3 papers
astro-ph.HE2026
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-…
astro-ph.HE2024
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…
astro-ph.HE2024
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…