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Winding, Unwinding, Rewinding the Gaia Phase Spiral

Neige Frankel, Marcin Semczuk, Teresa Antoja, Sukanya Chakrabarti, Rimpei Chiba, Robert Grand, Jason Hunt, Sergey khoperskov, Zhao-Yu Li, Artem Lutsenko, Pau Ramos, Kiyan Tavangar, Lawrence Widrow

Abstract

The Gaia Space Satellite has transformed the field of Galactic Dynamics by collecting 6D phase space information for hundreds of millions of stars. In 2018, it enabled the discovery of the Gaia Phase Spiral (Antoja et al., 2018), a clear signal in the vertical motion of the stars that reveals how far from equilibrium the Galactic disk is. Seven years after the discovery of this structure, a workshop dedicated to the Phase Spiral took place at the Lorentz Center. Workshop participants summarized the current state of knowledge about the Phase Spiral and identified open questions and key areas to continue progressing in understanding the origin of the Phase Spiral and the physics governing the response of the disk to perturbations. Here, we aim to summarize the content and discussions of this workshop, share the resources that have been produced at this workshop with the broader community, and invite interested individuals to join on the projects that started.

Winding, Unwinding, Rewinding the Gaia Phase Spiral

Abstract

The Gaia Space Satellite has transformed the field of Galactic Dynamics by collecting 6D phase space information for hundreds of millions of stars. In 2018, it enabled the discovery of the Gaia Phase Spiral (Antoja et al., 2018), a clear signal in the vertical motion of the stars that reveals how far from equilibrium the Galactic disk is. Seven years after the discovery of this structure, a workshop dedicated to the Phase Spiral took place at the Lorentz Center. Workshop participants summarized the current state of knowledge about the Phase Spiral and identified open questions and key areas to continue progressing in understanding the origin of the Phase Spiral and the physics governing the response of the disk to perturbations. Here, we aim to summarize the content and discussions of this workshop, share the resources that have been produced at this workshop with the broader community, and invite interested individuals to join on the projects that started.
Paper Structure (14 sections, 1 figure, 1 table)

This paper contains 14 sections, 1 figure, 1 table.

Table of Contents

  1. Introduction
  2. Aims Of The Workshop
  3. Discussions & Actions Items
  4. The Origin Of The Phase Spiral
  5. The Physics Of The Phase Spiral
  6. Simulations
  7. From Test Particle To Cosmological Simulations
  8. Deliverable: A Public Simulation Database
  9. Quantifying The Phase Spiral
  10. Measurements Discrepancies
  11. A Systematic Way to Characterize The Spiral
  12. Deliverable: A Public Standardized Sample
  13. Summary & Future Directions
  14. Resources

Figures (1)

  • Figure 1: Phase spiral from antoja_2018, reproduced with permission. Three panels present the distributions of stars in the Solar neighborhood in the $Z-V_Z$ plane, where $Z$ is the height above and below the plane of the Galactic disk and $V_Z$ is the velocity in that direction. Panel a) shows the 2D histogram of stars. Panel b) is colored by the median cylindrical radial velocity $V_R$ and panel c) by the median azimuthal velocity $V_\varphi$.