Table 9
Upper limits to the abundances of CH3CSNH2 and CH3CONH2 toward the ASAI sources and the spectral line parameters used to calculate the upper limits in each of the sets of observations.
| Source | Frequency | Transition | Eu | Sij μ2 | Q(Qrot, Qvib) | NT | N(H2) | XH_2 |
|---|---|---|---|---|---|---|---|---|
| (MHz) | ( ) |
(K) | (Debye2) | (cm−2) | (cm−2) | |||
| CH3CSNH2 | ||||||||
| Barnard 1 | 91 379.2 | 112,9−102,8 A | 28.9 | 156.8 | 807 (807, 1.00) | ≤1.06 × 1012 | 1.5 × 1023 | ≤7 × 10−12 |
| IRAS 4A | 104 127.5 | 15*,15−14*,14 A | 41.1 | 495.4 | 2484 (2484, 1.00) | ≤1.97 × 1012 | 3.7 × 1023 | ≤5 × 10−12 |
| L1157B1 | 90 679.9 | 13*,13−12*,12 A | 31.4 | 427.9 | 16 702 (16 702, 1.00) | ≤4.61 × 1012 | 1 × 1021 | ≤5 × 10−9 |
| L1157mm | 104 078.1 | 15*,15−14*,14 E | 42.4 | 495.6 | 16 702 (16 702, 1.00) | ≤2.53 × 1012 | 6 × 1021 | ≤4 × 10−10 |
| L1448R2 | 97 403.7 | 14*,14−13*,13 A | 36.1 | 461.6 | 16 702 (16 702, 1.00) | ≤7.48 × 1012 | 3.5 × 1023 | ≤2 × 10−11 |
| L1527 | 104 127.5 | 15*,15−14*,14 A | 41.1 | 495.4 | 1045 (1045, 1.00) | ≤4.15 × 1011 | 2.8 × 1022 | ≤1 × 10−11 |
| L1544 | 91 492.8 | 103,7−93,6 A | 26.1 | 142.5 | 807 (807, 1.00) | ≤5.49 × 1011 | 5 × 1021 | ≤1 × 10−10 |
| SVS13A | 238 335.5 | 34*,33−33*,32 A | 207.7 | 1115.6 | 29 696 (29 696, 1.00) | ≤1.82 × 1016 | 3 × 1024 | ≤6 × 10−10 |
| CH3CONH2 | ||||||||
| Barnard 1 | 87 632.5 | 8*,8−7*,7 E | 19.7 | 194.8 | 370 (370, 1.00) | ≤2.01 × 1011 | 1.5 × 1023 | ≤1 × 10−12 |
| IRAS 4A | 108 255.2 | 10*,10−9*,9 E | 29.7 | 254.0 | 1382 (1382, 1.00) | ≤1.60 × 1012 | 3.7 × 1023 | ≤4 × 10−12 |
| L1157B1 | 108 255.2 | 10*,10−9*,9 E | 29.7 | 254.0 | 10 929 (10 929, 1.00) | ≤4.27 × 1012 | 1 × 1021 | ≤4 × 10−9 |
| L1157mm | 97 943.9 | 9*,9−8*,8 E | 24.5 | 226.8 | 10 929 (10 929, 1.00) | ≤2.97 × 1012 | 6 × 1021 | ≤5 × 10−10 |
| L1448R2 | 149 411.2 | 14*,14−13*,13 A | 61.4 | 361.6 | 10 929 (10 929, 1.00) | ≤1.08 × 1013 | 3.5 × 1023 | ≤3 × 10−11 |
| L1527 | 87 632.5 | 8*,8−7*,7 E | 19.7 | 194.8 | 500 (500, 1.00) | ≤1.54 × 1011 | 2.8 × 1022 | ≤6 × 10−12 |
| L1544 | 97 943.9 | 9*,9−8*,8 E | 24.5 | 226.8 | 370 (370, 1.00) | ≤1.64 × 1011 | 5 × 1021 | ≤3 × 10−11 |
| SVS13A | 25 2588.4 | 24*,24−23*,23 E | 154.4 | 632.8 | 19 442 (19 442, 1.00) | ≤9.79 × 1015 | 3 × 1024 | ≤3 × 10−9 |
Notes. The approximate center frequency is listed for those transitions that are not resolved given the spectroscopic resolution of the astronomical observations. Each of these lines consists of two a-type and two b-type transitions (for example, 15*,15 − 14*,14 refers to the following 4 transitions: 150,15−141,14, 151,15 − 141,14, 151,15 − 140,14 and 151,15 − 141,14 that are nearly frequency coincident). The listed Sijμ2 value is the sum of all four transitions in each group. This coincidence is indicated by the asterisk substituted for the Ka quantum number. The total partition functions and column densities were calculated at the measured temperature of each source as listed in Table 3.
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