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Table 2

Dust model abundances and size distribution parameters (see Sect. 2.1 for details).

Small grains (DHGL)
ρ σ a0 Y κ250μm β

(g/cm3) (nm) (Mdust/MH) (cm2/g)
PAH 2.24 0.40 0.64 7.80 × 10-4 0.001
SamC 1.81 0.35 2.00 1.65 × 10-4 0.002 1.55

Big grains (DHGL)
ρ α ac, at Y κ250μm β

(nm)
LamC 1.81 –2.8 150.0 1.45 × 10-3 0.014 1.55
aSil 3.5 –3.4 200.0 7.8 × 10-3 0.034 2.11

Accreted grains
ρ α ac, at Y κ250μm β

accC 1.81 –2.8 150.0 1.6 × 10-3 0.015 1.55
accSi 3.22 –3.4 200.0 8.6 × 10-3 0.066 1.52

Aggregates
ρ α ac, at Y κ250μm β

0% 2.87 –2.4 234.0 1.02 × 10-2 0.111 1.33
10% 2.59 –2.4 242.0 1.02 × 10-2 0.140 1.32
25% 2.16 –2.4 256.0 1.02 × 10-2 0.208 1.30
40% 1.72 –2.4 276.0 1.02 × 10-2 0.331 1.27

Notes. ρ is the grain mass density, Y is the mass abundance per H, κ250μm is the opacity at 250 μm, and β is the intrinsic opacity spectral index for λ > 100μm for each dust population. For aggregates, the percentages give their degree of porosity (see Sect. 4.2 for details).

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