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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.…
First detection of X-ray polarization in thermal state of LMC X-3: Spectro-polarimetric study with IXPE
Seshadri Majumder, Ankur Kushwaha, Santabrata Das +1
We report a comprehensive spectro-polarimetric study of the black hole binary LMC X using simultaneous {\it IXPE}, {\it NICER} and {\it NuSTAR} observations in 0.520 keV ene…
Spectro-polarimetry of 4U 1957+115 with IXPE: Effects of spin and returning radiation on polarised emission of black hole in thermal state
Ankur Kushwaha, Kiran M. Jayasurya, Anuj Nandi
We present a comprehensive spectro-polarimetric study of persistent Black hole X-ray binary 4U with {\it IXPE} and {\it NICER} observations. The source is observed i…
Unveiling the accretion scenario of BH-ULXs using XMM-Newton observations
Seshadri Majumder, Santabrata Das, Vivek. K. Agrawal +1
We present a comprehensive spectro-temporal analysis of five ultraluminous X-ray sources (ULXs) with central object likely being a black hole, using archival {\it XMM-Newton} obser…
Wideband Study of the Brightest Black Hole X-ray Binary 4U 1543-47 in the 2021 Outburst: Signature of Disk-Wind Regulated Accretion
Geethu Prabhakar, Samir Mandal, Bhuvana G. R. +1
A comprehensive wideband spectral analysis of the brightest black hole X-ray binary 4U during its 2021 outburst is carried out for the first time using NICER, NuSTAR, and…