Table 2
Parameters obtained from the detected spectral lines(a).
| Lines used(b) | N(c) | Tex(c) | log(N/N(H2))(d) |  |
|---|---|---|---|---|
| ×1015 cm−2 | K | log cm−2 | log cm−2 | |
| CH3CN υ8 = 1 J = 12-11 K = −5 to 8 | 5 ± 0.2 | 333 ± 21 | −8.7 ± 1.1 | 24.4± 1.1 |
| CH3CN υ = 0 J = 12-11 K = 4 to 9 | 4 ± 0.1 | 327±19 | −8.7 ± 1.1 | 24.3 ± 1.1 |
| CH3OH υt = 0 80,8−7ı,6 E | 500 ± 80 | 285±15 | −7.3 ± 1.0 | 26.4 ± 1.0 |
| CH3CN υ = 0 J = 12−11 K = 0 to 3 | 6 ± 0.3 | 248 ± 10 | −8.7 ± 1.1 | 24.5 ± 1.1 |
Notes. (a)For a position ~0.″05 to the SW of MM1a, see Sect. 3.2. (b)Throughout the paper we use the nomenclature of the JPL catalogue. (c)Determined using the SLIM task of the MADCUBA package by simultaneously fitting multiple transitions of CH3CN υ8 = 1 (the whole spectrum), CH3CN υ = 0 (low and high-K transition fitted separately), and CH3OH (including the weaker transitions 253,22−244,20 and 235,19−226,17) under the assumption of local thermodynamic equilibrium; the fitting process directly adjusts Tex and N to reproduce the observed line intensities and their ratios, without assuming a prior relation between Tex and the column density. (d)The abundances are calculated from the average column densities reported in Gieser et al. (2021).
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