Recent advances in the determination of some Galactic constants in the Milky Way

Abstract

Here we statistically evaluate recent advances in determining the Sun-Galactic Center distance (\(R_{\mathit{sun}}\)) as well as recent measures of the orbital velocity around the Galactic Center (\(V_{\mathit{lsr}}\)), and the angular rotation parameters of various objects. Recent statistical results point to \(R_{\mathit{sun}} = 8.0 \pm 0.2~\mbox{kpc}\), \(V_{\mathit{lsr}}= 230 \pm 3~\mbox{km}/\mbox{s}\), and angular rotation at the Sun (\(\omega\)) near \(29 \pm 1~\mbox{km}/\mbox{s}/\mbox{kpc}\) for the gas and stars at the Local Standard of Rest, and near \(23 \pm 2~\mbox{km}/\mbox{s}/\mbox{kpc}\) for the spiral pattern itself.

This angular difference is similar to what had been predicted by density wave models, along with the observation that the galactic longitude of each spiral arm tracer (dust, cold CO) for each spiral arm becomes reversed across the Galactic Meridian (Vallée in Astrophys. J. 821:53, 2016b).

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Acknowledgements

The figure production made use of the PGPLOT software at NRC Canada in Victoria. I thank an anonymous referee for useful, careful, and historical suggestions.

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Correspondence to Jacques P. Vallée.

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Vallée, J.P. Recent advances in the determination of some Galactic constants in the Milky Way. Astrophys Space Sci 362, 79 (2017). https://doi.org/10.1007/s10509-017-3058-3

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Keywords

  • Galactic structure
  • Galactic constants
  • Galactic disk
  • Statistics