Table 5
Extents of the emitting regions of selected molecular species.
| Molecule | IRAS 15194–5115 | IRAS 15082–4808 | IRAS 07454–7112 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ri | Re | Ri | Re | Ri | Re | |||||||
| [″] | [cm] | [″] | [cm] | [″] | [cm] | [″] | [cm] | [″] | [cm] | [″] | [cm] | |
| SiO | 0.0 | 0.0 | 1.8(1) | 1.8 × 1016 | 0.0 | 0.0 | 1.3(1) | 2.1 × 1016 | 0.0 | 0.0 | 0.9(1) | 7.6 × 1015 |
| SiS | 0.0 | 0.0 | 1.7(1) | 1.8 × 1016 | 0.0 | 0.0 | 1.2(1) | 1.9 × 1016 | 0.0 | 0.0 | 0.5(1) | 4.6 × 1015 |
| CS | 0.0 | 0.0 | 2.2(1) | 2.3 × 1016 | 0.0 | 0.0 | 1.6(1) | 2.4 × 1016 | 0.0 | 0.0 | 1.5(1) | 1.3 × 1016 |
| HCN | 0.0 | 0.0 | 3.0(2) | 3.1 × 1016 | 0.0 | 0.0 | 2.1(1) | 3.3 × 1016 | 0.0 | 0.0 | 1.5(1) | 1.3 × 1016 |
| CN | 4.4(7) | 4.6 × 1016 | 9.7(7) | 1.0 × 1017 | 2.1(2) | 3.3 × 1016 | 5.8(2) | 9.1 × 1016 | 1.1(1) | 9.9 × 1015 | 3.7(1) | 3.3 × 1016 |
| C2H | 3.7(3) | 3.9 × 1016 | 7.8(3) | 8.1 × 1016 | 1.8(2) | 2.8 × 1016 | 4.9(2) | 7.7 × 1016 | 0.7(2) | 6.1 × 1015 | 2.6(2) | 2.3 × 1016 |
| C3H | 2.8(2) | 2.9 × 1016 | 7.0(2) | 7.3 × 1016 | – | – | – | – | 0.3(1) | 2.6 × 1015 | 1.9(1) | 1.7 × 1016 |
| C4H | 4.4(2) | 4.6 × 1016 | 7.9(2) | 8.2 × 1016 | 2.0(3) | 3.1 × 1016 | 4.4(3) | 6.9 × 1016 | 0.3(4) | 2.6 × 1015 | 2.6(4) | 2.3 × 1016 |
| c-C3H2 | 3.4(7) | 3.5 × 1016 | 8.4(7) | 8.7 × 1016 | – | – | – | – | – | – | – | – |
| SiC2 | 2.3(3) | 2.4 × 1016 | 6.7(3) | 7.0 × 1016 | 1.2(4) | 1.9 × 1016 | 3.7(4) | 5.8 × 1016 | 0.3(1) | 2.6 × 1015 | 2.1(1) | 1.8 × 1016 |
| HC3N | 0.8(3) | 8.3 × 1015 | 5.9(3) | 6.1 × 1016 | 0.6(2) | 9.4 × 1015 | 3.5(2) | 5.5 × 1016 | 0.4(1) | 3.4 × 1015 | 2.0(1) | 1.8 × 1016 |
| C3N | 4.5(2) | 4.7 × 1016 | 8.0(2) | 8.3 × 1016 | 2.2(1) | 3.5 × 1016 | 4.9(1) | 7.7 × 1016 | 0.9(1) | 8.5 × 1015 | 2.6(1) | 2.3 × 1016 |
| HC5N | 3.0(7) | 3.1 × 1016 | 7.0(7) | 7.3 × 1016 | 1.2(2) | 1.9 × 1016 | 3.8(2) | 6.0 × 1016 | 0.7(2) | 6.1 × 1015 | 2.0(2) | 1.7 × 1016 |
| HNC | 3.3(3) | 3.4 × 1016 | 8.0(3) | 8.3 × 1016 | 1.5(1) | 2.4 × 1016 | 5.0(1) | 7.9 × 1016 | 0.7(1) | 6.1 × 1015 | 2.5(1) | 2.2 × 1016 |
Notes. Ri and Re denote the inner and outer radii, respectively. For the centrally peaked species (SiO, SiS, CS, and HCN), we set the inner radii to zero. The values in parentheses in the arcsecond columns show the uncertainty in the last decimal place. These are formal errors from the Gaussian fits from which the radii were obtained. Conversion from angular to spatial distances was done using the distances in Table 1.
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