High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component

Tanmoy Chattopadhyay, Abhay Kumar, A. R. Rao +7

Cygnus X-1, the well-known accreting black hole system, exhibits several observational features hinting at an intricate interplay between the accretion disk, its atmosphere known a…