Polarized X-Rays from Windy Accretion in Cygnus X-1
Polarized X-Rays from Windy Accretion in Cygnus X-1
Abstract Recent X-ray polarimetric data on the prototypical black hole X-ray binary Cyg X-1 from the Imaging X-ray Polarimetry Explorer present tight constraints on accretion geometry in the hard spectral state. Contrary to general expectations of a low, ≲1% polarization degree (PD), the observed average PD was found to be …