Table C.1
Molecular data of the transitions analyzed in this work.
| Species | Transition | Frequency (GHz) | Eu (K) | log10 Aul (s−1) | gu | ncrita (cm−3) |
|---|---|---|---|---|---|---|
| C17O | J = 1–0, F = 3/2 − 5/2 | 112.359 | 5.39 | −7.174 | 4 | (2.0 − 2.1) × 103 |
| J = 1–0, F = 7/2 − 5/2 | 112.359 | 5.39 | −7.174 | 8 | (2.0 − 2.1) × 103 | |
| J = 1–0, F = 5/2 − 5/2 | 112.360 | 5.39 | −7.174 | 6 | (2.0 − 2.1) × 103 | |
| J = 2 − 1, F = 3/2 − 5/2 | 224.713 | 16.18 | −6.715 | 4 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 5/2 − 5/2 | 224.714 | 16.18 | −6.407 | 6 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 7/2 − 5/2 | 224.714 | 16.18 | −6.384 | 8 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 9/2 − 7/2 | 224.714 | 16.18 | −6.192 | 10 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 1/2 − 3/2 | 224.714 | 16.18 | −6.192 | 2 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 3/2 − 3/2 | 224.715 | 16.18 | −6.347 | 4 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 5/2 − 7/2 | 224.715 | 16.18 | −7.292 | 6 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 7/2 − 7/2 | 224.715 | 16.18 | −6.639 | 8 | (1.0 − 1.1) × 104 | |
| J = 2 − 1, F = 5/2 − 3/2 | 224.715 | 16.18 | −6.699 | 6 | (1.0 − 1.1) × 104 | |
| C18O | J = 1–0 | 109.782 | 5.27 | −7.203 | 3 | (1.8 − 1.9) × 103 |
| J = 2 − 1 | 219.560 | 15.81 | −6.221 | 5 | (0.9 − 1.0) × 104 | |
| H2CO | JKa,Kc = 202–101 | 145.603 | 10.48 | −4.107 | 5 | (0.9 − 1.1) × 106 |
| CH3OH | JK = 3−1–2−1 (E) | 145.097 | 19.51 | −4.960 | 7 | (8.4 − 9.1) × 104 |
| CH2COb | JKa,Kc = 515–414 | 100.095 | 27.46 | −4.988 | 33 | − |
| CH3CHOb | JKa,Kc = 514–13 (E) | 98.863 | 16.59 | −4.508 | 22 | − |
| JKa,Kc = 616–5 (E) | 112.255 | 21.21 | −4.330 | 26 | − | |
| JKa,Kc = 616−515 (A) | 112.249 | 21.13 | −4.331 | 26 | − | |
| HNCO | JKa,Kc = 505–404 | 109.906 | 15.82 | −4.756 | 11 | (2.4 − 2.5) × 105 |
| HC3N | J = 11 − 10 | 100.076 | 28.82 | −4.110 | 23 | (1.5 − 1.7) × 106 |
| CH3CN | JK = 60–50 (A) | 110.384 | 18.54 | −3.954 | 26 | (1.9 − 2.4) × 106 |
| JK = 61–51 (E) | 110.381 | 25.69 | −3.966 | 26 | (2.0 − 2.5) × 106 | |
| JK = 62–52 (E) | 110.375 | 47.12 | −4.005 | 26 | (1.6 − 2.0) × 106 |
Notes. This covers all the lines analyzed throughout this work, including the legacy data described in Sect. 2.4. All molecular data are taken from the Cologne Database for Molecular Spectroscopy (CDMS; Endres et al. 2016) except for CH3CHO, which is from the Jet Propulsion Laboratory database (JPL; Pickett et al. 1998).
(a)For those species with available collisional rates in the Leiden Atomic and Molecular Database (LAMDA; Schöier et al. 2005), the critical density (ncrit) is estimated as the density at which the rate of spontaneous radiative de-excitation (Aul) equals the rate of collisional de-excitation (γul) for temperatures between 20 − 60 K.
(b)Although CH2CO and CH3CHO lack available collisional rates, their emission is likely sub-thermal (nH2 < ncrit), as suggested by the low Tex values reported by Guzmán et al. (2014), which are adopted in this work.
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