Table 2
Dust model parameters as input into DustEM.
| Composition | Size | Eg (eV) | ρ (g cm-3) | α | amin/amax | ac, at/a0 | γ/σ | Y | f M − tot |
| core/mantle | distribution | core/mantle | core/mantle | (nm) | (nm) | (M/MH) | |||
|
|
|||||||||
| a-C:H/a-C | p-law | 2.5/0.1 | 1.3/1.6 | 5.0 | 0.4/4900 | 50, 10/− | 1.0/− | 1.6 × 10-3 | 18.6% |
| a-C:H/a-C | log-n | 2.5/0.1 | 1.3/1.6 | − | 0.5/4900 | −, −/7.0 | −/1.0 | 0.6 × 10-3 | 7.0% |
| a-SilFe/a-C | log-n | ~8/0.1 | 2.5/1.6 | 1.0/4900 | −, −/8.0 | −/1.0 | 5.8 × 10-3 | 67.4% | |
| −/a-C | mantle | −/0.1 | −/1.6 | − | d = 5 nm | −, −/− | −/− | 0.6 × 10-3 | 7.0% |
|
|
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| Total | 8.6 × 10-3 | ||||||||
Notes. 1. The elemental abundances for this model are, 233 ppm for C, and 50–67, 22, 45–50 and 180–199 ppm, Mg, Fe, Si and O, respectively. The abundances in boldface type, for Mg and Fe, are for the standard model where the Fe is present in nano-particles, the other values indicate the Mg and Fe abundances when all of the Fe is incorporated into the amorphous silicate phase. 2. d is the a-C mantle depth on the amorphous silicates (5 nm). 3. p-law indicates a power-law distribution, dn/da ∝ a− α, with an exponential tail, D(a) = {exp(−[a − at] /ac)γ } for a > at else D(a) = 1. 4. log-n indicates a logarithmic normal distribution, dn/da ∝ exp(−log [a/a0] 2)/σ.
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