54 citations · 140 across the 11 of their papers we have counts for
11 papers
Bridging X-ray Polarization with Timing & Spectroscopic Parameters of a galactic black hole: Swift J1727.8-1613
Arka Chatterjee, Sujoy K. Nath, Kaushik Chatterjee +5
We report the discovery of a correlated energy-dependent time lag and degree of polarization for Swift J1727.8-1613 during its 2023 outburst. The energy-dependent time lag is measu…
Time-Lag properties associated with LFQPO in X-ray variability classes of GRS 1915+105: Findings from AstroSat
Prajjwal Majumder, Broja G. Dutta, Anuj Nandi
We present a comprehensive analysis of Low Frequency Quasi-periodic Oscillation (LFQPO) associated time-lags in the persistently variable black hole binary GRS 1915+105 using 441 k…
Decoding the Origin of HFQPOs of GRS 1915+105 during 'Canonical' Soft States: An In-depth View using Multi-mission observations
Prajjwal Majumder, Broja G. Dutta, Anuj Nandi
We present a comprehensive analysis of the 'canonical' soft state (, , and spectral variability classes) of the black hole binary GRS 1915+105, using RXTE, AstroSat, and…
First detection of Soft-lag in GRS 1915+105 at HFQPO using AstroSat observations
Prajjwal Majumder, Broja G. Dutta, Anuj Nandi
The Galactic black hole GRS 1915+105 exhibits generic High-Frequency Quasi-periodic Oscillations (HFQPOs) at 67 Hz only during the radio-quiet 'softer' variability classes.…
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…
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…
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…
Evolution of Accretion Disc Geometry of GRS~1915+105 during its state as revealed by TCAF solution
Broja G Dutta, Partha Sarathi Pal, Sandip K Chakrabarti
The evolution of the C-type low frequency quasi-periodic oscillations (LFQPOs) and associated time lag in transient black hole sources as a function of time can be explained by var…
Temporal variability from the two-component advective flow solution and its observational evidence
Broja G. Dutta, Sandip K. Chakrabarti
In the propagating oscillatory shock model, the oscillation of the post-shock region, i.e., the Compton cloud, causes the observed low-frequency quasi-periodic oscillations (QPOs).…
Accretion flow behaviour during the evolution of the Quasi Periodic Oscillation Frequency of XTE J1550-564 in 1998 outburst
Sandip K. Chakrabarti, Broja G. Dutta, P. S. Pal
Low and intermediate frequency quasi-periodic oscillations (QPOs) are thought to be due to oscillations of Comptonizing regions or hot regions embedded in Keplerian discs. Observat…