Table 2
Selected H2 emission line properties.
| Progression + pumping transition | Line ID(a) | Wavelength [Å] | Aul [108 s−1] | τlu(b) | comm.(c) |
|---|---|---|---|---|---|
| [1,7] | (1–6)R(6) | 1442.87 | 0.9 | < 10−3 | |
| (1–2)R(6) | (1–6)P(8) | 1467.08 | 1.3 | < 10−4 | |
| λ1215.72 Å | (1–7)R(6) | 1500.45 | 1.7 | < 10−4 | |
| (1–7)P(8) | 1524.65 | 1.9 | < 10−4 | ||
| (1–8)R(6) | 1556.87 | 1.3 | < 10−5 | ||
| (1–8)P(8) | 1580.67 | 1.1 | < 10−5 | ||
| [1,4] | (1–6)R(3) | 1431.01 | 1.0 | < 10−3 | |
| (1–2)P(5) | (1–6)P(5) | 1446.12 | 1.4 | < 10−3 | |
| λ1216.07 Å | (1–7)R(3) | 1489.57 | 1.6 | < 10−3 | |
| (1–7)P(5) | 1504.76 | 2.0 | < 10−3 | ||
| (1–8)R(3) | 1547.34 | 1.1 | < 10−4 | bw C IV | |
| [0,1] | (0–4)P(2) | 1338.56 | 3.1 | 0.5 | |
| (0–2)R(0) | (0–5)P(2) | 1398.95 | 2.6 | 0.04 | |
| λ1217.20 Å | (0–6)P(2) | 1460.17 | 1.5 | < 10−2 | |
| (0–7)P(2) | 1521.59 | 0.6 | < 10−3 | wl | |
| [0,2] | (0–4)P(3) | 1342.26 | 2.8 | 1.6 | |
| (0–2)R(1) | (0–5)R(1) | 1393.96 | 1.6 | 0.15 | bw H2 |
| λ1217.64 Å | (0–5)P(3) | 1402.65 | 2.3 | 0.16 | bw Si IV |
| (0–6)P(3) | 1463.83 | 1.4 | 0.01 | ||
| (0–7)P(3) | 1525.15 | 0.5 | < 10−2 | wl | |
Notes. All wavelengths and Aul values are taken from Abgrall et al. (1993). (a)The line notation is as follows: a progression [ν′,J′] consists of all transitions from the upper level with a rotational quantum number J′ and a vibrational quantum number ν′ in the electronic state 
to all levels with J″ and ν″ in the ground state 
. Thus, the line identifications are written as (ν′−ν″)R(J″) for J′−J″=−1 and (ν′−ν″)P(J″) for J′−J″=+1. (b)Optical depth τlu refers to gas temperatures of 2000 K; the assumptions we made for the calculation are detailed in Sect. 3.2. (c)Abbreviations used: wl: weak line; bw: blend with.
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