Thermal and spinning dust modelling results. Left: dust SEDs for media illuminated by the ISRF with G₀ = 1. The dashed and solid lines show media with gas local densities of 30 H cm^–3 and 0.1 H cm^–3, respectively. The black star shows the average AME emissivity at 30 GHz for the bulk of pixels included in the 50% contour in Fig. 5, to avoid pixels with the highest and lowest densities and radiation fields. The upper panel shows spinning nano-carbon grains, and the bottom panel presents spinning nano-silicates with case 1 in black, case 2 in magenta, case 3 in blue, and case 4 in green; see Sect. 3.1 for details. Right: spinning nano-dust emission at 30 GHz vs. thermal nano-dust emission at 12 μm for N_HI = 10²⁰ H cm^–2. Each panel shows the results obtained for media with densities n_H = 0.1, 0.5, 1, 5, 10, 30, 100, and 1000 H cm^–3 from bottom to top. The radiation fields scaled by G₀ = 0.1, 1, 5, 10, and 20 are shown from left to right. The upper panel displays spinning nano-carbons. The lower panels show the four cases of spinning nano-silicates described in Sect. 3.1: case 1 in black, case 2 in magenta, case 3 in blue, and case 4 in green. The black star shows the average AME emissivity at 30 GHz vs. the average emissivity at 12 μm, both scaled to N_H = 10²⁰ H cm^–2.