(Left) σ _v vs. Σ_mol for the entire (dashed contour) and central 1 kpc region (solid contour) of the G2 and G3 merger at 2.87 Gyr viewed from the “v0” angle. We also show contours for the centers of PHANGS galaxies (brown dashed contours), the Antennae (orange shaded contours), and NGC 3256 (blue solid contours). We can see that the central region in our simulated merger generally has the highest σ _v and α _vir. (Right) Mass-weighted median α _vir for molecular gas in the entire (blue) and central (orange) region of the G2 and G3 merger viewed from the “v0” angle. We see that the α _vir for the entire disk gradually settles back to the original low value, while that for the central region keeps a high value until the end of the simulation.