2005AJ....130.2701F

A magnitude-limited photographic survey of relative proper-motion components and B, V photometry of 1.3x10⁶ stars brighter than apparent B magnitude 14.5±0.5 in the fourth Galactic quadrant is converted into a distance-limited survey of 3.26x10⁵ stars up to a distance of 500 pc. A streaming motion of 13.5±0.5 km/s is detected in 4.1x10⁴ Population I stellar candidates with an orbital perigalactic center located at 6.8 kpc≤R≤7.2 kpc, with a Sun location R_sol=8.5 kpc. A density perturbation of ∼0.1 M_☉/pc3 in the Galactic field potential at R₀∼6.8 kpc is interpreted as resulting from the density wave connected with the Sagittarius-Carina spiral arm. A set of 1.4x10⁴ stars of mass ∼1.5±0.75 M_☉identify a pitch angle of 10°±1° and a migration time from the Sagittarius spiral arm into the greater solar neighborhood of ∼35 Myr.