Table 3
Main parameters defining the best dust model normalised to the Lenz’s ratio and pV/E(B − V) = 13%mag-1 as in Siebenmorgen (2023) and Hensley & Draine (2023).
| Composition core-mantle | a-C | a-C:H/a-C5nm | aSil-2/a-C2.5nm |
|---|---|---|---|
| Shape | Sphere | Prolate | Prolate |
| Elongation | e = 2 | e=2 | |
| Mdust/MH | 1.32 × 10−3 | 8.00 × 10−4 | 3.27 × 10−3 |
| amin (nm) | 0.4 | 45 | 11 |
| amax (nm) | 25 | 700 | 374 |
| α | −5 | … | … |
| ac, at (nm) | 50, 10 | … | … |
| γ | 1 | … | … |
| a0 (nm) | … | 6.2 | 0.92 |
| σ | … | 1.32 | 1.22 |
| athresh (nm) | … | 63 | 63 |
| pstiff | … | 0.22 | 0.22 |
| fmax | … | 0.72 | 0.72 |
Notes. For each dust population, we indicate the grain shape and elongation (e), the dust-to-gas mass ratio (Mdust/MH), the minimum and maximum grain size (amin, amax), the parameters defining the power-law size distribution for small spherical a-C nanograins (∝aα and with an exponential cutoff of the form exp–[(a − at)/aC]γ for a > at), the parameters defining the log-normal size distribution of the bigger spheroidal grains (with a0 the centre radius and σ the width of the distribution) and the three parameters defining the grain alignment function (athresh, pstiff, and ƒmax, see Eq. (5)). The total and polarised SEDs shown by the orange thick lines in Fig. 7 are obtained for G0 = 1.4.
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