Absorption lines and their origins. (IMAGE)
Caption
During the observation, ionized gas located approximately 10,000 km from the black hole is thought to be distributed above the accretion disk. In addition, where gas falling from the companion star impacts the accretion disk, ionized gas clumps form perpendicular to the disk plane due to the collision. In the latter half of the observation period, these clumps move into alignment with the binary’s orbital motion along our line of sight, increasing the X-ray absorption and resulting in deeper absorption lines.
Credit
JAXA
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