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A three-dimensional map of the Milky Way using classical Cepheid variable stars

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arxiv 1806.10653 v3 pith:BUSN5IZ2 submitted 2018-06-27 astro-ph.GA astro-ph.SR

A three-dimensional map of the Milky Way using classical Cepheid variable stars

classification astro-ph.GA astro-ph.SR
keywords milkycepheidclassicaldistancesgalaxyspiralstarstracers
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Milky Way is a barred spiral galaxy, with physical properties inferred from various tracers informed by the extrapolation of structures seen in other galaxies. However, the distances of these tracers are measured indirectly and are model-dependent. We constructed a map of the Milky Way in three-dimensions based on the positions and distances of thousands of classical Cepheid variable stars. This map shows the structure of our Galaxy's young stellar population, and allows us to constrain the warped shape of the Milky Way's disk. A simple model of star formation in the spiral arms reproduces the observed distribution of Cepheids.

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