534 citations · 6k across the 115 of their papers we have counts for
117 papers
X-ray polarization in the soft state of Cyg X-1
A. Niedzwiecki, M. Szanecki, A. Veledina +5
We aim to identify the physical mechanism responsible for the observed X-ray emission and polarization of Cyg X-1 in the soft state. We performed a detailed spectral analysis of X-…
Broad band spectral modeling of M87 nucleus
Andrzej Niedzwiecki, Michal Szanecki, Agnieszka Janiuk
We study spectra produced by weakly accreting black hole (BH) systems using the semi-analytic advection dominated accretion flow (ADAF) model and the general-relativistic magentohy…
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…
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…
Lamp-post with an outflow and the hard state of Cyg X-1
Lukasz Klepczarek, Andrzej Niedzwiecki, Michal Szanecki
Relativistic reflection observed in the hard states of accreting black holes often shows a weak amplitude relative to the main Comptonization component, which may result from eithe…
Hot accretion flows in low-luminosity active galactic nuclei in NGC 4258 and NGC 7213
Michal Szanecki, Andrzej Niedzwiecki, Rafal Wojaczynski
We study the high energy emission of two active galactic nuclei (AGN), NGC 4258 and NGC 7213. We directly apply the general-relativistic (GR) hot flow model, kerrflow, to the archi…