Accretion geometry of the neutron star low mass X-ray binary Cyg X-2 from X-ray polarization measurements
Accretion geometry of the neutron star low mass X-ray binary Cyg X-2 from X-ray polarization measurements
ABSTRACT We report spectro-polarimetric results of an observational campaign of the bright neutron star low-mass X-ray binary Cyg X-2 simultaneously observed by IXPE, NICER, and INTEGRAL. Consistently with previous results, the broad-band spectrum is characterized by a lower-energy component, attributed to the accretion disc with kTin ≈ 1 keV, plus …