Table 5
Preshock fractional abundances of observed species and other related species in different preshock densities of n = 2 × 104 cm-3, 2 × 105 cm-3, and 2 × 106 cm-3.
| Preshock densities (cm-3) | ||||
| Species | 2 × 104 | 2 × 105 | 2 × 106 | |
|
|
||||
| HCN | 3.6(–9) | 2.8(–8) | 6.1(–10) | |
| HCN (ice) | 8.5(–9) | 2.1(–8) | 3.5(–8) | |
| HNC | 7.9(–10) | 1.2(–8) | 3.8(–10) | |
| HNC (ice) | 5.4(–11) | 3.0(–9) | 9.8(–9) | |
| CN | 3.5(–8) | 4.4(–9) | 9.6(–12) | |
| HCO+ | 3.3(–11) | 1.4(–9) | 7.8(–10) | |
| CO | 9.0(–6) | 3.6(–5) | 5.9(–6) | |
| CO (ice) | 3.0(–7) | 9.3(–6) | 4.2(–5) | |
| CS | 8.4(–10) | 1.9(–9) | 1.2(–10) | |
| CS (ice) | 2.1(–14) | 2.2(–14) | 2.2(–14) | |
| SO | 8.1(–14) | 1.4(–12) | 6.7(–11) | |
| SO (ice) | 4.5(–14) | 6.7(–13) | 6.9(–11) | |
| H2S (ice) | 7.0(–8) | 7.6(–8) | 7.8(–8) | |
| N2H+ | 2.9(–11) | 6.9(–11) | 7.0(–11) | |
| N2 (ice) | 1.9(–7) | 2.0(–6) | 6.3(–6) | |
| NH3 (ice) | 2.6(–6) | 4.8(–6) | 6.5(–6) | |
| NO | 2.0(–9) | 3.1(–9) | 8.4(–8) | |
| NO (ice) | 8.4(–11) | 8.1(–10) | 1.3(–7) | |
| H3O+ | 6.9(–11) | 1.7(–9) | 3.9(–10) | |
| H2O | 9.2(–9) | 2.9(–7) | 8.9(–8) | |
| H2O (ice) | 2.9(–5) | 7.3(–5) | 1.2(–4) | |
| H2CO | 9.8(–10) | 3.5(–10) | 2.4(–10) | |
| H2CO (ice) | 1.0(–10) | 5.4(–9) | 3.8(–8) | |
| SiO | 6.2(–12) | 1.4(–11) | 1.7(–12) | |
| SiH4 (ice) | 7.6(–9) | 7.9(–9) | 7.9(–9) | |
| HC3N | 5.3(–14) | 2.8(–11) | 4.8(–11) | |
| HC3N (ice) | 2.0(–15) | 2.1(–12) | 2.1(–10) | |
| CH4 (ice) | 6.5(–6) | 2.0(–5) | 2.2(–5) | |
Notes. Species on grain surfaces are indicated with “(ice)”, while species without any note mean that they are in the gas phase. A value of a × 10−b is expressed as a(−b).
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