Open Access
Table 4
Summary of H2 excitation in shocks.
| Parameter | Role |
|---|---|
| b | With υs, determines if a shock is J- or C-type |
J-type:  , and the shock is narrow |
|
| C-type: energy is dissipated over large scales, lower Tmax | |
| υs | With nH sets  (ρ = 1.4mHnH) |
| J-type: velocity sets T leading to excitation | |
| C-type: sets T together with nH, spectrum dominated by rotational lines, but intensity increases with υs (Ekin) | |
| nH | J-type: sets intensity (up to the point where H2O and OH take over, or H2 is dissociated) |
| C-type: sets intensity, and at the highest nH (≥106 cm−3) also excitation | |
| G0 | J-type: little to no effect, except at lowest υs where intensity increases |
| C-type: Changes excitation when EUV ≳ Ekin | |
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