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

TL;DR

This paper presents a three-dimensional map of the Milky Way galaxy based on the positions and distances of thousands of classical Cepheid variable stars, revealing the galaxy's structure and disk warp.

Contribution

It introduces a new 3D map of the Milky Way using Cepheid variables, providing direct distance measurements and insights into galactic structure.

Findings

Reveals the warped shape of the Milky Way's disk

Maps the distribution of young stellar populations

Supports a star formation model in spiral arms

Abstract

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.