Table 3
Rotational diagram parameters for IRS7B.
| Molecule | Trot | Nrot |
| [K] | [cm-2] | |
|
|
||
| H2COa | 40.3 ± 2.9 | (1.0 ± 0.1) × 1014 |
| D2CO | 31.2 ± 4.2 | (1.8 ± 0.3) × 1012 |
H CO |
13.6 ± 1.8 | (3.4 ± 1.3) × 1012 |
| CH3OH | 27.6 ± 0.9 | (1.6 ± 0.1) × 1014 |
| CH3CCH | 32.9 ± 2.1 | (1.1 ± 0.2) × 1014 |
| H2CS | 23.2 ± 2.1 | (8.4 ± 2.1) × 1012 |
| SO | 28.9 ± 1.9 | (7.1 ± 1.1) × 1013 |
| SO2 | 38.0 ± 2.5 | (1.8 ± 0.2) × 1013 |
| CS | 23.8 ± 2.6 | (7.3 ± 1.8) × 1013 |
| C34S | 18.5 ± 1.9 | (6.4 ± 1.7) × 1012 |
| CN | 9.9 ± 0.3 | (1.8 ± 0.1) × 1014 |
| DCN | 10.9 ± 0.9 | (2.6 ± 0.6) × 1012 |
| HC3N | 15.6 ± 1.9 | (6.1 ± 6.6) × 1014 |
| C2H | 16.9 ± 2.8 | (2.8 ± 1.2) × 1014 |
| c-C3H2 | 16.9 ± 0.7 | (8.5 ± 0.9) × 1012 |
| HNCO | 30 b | (5.1 ± 1.9) × 1012 |
| CH3CN | 30 b | (8.7 ± 3.9) × 1011 |
| CH3CHO | 30 b | (1.6 ± 0.7) × 1013 |
Notes.
The H2CO fit is a weighted average of the Ju = 3 and Ju = 5 fits. The two fits were also used to estimate the H2 number density, n(H2) = (8.9 ± 1.0) × 105 cm-3.
For these species, the Eu of the observed lines are in too narrow a range for the rotational temperature to be accurately calculated, or all detected lines are of a very low S/N level. We assumed a temperature of 30 ± 5 K (based on the rotational temperatures of similar species) to be able to estimate the column densities of these molecules.
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