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Kinematic Structure of the Milky Way Galaxy, Near the Spiral Arm Tangents

Vallée, Jacques P.

We compare the observed radial velocity of different arm tracers, taken near the tangent to a spiral arm. A slight difference is predicted by the density wave theory, given the shock predicted at the entrance to the inner spiral arm. In many of these spiral arms, the observed velocity offset confirms the prediction of the density wave theory (with…