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

Ingram, Adam; Wu, Kinwah; Enoto, Teruaki +111 more

A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a polarimetric observation of the XRB Cygnus X-1 using the Imaging X-ray Polarimetry Explorer. The electric field position angle aligns with the outflowing jet, indicating t…