Abstract
The distance to the relativistic jet source SS 433 and the related supernova remnant W50 is reexamined using new observations of H I in absorption from the Very Large Array, H I in emission from the Green Bank Telescope, and 12 CO emission from the Five College Radio Astronomy Observatory. The new measurements show HI in absorption against SS 433 to a velocity of 75 km s −1 but not to the velocity of the tangent point, which bounds the kinematic distance at 5.5 dk < 6.5 kpc. This is entirely consistent with a 5.5 ± 0.2 kpc distance determined from light traveltime arguments by Blundell & Bowler. The H I emission map shows evidence of interaction of the lobes of W50 with the interstellar medium near the adopted systemic velocity of VLSR = 75 km s −1 . The western lobe sits in a cavity in the H I emission near the Galactic plane, while the eastern lobe terminates at an expanding H I shell. The expanding shell has a
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