Magnetic Fields in GRO J1655-40
This artist's representation shows how magnetic fields may drive a wind in GRO J1655-40. Rotation in the disk plus magnetic actions in the disk can cause magnetic fields, shown here in this simplified version as black lines, to become coiled up like a snake. This can result in gas being driven upwards and away from the disk by pressure created by the magnetic fields, resulting in the wind observed by Chandra (Illustration: NASA/CXC/M Weiss)