20 citations · 78 across the 11 of their papers we have counts for
11 papers
2017 Outburst of H 1743-322: AstroSat and Swift View
Pragati Sahu, Swadesh Chand, Parijat Thakur +4
We perform a comprehensive timing and broadband spectral analysis using an AstroSat observation of the low-mass black hole X-ray binary H~1743--322 during 2017 outburst. Additional…
Far-Ultraviolet Spectroscopy Of Active Galactic Nuclei With AstroSat/UVIT
Shrabani Kumar, G. C. Dewangan, K. P. Singh +4
$\require{mediawiki-texvc}$ We study accretion disk emission from eight Seyfert active galactic nuclei (AGN) using far ultra-violet ( ) slit-less grating sp…
Multi-wavelength study of NGC 1365: The obscured active nucleus and off-nuclear compact X-ray sources
Subhashree Swain, Gulab Chand Dewangan, P. Shalima +2
We present a multi-wavelength study of the active nucleus and the off-nuclear X-ray sources in the nearby spiral galaxy, NGC 1365 using three simultaneous UV/X-ray observations by…
Thermal Comptonization in a changing corona in the changing-look active galaxy NGC 1566
Prakash Tripathi, Gulab C. Dewangan
We present broadband UV/X-ray spectral variability of the changing-look active galactic nucleus NGC 1566 based on simultaneous near-ultraviolet (NUV) and X-ray observations perform…
AstroSat view of the newly discovered X-ray transient MAXI~J1803--298 in the Hard-intermediate state
Swadesh Chand, G. C. Dewangan, Parijat Thakur +2
We perform comprehensive temporal and spectral analysis of the newly discovered X-ray transient MAXI~J1803--298 using an AstroSat target of opportunity observation on May 11, 2021…
AstroSat view of spectral transition in the changing-look active galaxy NGC1566 during the declining phase of the 2018 outburst
Prakash Tripathi, Gulab C. Dewangan
NGC1566 is a changing-look active galaxy that exhibited an outburst during 2017-2018 with a peak in June 2018. We triggered AstroSat observations of NGC 1566 twice in August and Oc…
Revealing Thermal Comptonization of accretion-disk photons in IC4329A with AstroSat
Prakash Tripathi, Gulab Chand Dewangan, I. E. Papadakis +1
We present five simultaneous UV/X-ray observations of IC4329A by AstroSat, performed over {a five-month} period. We utilize the excellent spatial resolution of the Ultra-Violet Ima…
AstroSat/UVIT observations of IC4329A: Constraining the accretion disc inner radius
G. C. Dewangan, P. Tripathi, I. E. Papadakis +1
We present a study of far and near-ultraviolet emission from the accretion disk in a powerful Seyfert 1 galaxy IC4329A using observations performed with the Ultraviolet Imaging Tel…
Spectro-Timing Analysis of a highly variable narrow-line Seyfert 1 galaxy NGC 4748 with AstroSat and XMM-Newton
Main Pal, Neeraj Kumari, Pankaj Kushwaha +8
We present a detailed timing and spectral study of an extremely variable narrow-line Seyfert~1 galaxy NGC 4748 using observations in the year 2017 and 2014 performed with AstroSat…
AstroSat Observation of 2016 Outburst of H 1743-322
Swadesh Chand, V. K. Agrawal, G. C. Dewangan +2
We present the detection of type C quasi-periodic oscillation (QPO) along with upper harmonic at respective frequencies of Hz and Hz in the single AstroSat obse…
2016 outburst of H~1743--322: \textit{XMM-Newton} and \textit{NuSTAR} view
Swadesh Chand, V. K. Agrawal, G. C. Dewangan +2
We report the detection of type C QPO along with the upper harmonic in the commensurate ratio of 1:2 in the two observations of the low-mass black hole transient H~1743--322 jointl…