Table 3
Model results for diffuse clouds conditions.
| Pressure | P = 3 × 103 (cm-3 K) | P = 104 (cm-3 K) | ||||
| Model | A | B | C | A | B | C |
|
|
||||||
| l (pc) | 14.6 | 14.7 | 14.7 | 1.5 | 1.5 | 1.5 |
 (cm-3) |
3.68 | 2.42 | 1.17 | 186 | 166 | 165 |
| Tobs(K) | 741 | 1127 | 2320 | 49 | 55 | 55 |
 (cm3 s-1) |
3.0(–17) | 5.8(–17) | 1.8(–16) | 3.0(–17) | 5.8(–17) | 5.9(–17) |
 (cm-3) |
74 | 73 | 73 | 542 | 542 | 542 |
| Tcenter(K) | 65 | 67 | 67 | 31 | 31 | 31 |
| N(H) | 5.1(20) | 3.4(20) | 2.6(20) | 8.0(19) | 4.6(19) | 4.5(19) |
| N(H2) | 6.8(20) | 7.7(20) | 8.1(20) | 9.0(20) | 9.1(20) | 9.1(20) |
| f | 0.73 | 0.82 | 0.86 | 0.96 | 0.97 | 0.98 |
| T01 (K) | 73 | 78 | 80 | 36 | 37 | 37 |
| N(C + ) | 2.4(17) | 2.5(17) | 2.5(17) | 2.2(17) | 2.2(17) | 2.2(17) |
| N(C) | 2.0(15) | 1.9(15) | 1.9(15) | 2.8(16) | 2.8(16) | 2.8(16) |
| N(O) | 6.0(17) | 6.0(17) | 6.0(17) | 6.0(17) | 6.0(17) | 6.0(17) |
| N(CO) | 4.2(13) | 3.7(13) | 3.6(13) | 9.2(13) | 1.2(14) | 1.2(14) |
| N(OH) | 9.6(13) | 9.3(13) | 9.0(13) | 4.9(12) | 5.3(12) | 5.3(12) |
| N(CH) | 2.0(12) | 3.0(12) | 3.3(12) | 2.7(13) | 3.7(13) | 3.7(13) |
| N(NH) | 9.8(10) | 1.1(11) | 1.1(11) | 4.9(10) | 5.0(10) | 5.0(10) |
| N(CN) | 3.7(10) | 4.8(10) | 5.0(10) | 2.4(12) | 3.2(12) | 3.2(12) |
| N(OH + ) | 2.3(12) | 1.9(12) | 1.8(12) | 1.0(10) | 1.1(10) | 1.1(10) |
| N(H2O + ) | 9.9(11) | 9.5(11) | 9.0(11) | 1.0(10) | 1.1(10) | 1.1(10) |
|
2.0(13) | 2.8(13) | 3.1(13) | 3.4(12) | 3.7(12) | 3.7(12) |
Notes. Models A, B, and C are defined in the text. Figures in parentheses correspond to powers of ten. Molecular fraction, f, is defined as 2 N(H2)/[2 N(H2) + N(H)] . T01 is the excitation temperature derived from the ratio of the column densities of the first two levels of molecular hydrogen. Superscript “obs” is for “edge of the cloud on the observer side” and “center” is for “center of the cloud”. Column densities N(X) are in cm-2.
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