Table 1
Rotational temperatures, column densities, and abundances derived from rotational diagrams for S-bearing species in the Horsehead nebula.
| PDR | Core | |||||
|---|---|---|---|---|---|---|
| Species | Trot | N(X) | Abundance | Trot | N(X) | Abundance |
| (K) | (cm −2) |  |
(K) | (cm−2) |  |
|
| CS (a) | 6.3 | (3.0 ± 0.6) × 1013 | (8.0 ± 2.0) × 10−10 | 5.9 | (5.3 ± 1.0) × 1013 | (9.0 ± 2.0) × 10−10 |
| SO (a) | 11.6 | (3.2 ± 0.3) × 1013 | (8.4 ± 0.8) × 10−10 | 8.2 | (5.0 ± 0.5) × 1013 | (8.6 ± 0.9) × 10−10 |
| p-H2CS | 4.2 | (5.0 ± 3.0) × 1011 | (1.3 ± 0.8) × 10−11 | 8.6 | (9.0 ± 1.0) × 1011 | (1.6 ± 0.2) × 10−11 |
| o-H2CS | 8.8 | (9.0 ± 3.0) × 1011 | (2.4 ± 0.8) × 10−11 | 8.2 | (2.5 ± 0.8) × 1012 | (4.3 ± 1.4) × 10−11 |
| SO2 | 6.5 | (3.0 ± 0.6) × 1012 | (8.0 ± 1.6) × 10−11 | 6.9 | (2.9 ± 0.6) × 1012 | (5.0 ± 1.0) × 10−11 |
| CCS | 10.3 | (3.0 ± 1.0) × 1011 | (8.0 ± 2.6) × 10−12 | 8.1 | (1.5 ± 0.7) × 1012 | (2.6 ± 1.2) × 10−11 |
| HCS+ | 11.6 | (5.0 ± 0.6) × 1011 | (1.3 ± 0.2) × 10−11 | 10 (b) | 6 × 1011 | 1.0 × 10−11 |
| SO+ | 11 | (6.3 ± 1.8) × 1011 | (1.7 ± 0.5) × 10−11 | 9 | (4.5 ± 0.5) × 1011 | (7.8 ± 0.9) × 10−12 |
| HDCS | 10 (b) | (6 ± 1) × 1011 | (2 ± 0.4) × 10−11 | 10 (b) | (1 ± 0.2) × 1012 | (2 ± 0.4) × 10−11 |
| NS | 10 (b) | (4 ± 0.8) × 1012 | (1 ± 0.2) × 10−10 | 10 (b) | (3 ± 0.6) × 1012 | (5 ± 1) × 10−11 |
| NS+ | 10 (b) | (1 ± 0.2) × 1011 | (3 ± 0.6) × 10−12 | 10 (b) | (6 ± 1) × 1010 | (1 ± 0.2) × 10−12 |
| DCS+ | 10 (b) | <1.0 × 1011 | <3 × 10−12 | 10 (b) | <1.0 × 1011 | <2 × 10−12 |
| CCCS | 10 (b) | <3.2 × 1011 | <8 × 10−12 | 10 (b) | <3.2 × 1011 | <5 × 10−12 |
Notes. Abundances are computed assuming N(H2) = 1.9 × 1022 cm−2 towards the PDR and N(H2) = 2.9 × 1022 cm−2 towards the core from Gerin et al. (2009a). (a) Computed including opacity effects. (b) Since only one transition was detected, we assumed Trot = 10 K and fitted the column density to match the observed TMB assuming LTE.
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