The observed spiral structure of the Milky Way
Li‐Peng HouNational Astronomical Observatories, Chinese Academy of Sciences, Jia-20, DaTun Road, ChaoYang District, 100012 Beijing PR ChinaJ. L. HanNational Astronomical Observatories, Chinese Academy of Sciences, Jia-20, DaTun Road, ChaoYang District, 100012 Beijing PR China
2014en
ABI
Abstract
Context. The spiral structure of the Milky Way is not yet well determined. The keys to understanding this structure are to increase the number of reliable spiral tracers and to determine their distances as accurately as possible. HII regions, giant molecular clouds (GMCs), and 6.7 GHz methanol masers are closely related to high mass star formation, and hence they are excellent spiral tracers. The distances for many of them have been determined in the literature with trigonometric, photometric, and/or kinematic methods.
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