Explanipedia

Investigating the Anticorrelation between Photon Index and Flux of the Crab Using RXTE and NuSTAR Open

Debjit Chatterjee, Hsiang‐Kuang Chang, Dipak Debnath, Koothodil Abhijith Augustine, Tzu-Hsuan Lin · 2025

We present a systematic study of the recently reported anticorrelation between X-ray flux and photon index (Γ) in the Crab Nebula, using archival Rossi X-Ray Timing Explorer (RXTE) Proportional Counter Array (3–50 keV), RXTE High Energy X-…

Detection of QPO Soft Lag during the Outburst of Swift J1727.8-1613: Estimation of Intrinsic Parameters from Spectral Study Open

Dipak Debnath, Sujoy Kumar Nath, Debjit Chatterjee, Kaushik Chatterjee, Hsiang‐Kuang Chang · 2024

The recently discovered bright transient black hole candidate Swift J1727.8-1613 is studied in a broad energy range (0.5–79 keV) using combined NICER and NuSTAR data taken on 2023 August 29. A prominent type C quasiperiodic oscillation (QP…

NGC 7314: X-Ray Study of the Evolving Accretion Properties Open

Debjit Chatterjee, Arghajit Jana, A. Mangalam, Hsiang‐Kuang Chang · 2024

We present a comprehensive analysis of the timing and spectral properties of NGC 7314, a Seyfert 1.9 galaxy, using X-ray observations from XMM-Newton, NuSTAR, and RXTE/proportional counter array (PCA). The timing analysis reveals significa…

NGC 7314: X-ray Study of the Evolving Accretion Properties Open

Debjit Chatterjee, Arghajit Jana, A. Mangalam, Hsiang‐Kuang Chang · 2024

We present a comprehensive analysis of the timing and spectral properties of NGC 7314, a Seyfert 1.9 galaxy, using X-ray observations from {\it XMM-Newton}, {\it NuSTAR}, and {\it RXTE}/PCA. The timing analysis reveals significant variabil…

Detection of QPO Soft Lag during Outburst of Swift J1727.8-1613: Estimation of Instrinsic Parameters from Spectral Study Open

D. Debnath, Sujoy Kumar Nath, Debjit Chatterjee, Kaushik Chatterjee, Hsiang‐Kuang Chang · 2024

The recently discovered bright transient black hole candidate Swift J1727.8-1613 is studied in a broad energy range ($0.5-79$ keV) using combined NICER and NuSTAR data on 29 August 2023. A promonient type-C Quasi-Periodic Oscillation (QPO)…

Accretion Properties of Soft X-Ray Transient XTE J1856+053 during Its 2023 Outburst Open

Debjit Chatterjee, Arghajit Jana, Hsiang‐Kuang Chang · 2024

Soft X-ray transients (SXTs) are a subclass of the low-mass X-ray binaries that occasionally show a sudden rise in their soft X-ray luminosity; otherwise, they remain in an extremely faint state. We investigate the accretion properties of …

Accretion properties of soft X-ray transient XTE J1856+053 during its 2023 Outburst Open

Debjit Chatterjee, Arghajit Jana, Hsiang‐Kuang Chang · 2024

Soft X-ray transients are a subclass of the low mass X-ray binaries that occasionally show a sudden rise in their soft X-ray luminosity; otherwise, they remain in an extremely faint state. We investigate the accretion properties of the sof…

Spectral properties of GX 339−4 in the intermediate state using AstroSat observation Open

Arghajit Jana, Debjit Chatterjee, Hsiang‐Kuang Chang, Sachindra Naik, Santanu Mondal · 2023

We present the results obtained from the spectral studies of black hole X-ray binary GX 339−4 using AstroSat observations during its 2021 outburst. AstroSat observed the source in the intermediate state for ∼600 ks. The combined spectra of…

Spectral Properties of GX~339--4 in the Intermediate State Using AstroSat Observation Open

Arghajit Jana, Debjit Chatterjee, Hsiang‐Kuang Chang, Sachindra Naik, Santanu Mondal · 2023

We present the results obtained from the spectral studies of black hole X-ray binary GX~339--4 using \astrosat~ observations during its 2021 outburst. \astrosat~ observed the source in the intermediate state for $\sim600$ ks. The combined …

