Table 6
Rotation temperatures and column densities obtained using population diagrams.
| Molecule | IRAS 15194–5115 | IRAS 15082–4808 | IRAS 07454–7112 | |||
|---|---|---|---|---|---|---|
| Trot (K) | Ntot (cm−2) | Trot (K) | Ntot (cm−2) | Trot (K) | Ntot (cm−2) | |
| SiO | 14(1) | 1.0(1) × 1016 | 13(1) | 7(1) × 1015 | 18(2) | 9(2) × 1015 |
| 29SiO | 15(1) | 3.9(6) × 1014 | 14(1) | 2.1(4) × 1014 | 18(2) | 2.9(5) × 1014 |
| 30SiO | 28(9) | 9(7) × 1013 | – | – | – | – |
| SiS | 39(2) | 1.0(1) × 1016 | 35(3) | 1.3(2) × 1016 | 91(21) | 8(2) × 1016 |
| 29SiS | – | – | 26(2) | 8(1) × 1014 | 91(22) | 2.5(7) × 1015 |
| 30SiS | – | – | – | – | 85(27) | 1.7(7) × 1015 |
| Si34S | – | – | 43(6) | 5(1) × 1014 | – | – |
| SiC2 | 23(1) | 4.4(3) × 1014 | 30(2) | 8(1) × 1014 | 42(2) | 1.7(1) × 1015 |
| CS | 12(1) | 3.9(6) × 1016 | 11(1) | 6(1) × 1016 | – | – |
| 13cs | 15(1) | 2.5(5) × 1015 | – | – | – | – |
| c34s | 18(2) | 5(1) × 1014 | 15(2) | 7(1) × 1014 | 17(2) | 4.1(8) × 1014 |
| HCN | 9(1) | 1.4(3) × 1016 | 8(1) | 4.8(9) × 1016 | 10(1) | 3.7(6) × 1016 |
| H13CN | 8(1) | 9(2) × 1015 | 7(1) | 2.9(5) × 1015 | 9(1) | 9(2) × 1015 |
| HNC | 7(1) | 7(1) × 1013 | – | – | – | – |
| HC3N | 15(1) | 5(1) × 1014 | 20(1) | 9(1) × 1014 | 23(1) | 1.6(1) × 1015 |
| C3N | – | – | 27(3) | 2.9(6) × 1014 | 46(2) | 2.7(3) × 1014 |
| HC5N | – | – | 20(3) | 8(6) × 1014 | 27(4) | 5(2) × 1014 |
| C2H | 12(1) | 8(2) × 1015 | 16(6) | 6(3) × 1015 | – | – |
| C4H | 35(1) | 8.6(7) × 1014 | 44(2) | 6.1(7) × 1014 | 75(10) | 2.6(6) × 1014 |
Notes. Trot and Ntot stand for rotational temperature and total column density, respectively. The values in parentheses indicate the uncertainty in the immediately preceding digit. This is a formal uncertainty of the fit, and hence provides a measure of the quality of the population diagram. The absolute uncertainty, in particular of the column density, is substantially larger, as discussed in the text.
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