13 citations · 56 across the 11 of their papers we have counts for
11 papers
First X-ray polarimetric view of a Low-Luminosity Active Galactic Nucleus: the case of NGC 2110
Sudip Chakraborty, Ajay Ratheesh, Daniele Tagliacozzo +20
Low-Luminosity Active Galactic Nuclei (LLAGN) provides a unique view of Comptonization and non-thermal emission from accreting black holes in the low-accretion rate regime. However…
Ultraviolet spectroscopy of the black hole X-ray binary MAXI J1820+070 across a state transition
Maria Georganti, Christian Knigge, Noel Castro Segura +8
We present ultraviolet (UV) spectroscopic observations covering three distinct accretion states of the low-mass X-ray binary (LMXB) MAXI J1820+070: the luminous hard state, a hard-…
Is the Spin of the Black Hole in GX 339-4 Negative?
Andrzej A. Zdziarski, Srimanta Banerjee, Michal Szanecki +2
We have studied the accreting black hole binary GX 339--4 using two highly accurate broad-band X-ray data sets in very soft spectral states from simultaneous NICER and NuSTAR obser…
A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
Srimanta Banerjee, Gulab C. Dewangan, Christian Knigge +8
We present a comprehensive multi-wavelength spectral analysis of the black hole X-ray binary MAXI J1820+070 during its 2018 outburst, utilizing AstroSat far UV, soft and hard X-ray…
What Is the Black Hole Spin in Cyg X-1?
Andrzej A. Zdziarski, Swadesh Chand, Srimanta Banerjee +6
We perform a detailed study of the black hole spin of Cyg X-1, using accurate broad-band X-ray data obtained in the soft spectral state by simultaneous NICER and NuSTAR observation…
Probing the accretion geometry of the atoll source 4U 1702-429 in different spectral states with NICER, NuSTAR, and AstroSat
Srimanta Banerjee, Jeroen Homan
We perform a comprehensive spectral study of a carefully selected sample (total exposure ks) of NICER observations of the atoll neutron star low-mass X-ray binary 4U 17…
Universality of coronal properties in accreting black holes across mass and accretion rate
Sudip Chakraborty, Ajay Ratheesh, Francesco Tombesi +2
Through their radio loudness, lack of thermal UV emission from the accretion disk and power-law dominated spectra, Low Luminosity AGN (LLAGN) display similarity with the hard state…
Black hole spin measurements in LMC X-1 and Cyg X-1 are highly model-dependent
Andrzej A. Zdziarski, Srimanta Banerjee, Swadesh Chand +4
The black-hole spin parameter, , was measured to be close to its maximum value of 1 in many accreting X-ray binaries. In particular, was found in a number of…
Observing imprints of black hole event horizon on X-ray spectra
Srimanta Banerjee, Marat Gilfanov, Sudip Bhattacharyya +1
A fundamental difference between a neutron star (NS) and a black hole (BH) is the absence of a physical surface in the latter. For this reason, any remaining kinetic energy of the…
Alignment and precession of a black hole misaligned with its accretion disc: Application to Low Mass X-ray Binaries
Srimanta Banerjee, Chandrachur Chakraborty, Sudip Bhattacharyya
A thin viscous accretion disc around a Kerr black hole, which is warped due to the Lense-Thirring (LT) effect, was shown to cause the spin axis of the black hole to precess and ali…
A study of a tilted thin inner accretion disk around a spinning black hole
Srimanta Banerjee, Chandrachur Chakraborty, Sudip Bhattacharyya
The inner part of a thin accretion disk around a Kerr black hole can serve as an important tool to study the physics of the strong gravity regime. A tilt in such a disk with respec…