Table 1
Properties of the observed lines.
| λ [μm] | Transition | ncrit [cm-3] | Eu/k [K] | Aij [s-1] | |
|
|
|||||
| OH | 84.6a |  J = 7/2−–5/2+ |
1 (10)i | 291 | 5.20 (–01) |
| OH | 119.4a | J = 5/2+–3/2− |
1 (09)i | 120 | 1.38 (–01) |
| CH+ | 119.8b | J = 3–2 | 4 (09)j | 240 | 2.20 (–01) |
| CH+ | 179.6b | J = 2–1 | 6 (08)j | 120 | 6.10 (–02) |
| CH+ | 359.0b | J = 1–0 | 7 (07)j | 40 | 6.36 (–03) |
| CO | 137.3c | J = 19–18 | 5 (06)k | 1050 | 6.65 (–04) |
| 13CO | 227.1d | J = 12–11 | 2 (06)k | 412 | 1.52 (–04) |
| C18O | 341.5e | J = 8–7 | 6 (05)k | 190 | 4.47 (–05) |
| [CII] | 157.7f | 2P3/2–2P1/2 | 3 (03)l | 91 | 2.29 (–06) |
| [OI] | 145.5g | 3P0–3P1 | 2 (05)l | 327 | 1.66 (–05) |
| H2O | 269.3h | 111-000 | 1 (09)m | 53 | 1.84 (–02) |
| H2O | 398.7h | 211-200 | 3 (08)m | 137 | 7.05 (–03) |
Notes. Columns: wavelength (λ), transition, critical density (ncrit), upper level energy temperature (Eu/k), and Einstein coefficient (Aij). Numbers in parenthesis are power of 10.
Reference. References for the rest frequencies are: a) Pickett et al. (1998); b) Müller (2010); c) Winnewisser et al. (1997); d) Cazzoli et al. (2004); e) Klapper et al. (2001); f) Cooksy et al. (1986); g) Zink et al. (1991); h) Yu et al. (2012). The critical densities were calculated using the collisional rates with i) ortho-H2 (Offer et al. 1994); j) He (Hammami et al. 2008; Hammami et al. 2009); k) H2 (Yang et al. 2010); l) H0 (Launay & Roueff 1977); and m) para-H2 (Dubernet & Grosjean 2002; Phillips et al. 1996).
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