Open Access
Table G.1
WL-PDR features
| Feature | details | comments | Ref |
|---|---|---|---|
| model geometry | plane-parallel, semi-infinite | ||
| coolant excitation | non-LTE level population of [O I], [C II], [C I], | LAMDA database format | (1) |
| CO, 13CO, CH, CH+, and HCO+ using an escape probability approach | |||
| Chemistry | time-dependent, returned for tfinal | AccuracyGoal→ | log10(n × 10−10)| | |
| FORTRAN: atol=1e-10*n | |||
| PrecisionGoal→ 10 | |||
| FORTRAN: rtol=1e-18 | |||
| MaxSteps→ 109 | |||
| thermal balance | solved self-consistently with the chemistry iteratively | ||
| Shielding | self-shielding factors for CO | (2) | |
| heating & cooling | H2 processes (pumping, line cooling, formation-and dissociation processes | (3),(4),(5) | |
| gas-grain heating/cooling | (6) | ||
| photoelectric heating and recombination cooling | (7) | ||
| Ly-αcooling | (4) | ||
| optical Oxygen-6300 Åcooling | (4) | ||
| heating by C-ionization and cosmic rays | (5) | ||
| line cooling by [O I], [C II], [C I] (fine structure), CO,13CO, | assuming a thermalized H2 ortho/para ratio | ||
| CH, CH+, and HCO+ (rotational) | |||
| model output | AV grid | ||
| chemical abundances | (cm−3) | ||
| column densities to the edge of the PDR | (cm−2) | ||
| gas and dust temperature | (K) | ||
| heating and cooling rates | (erg s−1 cm−3) | ||
| total heating and cooling rates and sum of them | (erg s−1 cm−3) | ||
| surface brightness of CO, 13CO, CH, | (erg s−1 cm−2 sr−1) | ||
| CH+, HCO+, [O I], [C II], and [C I] |
References. (1) (Schöier et al. 2005); (2) Visser et al. (2009); (3)Röllig et al. (2006); (4) Sternberg & Dalgarno (1989); (5) Jonkheid et al. (2004); (6) Tielens (2005); (7) Bakes & Tielens (1994)
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