Table 2
Complex organic molecule lines detected in IRAS 4A2 and Gaussian fit results.
| Molecule | Transition | ν 0 | E up | S μ 2 a | Flux | V lsr | ΔV | T peak | Noteb |
| (GHz) | (K) | (D2) | (Jy km s-1) | (km s-1) | (km s-1) | (mJy beam-1) | |||
|
|
|||||||||
| CH3CN | 65 − 55 | 110.33035 | 197.1 | 38.9 | 0.07 ± 0.02 | 5.6 ± 0.3 | 1.5 ± 0.6 | 43 ± 28 | |
| CH3CN | 64 − 54 | 110.34947 | 132.8 | 70.7 | 0.19 ± 0.02 | 6.4 ± 0.2 | 2.8 ± 0.5 | 64 ± 17 | |
| CH3CN | 63 − 53 | 110.36435 | 82.8 | 191 | 0.32 ± 0.02 | 6.9 ± 0.1 | 3.4 ± 0.3 | 91 ± 17 | |
| CH3CN | 62 − 52 | 110.37499 | 47.1 | 113 | 0.30 ± 0.02 | 6.9 ± 0.1 | 3.0 ± 0.3 | 94 ± 17 | |
| CH3CN | 61 − 51 | 110.38137 | 25.7 | 123 | 0.26 ± 0.02 | 6.8 ± 0.1 | 2.5 ± 0.3 | 101 ± 17 | |
| CH3CN | 60 − 50 | 110.38350 | 18.5 | 127 | 0.28 ± 0.02 | 7.0 ± 0.1 | 2.9 ± 0.4 | 89 ± 17 | |
|
|
|||||||||
| t-HCOOH | 120,12 − 110,11 | 262.10348 | 82.8 | 24.2 | 0.42 ± 0.02 | 6.9 ± 0.1 | 3.8 ± 0.2 | 100 ± 10 | |
| CH3CHO | 141,14 − 131,13 E | 260.53040 | 96.4 | 81.6 | 0.61 ± 0.08 | 6.7 ± 0.1 | 2.1 ± 0.4 | 270 ± 70 | |
| HCOOCH3 | 209,12 − 199,11 E vt = 1 | 245.54388 | 364.6 | 42.5 | 0.15 ± 0.02 | 6.9 ± 0.1 | 2.2 ± 0.3 | 62 ± 16 | |
| HCOOCH3 | 2016,4 − 1916,3 A | 245.57471 | 293.6 | 38.3 | 0.14 ± 0.03 | 6.9 ± 0.2 | 1.8 ± 0.5 | 72 ± 27 | 2T |
| HCOOCH3 | 203,17 − 193,16 A vt = 1 | 248.71584 | 320.9 | 51.0 | 0.13 ± 0.01 | 7.0 ± 0.1 | 1.6 ± 0.1 | 75 ± 8 | |
| HCOOCH3 | 205,16 − 195,15 E | 249.03100 | 141.6 | 49.7 | 0.37 ± 0.01 | 6.9 ± 0.1 | 1.9 ± 0.1 | 180 ± 10 | |
| HCOOCH3 | 205,16 − 195,15 A | 249.04743 | 141.6 | 49.7 | 0.44 ± 0.02 | 6.9 ± 0.1 | 2.2 ± 0.1 | 190 ± 20 | |
| CH3OCH3 | 135,8 − 134,9 AE | 262.38922 | 118.0 | 64.8 | 0.11 ± 0.01 | 6.9 ± 0.1 | 1.6 ± 0.2 | 63 ± 15 | |
| CH3OCH3c | 135,8 − 134,9 | 262.39325 | 118.0 | 283 | – | – | – | – | 3T |
| CH3OCH3 | 304,26 − 303,27 | 264.21161 | 446.9 | 856 | 0.12 ± 0.01 | 7.1 ± 0.1 | 2.5 ± 0.2 | 46 ± 8 | 4T |
| (CH3)2CO | 223,19 − 214,18 AE | 246.40427 | 149.6 | 2302 | 0.08 ± 0.01 | 7.1 ± 0.1 | 1.8 ± 0.3 | 43 ± 12 | 4T |
| (CH3)2CO | 241,23 − 232,22 AA | 248.70330 | 156.2 | 3048 | 0.12 ± 0.01 | 7.1 ± 0.1 | 2.2 ± 0.2 | 52 ± 8 | 2T |
| cis-CH2OHCHO | 252,24 − 241,23 | 262.05678 | 170.8 | 111 | 0.22 ± 0.01 | 6.8 ± 0.1 | 2.5 ± 0.1 | 83 ± 8 | |
| C2H5OH | 143,11 − 133,10 | 246.41476 | 155.7 | 21.4 | 0.20 ± 0.03 | 6.8 ± 0.1 | 2.1 ± 0.3 | 92 ± 28 | |
| C2H5CN | 292,27 − 282,26 | 263.81079 | 194.71 | 427 | 0.13 ± 0.01 | 6.9 ± 0.1 | 1.7 ± 0.2 | 68 ± 12 | |
| NH2CHO | 120,12 − 110,11 | 247.39072 | 78.1 | 157 | 0.40 ± 0.01 | 7.1 ± 0.1 | 4.2 ± 0.1 | 89 ± 6 | |
| HNCO | 120,12 − 110,11 | 263.74863 | 82.3 | 30.0 | 0.82 ± 0.03 | 6.9 ± 0.1 | 3.8 ± 0.2 | 200 ± 30 | |
Notes.
For those lines with several blended transitions of the same species at (almost) the same rest frequencies, this is the sum of Sμ2 of all the transitions involved.
Gaussian fit not performed owing to blending of different CH3OCH3 transitions (see Fig. 2).
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