Table 2
Upper limits obtained for the Gg and Gg′ conformers of n-propanol for the anti and gauche conformers of i-propanol, and for the trans conformer of ethyl methyl ether.
| Species | Formula | Frequency (MHz) | QNs  |
Eu (K) | log I(300 K) (nm2 MHz) | rms (mK) | N(a) (cm−2) | Abundance(b) |
|---|---|---|---|---|---|---|---|---|
| n-propanol (Gg) | Gg-n-C3H7OH | 75 699.1096 | 33,1 − 22,1 | 75.7 | –6.1471 | 2.3 | ≤1.6 × 1013(c) | ≤1.2×10−10 |
| 75 700.5781 | 33,0−22,1 | 75.7 | –6.2273 | 2.3 | – | – | ||
| n-propanol (Gg′) | Gg′-n-C3H7OH | 87 730.9823 | 101,10−91,9 | 97.0 | –5.2641 | 0.9 | ≤5.7 × 1012 | ≤4.2 × 10−11 |
| Isopropanol (gauche) | g-i-C3H7OH | 88 532.3081 | 41,4−31,3 | 7.5 | –5.7726 | 1.8 | ≤8.5 × 1012 (c) | ≤6.3 × 10−11 |
| 88 538.5001 | 40,4−30,3 | 7.5 | –5.7737 | 1.8 | – | – | ||
| Isopropanol (anti) | a-i-C3H7OH | 79 734.1627 | 81,8−70,7 | 137.9 | –5.5140 | 2.7 | ≤3.9 × 1012 (c) | ≤2.9 × 10−11 |
| 79 734.1627 | 80,8−71,7 | 137.9 | –5.5140 | 2.7 | – | – | ||
| Ethyl methyl ether (trans) | t-CH3OCH2CH3 | 73 243.2848 | 42,3−41,4 | 8.5 | –5.6357 | 2.7 | ≤3.8 × 1013 | ≤2.8 × 10−10 |
Notes. (a)Upper limits to the column densities calculated assuming a Tex=12.5 K, i.e. the same as the one derived for Aa-n-C3H7OH, and after fixing VLSR = 69 kms−1 and Δv = 20 kms−1 (see Sect. 3.1). (b)Abundances were derived considering a H2 column density of 1.35 × 1023 cm−2 (Martín et al. 2008). (c)Upper limits were obtained considering the two transitions shown in the table, which appear blended in the spectra. The selected transitions are the cleanest and the brightest of all the lines covered in our observations.
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