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Investigating the Anti-Correlation between Photon Index and Flux of the Crab using RXTE and NuSTAR
Debjit Chatterjee, Hsiang-Kuang Chang, Dipak Debnath +2
We present a systematic study of the recently reported anti-correlation between X-ray flux and photon index () in the Crab Nebula, using archival RXTE/PCA (3 - 50 keV), RXTE/HEX…
Evolution of QPO During Discovery Outburst of MAXI J1834-021: Estimation of Intrinsic Parameters from Spectro-Temporal Study
Dipak Debnath, Hsiang-Kuang Chang
The Galactic transient black hole candidate (BHC) MAXI~J1834-021 was detected for the first time by MAXI/GSC on February 05, 2023 and it was active for next ~months. A mon…
Distinct Fe-K Line Complexes in MAXI J1744-294 Revealed by XRISM High-Resolution Spectroscopy
Kaushik Chatterjee, Santanu Mondal, Biswaraj Palit +7
The newly discovered Galactic transient MAXI J1744-294 went into its first X-ray outburst in 2025. We study the spectral properties of this source in the 2-10 keV energy band durin…
Detection of X-ray Polarization in the Hard State of IGR J17091-3624: Spectro-Polarimetric Study with IXPE and NuSTAR Data
Dipak Debnath, Subham Srimani, Hsiang-Kuang Chang
The class-transition Galactic X-ray binary IGR~J17091--3624 was simultaneously monitored by the \textit{IXPE} and \textit{NuSTAR} satellites. We present a detailed spectro-polarime…
Accretion Flow Properties of MAXI J1834-021 During Its Double-Outbursts In 2023
Dipak Debnath, Hsiang-Kuang Chang
The Galactic transient black hole candidate MAXI J1834-021 exhibited `faint' outbursting activity for approximately months following its discovery on February 5, 2023. We stud…
Accretion Flow Properties of Swift J1727.8-1613 and Estimation of the BH Mass
Dipak Debnath, Hsiang-Kuang Chang, Sujoy Kumar Nath +1
The rising phase of the 2023-24 outburst of the recently discovered bright transient black hole candidate Swift J1727.8-1613 was monitored by {\it Insight}-HXMT. We study the evolu…