Table 9
Median value of abundances relative to H2 and N(H2) of each targeted species X observed toward different cloud components.
| Species | All cloud(a) | Diffuse cloud | Translucent cloud | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | N(X)/N(H2) | N(H2) (cm−2) | # | N(X)/N(H2) | N(H2) (cm−2) | # | N(X)/N(H2) | N(H2) (cm−2) | |
| HCN | 64 | 4.80 × 10−9 | 9.69 × 1020 | 31 | 4.49 × 10−9 | 5.26 × 1020 | 30 | 6.13 × 10−9 | 1.72 × 1021 |
| HNC | 42 | 1.17 × 10−9 | 1.11 × 1021 | 16 | 1.02 × 10−9 | 5.77 × 1020 | 23 | 1.40 × 10−9 | 1.80 × 1021 |
| C2H | 46 | 3.84 × 10−8 | 1.09 × 1021 | 20 | 4.11 × 10−8 | 5.40 × 1020 | 24 | 3.82 × 10−8 | 1.72 × 1021 |
| c-C3H2 | 33 | 1.36 × 10−9 | 8.68 × 1020 | 17 | 1.93 × 10−9 | 5.26 × 1020 | 14 | 1.23 × 10−9 | 1.72 × 1021 |
| CS | 28 | 3.26 × 10−9 | 1.20 × 1021 | 10 | 9.28 × 10−9 | 5.40 × 1020 | 18 | 2.77 × 10−9 | 1.74 × 1021 |
| H2S | 16 | 7.67 × 10−9 | 1.50 × 1021 | 4 | 2.53 × 10−8 | 4.02 × 1020 | 11 | 6.62 × 10−9 | 1.69 × 1021 |
Notes. (a)Includes all cloud types (dense, translucent, and diffuse). The # columns indicate the number of foreground components used for the statistics. All features associated with background sources are excluded in these calculations because the column densities of these features only represent lower limits.
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