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A black hole x-ray binary (XRB) system forms when gas is stripped from anormal star and accretes onto a black hole, which heats the gas sufficiently toemit x-rays. We report a polarimetric observation of the XRB Cygnus X-1 usingthe Imaging x-ray Polarimetry Explorer. The electric field position anglealigns with the outflowing jet, indicating that the jet is launched from theinner x-ray emitting region. The polarization degree is (4.01+-0.20)% at 2 to 8kiloelectronvolts, implying that the accretion disk is viewed closer to edge-onthan the binary orbit. The observations reveal that hot x-ray emitting plasmais spatially extended in a plane perpendicular to the jet axis, not parallel tothe jet.

Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1