Barred-disk model. Distribution of the azimuthal velocity and metallicity after an evolution of 0, 0.1, 0.4 Gyr. Left panels: colour contour plot showing the rotation-metallicity distribution, Vφ vs. [Fe/H], of the particles in the solar annulus, 8 kpc < R < 10 kpc and 1.5 kpc < | z | < 2.0 kpc. The dashed white line indicates the linear fit in the central region of the distribution, including all particles with −0.55 < [Fe/H] < − 0.35 and Vφ > 50 km s-1. Right panels: the colour contour plot represents the distribution of the mean original radius, ⟨ R0 ⟩ , as a function of ([Fe/H],Vφ) of the same particles shown in the left plot. Here, the dotted white lines mark the iso-contours at ⟨ R0 ⟩ = 6 kpc, 8 kpc, 10 kpc, and 12 kpc. The black contours indicate the iso-density levels of the ([Fe/H],Vφ) distribution shown in the left panel.
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