The Galaxy in Context: Structural, Kinematic, and Integrated Properties

Joss Bland‐Hawthorn, Ortwin Gerhard

Annual Review of Astronomy and Astrophysics · 2016 · 1.6K citations · 558 references

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Concepts

TL;DR

The Milky Way is a benchmark disk galaxy whose full stellar distribution provides unique insight into galaxy formation and evolution; it is a luminous barred spiral with a central box/peanut bulge, dominant disk, diffuse halo, and lies in the sparsely populated green‑valley of the colour‑magnitude diagram. The authors review the Galaxy’s integrated, structural, and kinematic parameters and highlight uncertainties and future research directions. The review compiles key integrated, structural, and kinematic measurements of the Milky Way.

Abstract

Our Galaxy, the Milky Way, is a benchmark for understanding disk galaxies. It is the only galaxy whose formation history can be studied using the full distribution of stars from white dwarfs to supergiants. The oldest components provide us with unique insight into how galaxies form and evolve over billions of years. The Galaxy is a luminous (L-star) barred spiral with a central box/peanut bulge, a dominant disk, and a diffuse stellar halo. Based on global properties, it falls in the sparsely populated "green valley" region of the galaxy colour-magnitude diagram. Here we review the key integrated, structural and kinematic parameters of the Galaxy, and point to uncertainties as well as directions for future progress. Galactic studies will continue to play a fundamental role far into the future because there are measurements that can only be made in the near field and much of contemporary astrophysics depends on such observations.

References

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