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Table 4
MUSCLE input parameters.
| Parameter | Value |
|---|---|
| Radiation field: | |
| CR ionization rate ζCR | 1.8(− 16) s−1 (a) |
| Extinction Av at rout | 10mag |
| UV photodesorption yield | 1(−05) (b,c) |
| Grain properties: | |
| Grain radius rg | 0.1 μm (d) |
| Dust density ρd | 3 g cm−3 (d) |
| Gas-to-dust mass ratio η | 150 (e) |
| Surface diffusivity EDiff/EBind | 0.4 (f) |
| Mantle composition | Olivine (d) |
| Initial Chemical Abundances | |
| HMPO model | Best-fit IRDC stage (g) |
| Inner radius rin | 12 700 au |
| Outer radius rout | 0.5 pc |
| Temperature Tin at rin | 11.3 K |
| Temperature power-law index q | 0.0 (isothermal) |
| Density nin at rin | 1.4(5) cm−3 |
| Density power-law index p | 1.5 |
| Stage lifetime τIRDC | 16 500 yr |
| HMC model | Best-fit HMPO stage (g) |
| Inner radius rin | 103 au |
| Outer radius rout | 0.5 pc |
| Temperature Tin at rin | 75.8 K |
| Temperature power-law index q | 0.4 |
| Density nin at rin | 1.5(9) cm−3 |
| Density power-law index p | 1.8 |
| Stage lifetime τHMPO | 32 000 yr |
| UCHII model | Best-fit HMC stage (g) |
| Inner radius rin | 1 140 au |
| Outer radius rout | 0.5 pc |
| Temperature Tin at rin | 162.9 K |
| Temperature power-law index q | 0.4 |
| Density nin at rin | 1.3(8) cm−3 |
| Density power-law index p | 2.0 |
| Stage lifetime τHMC | 35 000 yr |
Notes. a(b) = a × 10b.
References.(a)Indriolo et al. (2015); (b)Cruz-Diaz et al. (2016); (c)Bertin et al. (2016); (d)Gerin (2013); (e) Draine (2011); (f) Cuppen et al. (2017); (g)Tables A.4–A.6 in Gerner et al. (2015).
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