12 papers
Model dependence of XRISM black-hole spin constraints in Cyg X-1
Andrzej A. Zdziarski, Swadesh Chand, Michal Szanecki +2
We study the persistent black hole X-ray binary Cyg X-1, recently observed by XRISM Resolve and simultaneously by NICER and NuSTAR in its hard spectral state. We confirm the result…
On the assessment of the disk truncation and detection of type-II bursts from the accreting millisecond X-ray Pulsar IGR J17062-6143
Aditya Sow Mondal, Mahasweta Bhattacharya, Swarnendu Jana +2
We present a spectral analysis of the NuSTAR and NICER observations of the accreting millisecond X-ray pulsar IGR J17062-6143, performed in 2022. The source remained in the hard sp…
Probing the accretion geometry of the transient accreting millisecond pulsar SAX J1808.4-3658: transitions to the propeller regime
Mahasweta Bhattacharya, Aditya S. Mondal, Gulab C. Dewangan
We analyze three NuSTAR observations and two NICER observations of the transient accreting millisecond pulsar SAX J1808.4-3658 in the hard spectral state during its most recent out…
X-ray spectral and temporal evolution of atoll source 4U 1820-30 with AstroSat: detection of high frequency quasi-periodic oscillation
Subhasish Das, Vivek Kumar Agrawal, Parijat Thakur +4
AstroSat/LAXPC and SXT observed the persistent neutron star low-mass X-ray binary 4U 1820-30 between 2016 and 2022. During these observations, the hardness-intensity diagram (HID)…
Understanding coronal geometry in NGC 4593 using Fourier frequency-resolved covariance and time-lag spectral analysis
Shree Suman, Mayukh Pahari, Gulab Dewangan +1
Understanding disc-corona geometry through X-ray reverberation variability studies in Seyfert galaxies is crucial, yet our knowledge mostly relies on flux-averaged mean spectral an…
Evolution of the Inner Accretion Flow in Swift J1727.81613 across Intermediate States: Insights from Broadband Spectral and Timing Analysis
Swadesh Chand, Andrzej A. Zdziarski, Gulab C. Dewangan +1
We present a comprehensive broadband spectral and variability study of the newly detected black hole X-ray binary Swift~J1727.8--1613 in the intermediate states during its 2023 out…