Evolution of low-frequency quasi-periodic oscillations in GX 339-4 during its 2021 outburst using AstroSat data Open

Santanu Mondal, Anirudh Salgundi, Debjit Chatterjee, Arghajit Jana, Hsiang‐Kuang Chang , et al. · 2023

The black hole X-ray binary GX 339-4 showed an X-ray outburst during 2021. The AstroSat captured this outburst when the source entered into the intermediate flux state while the count rate was declining. The source showed an alternating fl…

Evolution of low frequency quasi-periodic oscillations in GX 339-4 during its 2021 outburst using AstroSat data Open

Santanu Mondal, Anirudh Salgundi, Debjit Chatterjee, Arghajit Jana, Hsiang‐Kuang Chang , et al. · 2023

The black hole X-ray binary GX\,339-4 showed an X-ray outburst during 2021. The {\it AstroSat} captured this outburst when the source entered into the intermediate flux state while the count rate was declining. The source showed an alterna…

Accretion flow properties of MAXI J1910-057/Swift J1910.2–0546 during its 2012–13 outburst Open

Sujoy Kumar Nath, Dipak Debnath, Kaushik Chatterjee, Arghajit Jana, Debjit Chatterjee , et al. · 2022

Understanding accretion flow properties of black hole candidates after implementation of the TCAF solution in XSPEC Open

Dipak Debnath, Sandip K. Chakrabarti, Santanu Mondal, Arghajit Jana, Debjit Chatterjee , et al. · 2022

Anomalous nature of outbursts of black hole candidate 4U 1630−472 Open

Kaushik Chatterjee, Dipak Debnath, Riya Bhowmick, Sujoy Kumar Nath, Debjit Chatterjee · 2021

The Galactic black hole candidate (BHC) 4U 1630−472 has gone through several outbursts (13 to be particular) in the last two and a half decades starting from the RXTE era till date. Like the outbursts of other transient BHCs, the outbursts…

NuSTAR and Swift observations of the extragalactic black hole X-ray binaries Open

Arghajit Jana, Sachindra Naik, Debjit Chatterjee, Gaurava K. Jaisawal · 2021

We present the results obtained from detailed spectral and timing studies of extragalactic black hole X-ray binaries LMC X–1 and LMC X–3, using simultaneous observations with Nuclear Spectroscopic Telescope Array (NuSTAR) and Neil Gehrels …

Study of accretion flow dynamics of MAXI J1910-057/Swift J1910.2-0546 during its 2012-13 outburst Open

Sujoy Kumar Nath, Dipak Debnath, Kaushik Chatterjee, Arghajit Jana, Debjit Chatterjee , et al. · 2021

Galactic black hole candidate MAXI J1910-057/Swift J1910.2-0546 was simultaneously discovered by MAXI/GSC and Swift/BAT satellites during its first outburst in 2012. We study detailed spectral and temporal properties of the source in a bro…

Accretion Flow Properties of GRS 1915+105 During Its θ Class Using AstroSat Data Open

Anuvab Banerjee, Ayan Bhattacharjee, Debjit Chatterjee, Dipak Debnath, Sandip K. Chakrabarti , et al. · 2021

The Galactic microquasar GRS 1915+105 shows rich variability that is categorized into different classes. In this paper, we report the temporal and spectral analysis of GRS 1915+105 to study the properties of the accretion flow when the lig…

Accretion flow properties of GRS 1716-249 during its 2016–17 ‘failed’ outburst Open

Kaushik Chatterjee, Dipak Debnath, Debjit Chatterjee, Arghajit Jana, Sujoy Kumar Nath , et al. · 2021

Study of Accretion Flow Dynamics of V404 Cygni during Its 2015 Outburst Open

Arghajit Jana, Jie-Rou Shang, Dipak Debnath, Sandip K. Chakrabarti, Debjit Chatterjee , et al. · 2021

The 2015 Outburst of V404 Cygni is an unusual one with several X-ray and radio flares and rapid variation in the spectral and timing properties. The outburst occurred after 26 years of inactivity of the black hole. We study the accretion f…

Jet properties of XTE J1752−223 during its 2009–2010 outburst Open

Dipak Debnath, Kaushik Chatterjee, Debjit Chatterjee, Arghajit Jana, Sandip K. Chakrabarti · 2021

