Table 5
Comparison between the observed and RADEX model(a) predicted HeH+ line fluxes.
| HeH+ Lines (υ′, J′) → (υ, J) | Rest wavelength (μm) | Upper state energy / kB (K) | Observed line flux (10−18 Wm−2) | Predicted line flux (by RADEX)(*) (10−18 Wm−2) | Ratio (observed / Predicted) |
|---|---|---|---|---|---|
| (0,1 → 0,0) | 149.091 | 96.5 | 163 ± 32 | 33.49 [70.43] | 4.87 ± 0.956 [2.31 ± 0.454] |
| (1,0 → 0,1)[P(1)] | 3.51532 | 4188.3 | 1.55 ± 0.16 | 0.57 [1.19] | 2.74 ± 0.282 [1.30 ± 0.134] |
| (1,1 → 0,2) [P(2)] | 3.60677 | 4276.9 | 2.08 ± 0.31 | 0.63 [1.33] | 3.31 ± 0.493 [1.57 ± 0.234] |
Notes. (*)RADEX line flux is given erg s−1 cm−2. To compare with the observed flux, we convert the RADEX flux unit to W m−2 and accounting for the observational angular sizes (see notes in Table 3).(a) CLOUDY parameters: Tkin = 10 380 K, n(e) = 4.63 × 104 cm−3, n(H) = 4.77 × 104 cm−3, N[HeH+] = 9.67 × 1011 cm−2, line width = 30 km s−1. The predicted line fluxes and their ratio with observation considering the larger column density of 2.04 × 1012 cm−2 are reported in square brackets.
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