthal Optical Telescope (DOT) in 2015, it was technically activated by premiers of both countries from Brussels on March 30, 2016. Since then, the 3.6-m DOT has been used for both optical and near-Infrared (NIR) observations for a number of research proposals. The best angular resolution achieved is 0. 4 indicating that the optics of the 3.6-m DOT is good and capable of providing images of the celestial bodies with sub-arc-second resolution. The observations provide proof that the care taken in the construction of the telescope dome building has paid a rich dividend as their thermal mass is so low that it has not degraded the natural atmospheric seeing at Devasthal measured about two decades ago during 1997 to 1999 using differential image motion monitor.A few preliminary scientific results obtained from recent observations are presented along with performance and global potential of the 3.6-m DOT in the field of galactic astronomy. The 3.6-m DOT is capable of providing internationally competitive science once high resolution spectrograph and other planned modern back-end instruments become operational. Geographical location of the observatory has global importance for the time domain and multi-wavelength astrophysical studies.

show abstract

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

Cited by 11 publications

References 41 publications

Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy

Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy

Global performance and capabilities of the instruments on the 3.6-m Devasthal Optical Telescope

Scientific potential of the Indo-Belgian 3.6-m DOT in the field of Galactic Astronomy

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