Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space

  title={Identifying resonances of the Galactic bar in Gaia DR2: II. Clues from angle space},
  author={Wilma H. Trick},
  journal={Monthly Notices of the Royal Astronomical Society},
  • W. Trick
  • Published 2 November 2020
  • Physics
  • Monthly Notices of the Royal Astronomical Society
The Milky Way disk exhibits intricate orbit substructure of still-debated dynamical origin. The angle variables (θφ, θR)—which are conjugates to the actions (Lz, JR), and describe a star’s location along its orbit—are a powerful diagnostic to identify l:m resonances via the orbit shape relation ΔθR/Δθφ = −m/l. In the past, angle signatures have been hidden by survey selection effects (SEs). Using test particle simulations of a barred galaxy, we demonstrate that Gaia should allow us to… 
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