Galactic short orbital period black hole candidate (BHC) XTE J1752−223 was discovered on 2009 October 21 by the Rossi X-ray Timing Explorer (RXTE). We study the spectral properties of this outburst using transonic flow solution based two c…

Relation between Quiescence and Outbursting Properties of GX 339-4 Open

Riya Bhowmick, Dipak Debnath, Kaushik Chatterjee, Shreeram Nagarkoti, Sandip K. Chakrabarti , et al. · 2021

Galactic black hole candidate GX 339-4 underwent several outbursting phases in the past two and a half decades at irregular intervals of 2–3 years. The nature of these outbursts in terms of the duration, number of peaks, maximum peak inten…

Accretion properties of MAXI J1813-095 during its failed outburst in 2018:Paper Open

Arghajit Jana, Gaurava K. Jaisawal, Sachindra Naik, Neeraj Kumari, Debjit Chatterjee , et al. · 2021

We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI J1813–095 using Swift, NICER, and NuSTAR observations during its 2018 outburst. The timing behavior of the source is mainly studied by…

Accretion flow properties of XTE J1118+480 during its 2005 outburst Open

Dipak Debnath, Debjit Chatterjee, Arghajit Jana, Sandip K. Chakrabarti, Kaushik Chatterjee · 2020

We study spectral and temporal properties of Galactic short orbital period transient black hole XTE J1118+480 during its 2005 outburst using archival data of RXTE PCA and HEXTE instruments in the combined energy range of 3 – 100 keV. Spect…

Study of Accretion Flow Dynamics of V404 Cygni during its 2015 Outburst Open

Arghajit Jana, Jie-Rou Shang, Dipak Debnath, Sandip K. Chakrabarti, Debjit Chatterjee , et al. · 2020

The 2015 Outburst of V404 Cygni is an unusual one with several X-ray and radio flares and rapid variation in the spectral and timing properties. The outburst occurred after $26$ years of inactivity of the black hole. We study the accretion…

Inference on accretion flow properties of XTE J1752-223 during its 2009-10 outburst Open

Kaushik Chatterjee, Dipak Debnath, Debjit Chatterjee, Arghajit Jana, Sandip K. Chakrabarti · 2020

Spectral and timing properties of the stellar-mass black hole candidate XTE J1752-223 during its 2009-10 outburst are studied using RXTE PCA data in the 2.5–25 keV energy range. Low frequency quasi-periodic oscillations are seen during out…

Properties of the Black Hole XTE J1118+480 with the TCAF Solution in 2000 During its Jet activity induced Outburst Open

Debjit Chatterjee, Dipak Debnath, Arghajit Jana, Sandip K. Chakrabarti · 2018

Galactic black hole candidate (BHC) XTE J1118+480 during its 2000 outburst has been studied in a broad energy range using the archival data of PCA and HEXTE payloads of Rossi X-ray Timing Explorer. Detailed spectral and temporal properties…

Accretion Flow Properties of Swift J1753.5-0127 during Its 2005 Outburst Open

Dipak Debnath, Arghajit Jana, Sandip K. Chakrabarti, Debjit Chatterjee, Santanu Mondal · 2017

Galactic X-ray binary black hole candidate Swift J1753.5-0127 was discovered on 2005 June 30 by the Swift /BAT instrument. In this paper, we make a detailed analysis of spectral and timing properties of its 2005 outburst using the archival…

Temporal and spectral properties of MAXI J1659-152 during its 2010 outburst Open

Aslam Ali Molla, Dipak Debnath, Sandip K. Chakrabarti, Santanu Mondal, Arghajit Jana , et al. · 2017

Accretion flow dynamics of a few transient black hole candidates from their spectral evolution study using TCAF solution Open

Dipak Debnath, Sandip K. Chakrabarti, Santanu Mondal, Arghajit Jana, Aslam Ali Molla , et al. · 2017

Possible ASTROSAT observation of transient black hole candidates to study spectral and timing properties with TCAF solution Open

Dipak Debnath, Sandip K. Chakrabarti, Santanu Mondal, Arghajit Jana, Aslam Ali Molla , et al. · 2017

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