Table 7
Mean values of column density corrected for beam-dilution, abundance, and excitation temperature of CH3CN in the TOPGöt sample.
| Total sample | Sub-sample I | Sub-sample II | ||||
|---|---|---|---|---|---|---|
| HMSC | HMSCw | HMPO | UC HII | |||
| n° sources | (72/58)(*) | (6/6) | (3/2) | (9/5) | (7/5) | (47/40) |
N [cm−2] |
2.4 × 1013 | 1.6 × 1012 | 1.4 × 1013 | 3.2 × 1013 | 4.3 × 1013 | 2.2 × 1013 |
 |
2.1 × 10−10 | 3.0 × 10−11 | 2.7 × 10−10 | 3.3 × 10−10 | 3.2 × 10−10 | 2.1 × 10−10 |
| Tex [K] | 43 | 30 | 39 | 50 | 42 | 44 |
Notes. The third row reports two numbers: the first number (largest) indicates the number of sources over which we derived the mean values of 
and Tex. The second number indicates the number of sources over which we derived the mean values of
. The latter value is smaller because we could not analyze the SED for all the sources for which we detected CH3CN. ((*)) the total number of sources for which CH3CN has been detected is 73, but for G31.41+0.31 we could not derive the physical parameters.
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