Parameters of the Galactic density-wave spiral structure: Line-of-sight velocities of 156 star-forming regions
New Astronomy(2015)
Abstract
•The line-of-sight velocities of HII regions in the solar vicinity are studied.•The minor effects caused by the Lin–Shu density waves are taken into account.•Several spiral patterns with different number of arms m may coexist in the Galaxy.•The Sun lies between the main trailing spirals in Sagittarius and Perseus.•The single-armed m=1 spiral mode dominates the pattern.
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Key words
Galaxy: Kinematics and dynamics,Galaxy: structure,Galaxies: spiral
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