Migrators’ contribution to the disc heating. First row: radial profiles of the vertical velocity dispersion, σz(r), for non-migrators (dashed black curve), outward going migrators (solid brown curve), and inward migrators (dash-dotted green curve) for the gSb model, estimated in the time periods indicated in the top row of each column. Second row: σz(r) estimated for non-migrators (dashed black curve), all migrators (i.e., inward and outward going, solid green curve), and the total population (dashed-dotted blue curve). Third and Fourth rows: same as the first and second rows, respectively, but for the radial velocity dispersion profile σr(r). An unexpected result is that outward migrators cool the disc inside the bar’s OLR (and inward ones heat it), unlike in the case of σz. Some increase in σz and σr from migrators is seen beyond the OLR, while the inner disc is cooled both radially and vertically. Figure 6 quantifies better the migrators’ contribution to σz and σr.
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