6 papers
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…
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…