SUNIL CHANDRA
Articles written in Journal of Astrophysics and Astronomy
Volume 42 All articles Published: 25 May 2021 Article ID 0017 PAYLOAD REVIEW
Science with the AstroSat Soft X-ray telescope: An overview
SUDIP BHATTACHARYYA KULINDER PAL SINGH GORDON STEWART SUNIL CHANDRA GULAB C. DEWANGAN NILIMA S. KAMBLE SANDEEP VISHWAKARMA JAYPRAKASH G. KOYANDE VARSHA CHITNIS
The Soft X-ray Telescope (SXT) aboard the AstroSat satellite is the first Indian X-ray telescope in space. It is a modest size X-ray telescope with a charge coupled device (CCD) camera in the focal plane, which provides X-ray images in the $\sim$0.3–8.0 keV band. A forte of SXT is in providing undistorted spectraof relatively bright X-ray sources, in which it excels over some current large CCD-based X-ray telescopes. Here, we highlight some of the published spectral and timing results obtained using the SXT data to demonstrate the capabilities and overall performance of this telescope.
Volume 44 All articles Published: 7 June 2023 Article ID 0054
Near infrared background with 1.2-m telescope at Mount Abu
PRACHI PRAJAPATI ANWESH MISHRA ANANYA RAWAT SHASHIKIRAN GANESH VISHAL JOSHI NAVPREET KAUR NEERAJ KUMARI SACHINDRA NAIK SUNIL CHANDRA
We present an estimation and analysis of Near Infrared (NIR) background for the astronomical site at Mount Abu. Mount Abu Observatory is situated at Gurushikhar, Rajasthan, India, operated by the Physical Research Laboratory. Data obtained from the NIR observations of various sources using the Near Infrared Camera/Spectrograph (NICS) on the 1.2-m telescope are used to derive the NIR background estimates. We notice seasonal variations in these values, with the summer months showing brighter background compared to the winter. We also present a comparison of synthetic atmospheric transmission at Mount Abu with otherIndian observatories at various altitudes. We identify the plausible contributors to the NIR background in our observations and discuss the potential ones that can contribute to the noticed seasonal variations. Overall, we found that the NIR background does not show any systematic variation over the period of observations from 2010 to 2019. The results reported here are specific to the NICS instrument on the 1.2-m telescope.
Volume 44, 2023
All articles
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