A revised steady-state radial-velocity response model with both V_R,sin and V_R,cos terms constrains the Milky Way's two-armed spiral to a pitch angle of ~10° and local density contrast of 5-18% at the solar radius.
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Tracing the kinematic perturbations of the Milky Way spiral arms with APOGEE DR17 and Gaia DR3
A revised steady-state radial-velocity response model with both V_R,sin and V_R,cos terms constrains the Milky Way's two-armed spiral to a pitch angle of ~10° and local density contrast of 5-18% at the solar radius.