31 citations · 138 across the 18 of their papers we have counts for
17 papers · 1 filter
Evolution of Accretion Properties in Mrk 1040 using long-term X-ray Observations
Prantik Nandi, Narendranath Layek, Sandip K Chakrabarti +2
We present a comprehensive long-term, multi-epoch spectral and timing study of the Seyfert 1 Active Galactic Nucleus (AGN) Mrk~1040, utilizing X-ray observations spanning from 2009…
Discovery of Changing-Look behavior in AGN NGC 3822: A long-term multiwavelength study
Narendranath Layek, Prantik Nandi, Sachindra Naik +7
We present a comprehensive long-term multi-wavelength study of the active galactic nucleus (AGN) NGC 3822, based on 17 years (2008 to 2025) of X-ray, ultraviolet (UV), and optical…
A long-term study of Mrk 50 : Appearance and disappearance of soft excess
Narendranath Layek, Prantik Nandi, Sachindra Naik +1
We present an extensive temporal and spectral study of the Seyfert 1 AGN Mrk 50 using 15 years (2007-2022) of multiwavelength observations from XMM-Newton, Swift, and NuSTAR for th…
Long-term X-ray temporal and spectral study of a Seyfert galaxy Mrk 6
Narendranath Layek, Prantik Nandi, Sachindra Naik +3
We present a long-term X-ray study of a nearby Active Galactic Nucleus Mrk 6, utilizing observations from XMM-Newton, Suzaku, Swift and NuSTAR observatories, spanning 22 years from…
Long-term study of the first Galactic ultraluminous X-ray source Swift J0243.6+6124 using NICER
Birendra Chhotaray, Gaurava K. Jaisawal, Prantik Nandi +4
We present the results obtained from detailed X-ray timing and spectral studies of X-ray pulsar Swift J0243.6+6124 during its giant and normal X-ray outbursts between 2017 and 2023…
The accretion properties of a low-mass Active Galactic Nucleus: UGC 6728
Prantik Nandi, Sachindra Naik, Arka Chatterjee +3
We present a comprehensive analysis of approximately years () of X-ray observations of UGC~6728, a low-mass bare AGN, for the first time. Our study encompasses both…
Coronal Properties of Low-Accreting AGNs using Swift, XMM-Newton and NuSTAR Observations
Arghajit Jana, Arka Chatterjee, Hsiang-Kuang Chang +6
We studied the broadband X-ray spectra of {\it Swift}/BAT selected low-accreting AGNs using the observations from {\it XMM-Newton}, {\it Swift}, and {\it NuSTAR} in the energy rang…
Investigation of a small X-ray flaring event in NLS1 galaxy NGC 4051
Neeraj Kumari, Arghajit Jana, Sachindra Naik +1
We performed a detailed broadband spectral and timing analysis of a small flaring event of ~120 ks in a narrow-line Seyfert 1 galaxy NGC 4051 using simultaneous XMM-Newton and NuST…
Absorption Variability of the Highly Obscured Active Galactic Nucleus NGC 4507
Arghajit Jana, Claudio Ricci, Sachindra Naik +6
We present a detailed study of the highly obscured active galaxy NGC 4507, performed using four Nuclear Spectroscopic Telescope Array (NuSTAR) observations carried out between May…
Broadband Spectro-temporal Study on Blazar TXS 1700+685
Anuvab Banerjee, Prantik Nandi, Raj Prince +2
We attempt to present a multiwavelength variability and correlation study as well as detailed multi-waveband spectral characteristics of the May 2021 -ray flare of the blazar so…
Broadband X-Ray Observations of the 2018 Outburst of the Changing-Look Active Galactic Nucleus NGC 1566
Arghajit Jana, Neeraj Kumari, Prantik Nandi +5
We study the nature of the changing-look Active Galactic Nucleus NGC 1566 during its June 2018 outburst. During the outburst, the X-ray intensity of the source rises up to ~25-30 t…
Long term X-Ray Observations of Seyfert 1 Galaxy Ark 120: On the origin of soft-excess
Prantik Nandi, Arka Chatterjee, Sandip K. Chakrabarti +1
We present the long-term X-ray spectral and temporal analysis of a 'bare-type AGN' Ark 120. We consider the observations from XMM-Newton, Suzaku, Swift, and NuSTAR from 2003 to 201…
Probing Nuclear and Circumnuclear Properties of NGC 6300 using X-ray Observations
Arghajit Jana, Arka Chatterjee, Neeraj Kumari +3
We present the results obtained from a detailed X-ray timing and spectral analysis of Seyfert 2 galaxy NGC 6300 by using observations with the {\it Suzaku}, {\it Chandra} and {\it…
Time-domain variability properties of XTE J1650-500 during its 2001 outburst: Evidence of disc-jet connection
Arka Chatterjee, Broja G. Dutta, Prantik Nandi +1
Evolution of variability properties of Galactic transient sources is a diagnostic tool to understand various regimes of the accretion flow and its dynamics close to the central bla…
Discovery of Jet-Induced Soft Lags of XTE J1550-564 during Its 1998 Outburst
Arka Chatterjee, Broja G. Dutta, Dusmanta Patra +2
X-ray time lags are complicated in nature. The exact reasons for complex lag spectra are yet to be known. However, the hard lags, in general, are believed to be originated due to t…
Spectral properties of NGC 4151 and the Estimation of black hole mass using TCAF solution
Prantik Nandi, Sandip K. Chakrabarti, Santanu Mondal
We present X-ray spectral analysis of Seyfert 1.5 Active Galactic Nuclei (AGN) NGC~4151 using \textit{NuSTAR} observation during 2012. This is the first attempt to fit an AGN data…
Evidence of Outflow Induced Soft Lags of Galactic Black Holes
Dusmanta Patra, Arka Chatterjee, Broja G. Dutta +2
The nature of lag variation of Galactic black holes remains enigmatic mostly because of nonlinear and non-local physical mechanisms which contribute to the lag of the photons comin…