72 citations · 706 across the 49 of their papers we have counts for
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Broadband study of the SMC pulsar RX J0032.9-7348 during its X-ray brightening in 2024
Birendra Chhotaray, Gaurava K. Jaisawal, Sachindra Naik +1
We present the results of the broadband timing and spectral analysis of the poorly understood SMC pulsar RX J0032.9-7348 (= SXP 7.02) using NuSTAR and NICER observations during its…
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…
NGC 7314: X-ray Study of the Evolving Accretion Properties
Debjit Chatterjee, Arghajit Jana, A. Mangalam +1
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…
Accretion properties of soft X-ray transient XTE J1856+053 during its 2023 Outburst
Debjit Chatterjee, Arghajit Jana, Hsiang-Kuang Chang
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 fain…
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…
Spectral Properties of GX~339--4 in the Intermediate State Using AstroSat Observation
Arghajit Jana, Debjit Chatterjee, Hsiang-Kuang Chang +2
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 sourc…
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…
Accretion Properties and Estimation of Spin of Galactic Black Hole Candidate Swift J1728.9-3613 with NuSTAR during its 2019 outburst
Skye R. Heiland, Arka Chatterjee, Samar Safi-Harb +2
Black hole X-ray binaries (BHXRBs) play a crucial role in understanding the accretion of matter onto a black hole. Here, we focus on exploring the transient BHXRB \source~discovere…
X-ray Polarization changes with the State Transition in Cygnus X--1
Arghajit Jana, Hsiang-Kuang Chang
We studied the polarization properties of Cygnus X-1 in both hard and soft spectral states with Imaging X-ray Polarimetry Explorer (IXPE) observations. The polarization degree is $…
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…
Evolution of low frequency quasi-periodic oscillations in GX 339-4 during its 2021 outburst using AstroSat data
Santanu Mondal, Anirudh Salgundi, Debjit Chatterjee +3
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…
Optical and X-ray studies of Be/X-ray binary 1A 0535+262 during its 2020 giant outburst
Birendra Chhotaray, Gaurava K. Jaisawal, Neeraj Kumari +3
We report results obtained from the optical and X-ray studies of the Be/X-ray binary 1A 0535+262/HD 245770 during the 2020 October giant X-ray outburst, using the 1.2 m telescope a…
Global Accretion Properties of Black Hole X-Ray Binaries: A Phenomenological Perspective
Arghajit Jana
Black hole X-ray binaries (BHXBs) show rich phenomenology in the spectral and timing properties. We collected the spectral data of 20 BHXBs from the literature across different spe…
Properties of MAXI J1348-630 during Its Second Outburst in 2019
Riya Bhowmick, Dipak Debnath, Kaushik Chatterjee +2
The newly discovered galactic black hole candidate (BHC) MAXI~J1348-630 showed two major outbursts in 2019, just after its discovery. Here, we provide a detailed spectral and tempo…
Broadband X-ray Spectroscopy and Estimation of Spin of the Galactic Black Hole Candidate GRS 1758-258
Arghajit Jana, Hsiang-Kuang Chang, Arka Chatterjee +2
We present the results of a broadband (0.5-78 keV) X-ray spectral study of the persistent Galactic black hole X-ray binary GRS 1758-258 observed simultaneously by Swift and NuSTAR.…
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…
AstroSat Observation of X-ray Dips and State Transition in the Black Hole Candidate MAXI J1803-298
Arghajit Jana, Sachindra Naik, Gaurava K. Jaisawal +3
We present the results obtained from broadband X-ray timing and spectral analysis of black hole candidate MAXI J1803-298 using an AstroSat observation on May 11-12, 2021. Four peri…
Evidence of Heavy Obscuration in the Low-Luminosity AGN NGC 4941
Arghajit Jana, Sachindra Naik, Neeraj Kumari
We present the results obtained from timing and spectral studies of the highly obscured low luminosity active galactic nucleus NGC~4941 using data obtained from the {\it Nuclear Sp…
NuSTAR and Swift Observations of the Extragalactic Black Hole X-ray Binaries
Arghajit Jana, Sachindra Naik, Debjit Chatterjee +1
We present the results obtained from detailed spectral and timing studies of extra-galactic black hole X-ray binaries LMC~X--1 and LMC~X--3, using simultaneous observations with {\…
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…
Accretion Flow Properties of MAXI J1910-057/Swift J1910.2-0546 During Its 2012-13 Outburst
Sujoy Kumar Nath, Dipak Debnath, Kaushik Chatterjee +3
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 the d…
Complex optical/UV and X-ray variability in Seyfert 1 galaxy Mrk 509
Neeraj Kumari, Main Pal, Sachindra Naik +3
We performed a detailed spectral and timing analysis of a Seyfert 1 galaxy Mrk 509 using data from the Neil Gehrels Swift observatory that spanned over ~13 years between 2006 and 2…
NICER observations of the black hole candidate MAXI J0637430 during the 2019-2020 Outburst
Arghajit Jana, Gaurava K. Jaisawal, Sachindra Naik +5
We present detailed timing and spectral studies of the black hole candidate MAXI J0637430 during its 2019-2020 outburst using observations with the {\em Neutron Star Interior Co…
Accretion Properties of MAXI J1813-095 during its Failed Outburst in 2018
Arghajit Jana, Gaurava K. Jaisawal, Sachindra Naik +7
We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI~J1813-095 using {\it Swift}, {\it NICER}, and {\it NuSTAR} observations dur…