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• W3123882605 startingPage "1586" @default.
• W3123882605 abstract "ABSTRACT We develop a novel method to simultaneously determine the vertical potential, force, and stellar z−vz phase space distribution function (DF) in our local patch of the Galaxy. We assume that the Solar Neighbourhood can be treated as a one-dimensional (1D) system in dynamical equilibrium and directly fit the number density in the z−vz plane to what we call the rational linear distribution function (RLDF) model. This model can be regarded as a continuous sum of isothermal DFs though it has only one more parameter than the isothermal model. We apply our method to a sample of giant stars from Gaia Data Release 2 and show that the RLDF provides an excellent fit to the data. The well-known phase space spiral emerges in the residual map of the z−vz plane. We use the best-fitting potential to plot the residuals in terms of the frequency and angle of vertical oscillations and show that the spiral maps into a straight line. From its slope, we estimate that the phase spirals were generated by a perturbation ∼540 Myr years ago. We also determine the differential surface density as a function of vertical velocity dispersion, a.k.a. the vertical temperature distribution. The result is qualitatively similar to what was previously found for SDSS/SEGUE G dwarfs. Finally, we address parameter degeneracies and the validity of the 1D approximation. Particularly, the mid-plane density derived from a cold sub-sample, where the 1D approximation is more secure, is closer to literature values than that derived from the sample as a whole." @default.
• W3123882605 created "2021-02-01" @default.
• W3123882605 creator A5018623269 @default.
• W3123882605 creator A5024083506 @default.
• W3123882605 date "2021-03-01" @default.
• W3123882605 modified "2023-09-23" @default.
• W3123882605 title "The stellar distribution function and local vertical potential from <i>Gaia</i> DR2" @default.
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• W3123882605 doi "https://doi.org/10.1093/mnras/stab574" @default.
• W3123882605 hasPublicationYear "2021" @default.
• W3123882605 type Work @default.
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