Table 1
Prediction of maser lines for different sets of collisional rate coefficients.
| Transition | Frequency | He | p-H2 | p-H2 | o-H2 | o-H2 |
| (GHz) | Green | SET1 | SET2 | SET1 | SET2 | |
|
|
||||||
| |τ22| | 8.2 (10.7) | 5.3 (7.1) | 9.1 (15.1) | 4.9 (6.8) | 7.6 (10.1) | |
|
|
||||||
| 61,6 − 52,3 | 22 | 1.00 (1.00) | 1.00 (1.00) | 1.00 (1.00) | 1.00 (1.00) | 1.00 (1.00) |
| 102,9 − 93,6 | 321 | 0.73 (0.88) | 1.11 (1.16) | 0.67 (0.70) | 1.17 (1.15) | 0.78 (0.89) |
| 41,4 − 32,1 | 380 | 0.53 (1.78) | 0.83 (2.14) | 0.50 (1.85) | 0.93 (2.35) | 0.59 (1.63) |
| 64,3 − 55,0 | 439 | 0.48 (0.63) | 0.83 (1.03) | 0.48 (0.69) | 0.91 (1.05) | 0.60 (0.93) |
| 75,2 − 66,1 | 443 | 0.02 (0.05) | 0.15 (0.21) | 0.11 (0.13) | 0.16 (0.24) | 0.17 (0.25) |
| 42,3 − 33,0 | 448 | 0.42 (1.49) | 0.68 (1.89) | 0.39 (1.69) | 0.74 (1.84) | 0.49 (1.55) |
| 11,0 − 10,1 | 557 | < 0.01 | < 0.01 | < 0.01 | < 0.01 | < 0.01 |
| 53,2 − 44,1 | 621 | 0.45 (1.69) | 0.76 (2.31) | 0.42 (1.77) | 0.82 (2.13) | 0.53 (1.84) |
| 72,5 − 81,8 | 1146 | N (N) | < 0.01 | N (N) | < 0.01 | N (N) |
| 31,2 − 22,1 | 1153 | 0.02 (0.02) | 0.17 (0.18) | < 0.01 | 0.20 (0.26) | < 0.01 |
| 63,4 − 54,1 | 1158 | 0.18 (0.80) | 0.36 (1.61) | 0.15 (0.56) | 0.44 (2.07) | 0.24 (1.37) |
| 85,4 − 76,1 | 1165 | 0.09 (0.11) | 0.21 (0.35) | 0.04 (0.04) | 0.21 (0.37) | 0.15 (0.24) |
| 74,3 − 65,2 | 1278 | 0.17 (0.49) | 0.38 (1.50) | 0.14 (0.41) | 0.43 (1.70) | 0.21 (0.79) |
| 82,7 − 73,4 | 1296 | 0.31 (0.76) | 0.54 (1.70) | 0.30 (0.90) | 0.59 (1.89) | 0.34 (0.78) |
| 84,5 − 91,8 | 1308 | N (N) | N (N) | N (N) | N (N) | N (N) |
| 62,5 − 53,2 | 1322 | 0.19 (0.34) | 0.41 (0.95) | 0.21 (0.27) | 0.46 (0.99) | 0.26 (0.45) |
| 85,4 − 92,7 | 1596 | N (N) | N (N) | N (N) | N (N) | N (N) |
| 84,5 − 75,2 | 1885 | 0.01 (0.02) | 0.06 (0.06) | 0.01 (0.01) | 0.10 (0.10) | 0.03 (0.03) |
| 52,3 − 43,2 | 1918 | < 0.01 | < 0.01 | < 0.01 | 0.01 (0.01) | < 0.01 |
| 83,6 − 74,3 | 2245 | < 0.01 | 0.20 (0.30) | 0.01 (0.02) | 0.27 (0.43) | 0.01 (0.02) |
| 73,4 − 64,3 | 2567 | < 0.01 | < 0.01 | N (N) | < 0.01 | < 0.01 |
| 83,6 − 90,9 | 2577 | N (N) | N (N) | (N) | N (N) | N (N) |
| 92,7 − 101,10 | 2619 | N (N) | N (N) | (N) | N (N) | N (N) |
| 94,5 − 85,4 | 3150 | N (N) | N (N) | (N) | N (N) | N (N) |
Notes.The first line gives the maximum 22 GHz opacity (τ22) obtained for the density and temperature range covered in this study (see Sect. 4). For each masing line, the ratio of the maximum opacity to τ22 is given, using the approximate treatment described in Sect. 3 (numbers in parentheses) or the current method. The transitions in bold correspond to the maser transitions predicted by the present work and not predicted by Yates et al. (1997). The transitions with opacity ratio below 10-5, as well as the transitions that do not show population inversion, are reported with the symbol N.
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