Table 1. Observed line parameters of the target O-bearing COMs of this study in TMC-1.
| Molecule | Transition | Eup (K) | v calc (MHz) | T*A peak (mK) | △va (km s−) | VLSR (km s−1) | ∫ T*Adv (mK km s−1) | S/N b (σ) | B eff/F eff c |
|---|---|---|---|---|---|---|---|---|---|
| trans-C2H3CHO | 41,4-31,3 | 6.2 | 34768.987 | 3.06 ± 0.31 | 0.62 ± 0.08 | 5.77 ± 0.03 | 2.03 ± 0.21 | 14.5 | 0.603 |
| 40,4-30,3 | 4.3 | 35578.136 | 3.77 ± 0.33 | 0.81 ± 0.08 | 5.79 ± 0.03 | 3.27 ± 0.27 | 19.4 | 0.597 | |
| 41,3 −31,2 | 6.4 | 36435.990 | 3.17 ± 0.29 | 0.85 ± 0.09 | 5.73 ± 0.04 | 2.87 ± 0.25 | 19.2 | 0.590 | |
| 51,5-41,4 | 8.3 | 43455.469 | 1.81 ± 0.49 | 0.72 ± 0.27 | 5.78 ± 0.08 | 1.38 ± 0.37 | 6.5 | 0.530 | |
| 50,5-40,4 | 6.4 | 44449.749 | 3.67 ± 0.54 | 0.54 ± 0.08 | 5.80 ± 0.04 | 2.11 ± 0.31 | 10.5 | 0.521 | |
| 51,4-41,3 | 8.6 | 45538.994 | 4.72 ± 0.66 | 0.69 ± 0.09 | 5.80 ± 0.04 | 3.45 ± 0.43 | 12.6 | 0.511 | |
| syn-C2H3OH | 40,4-31,3 | 9.3 | 32449.221 | 1.17 ± 0.32 | 1.07 ± 0.21 | 5.61 ± 0.11 | 1.34 ± 0.27 | 6.8 | 0.622 |
| 21,2-11,1 | 5.1 | 37459.184 d | – | – | – | – | – | 0.581 | |
| 20,2-10,1 | 2.8 | 39016.387 | 1.90 ± 0.39 | 0.89 ± 0.16 | 5.81 ± 0.07 | 1.79 ± 0.29 | 9.0 | 0.568 | |
| 21,1-11,0 | 5.3 | 40650.606 | 1.71 ± 0.41 | 0.65 ± 0.19 | 5.88 ± 0.08 | 1.18 ± 0.28 | 6.7 | 0.554 | |
| HCOOCH3 | 31,3-21,2 E | 4.0 | 34156.889 | 1.92 ± 0.29 | 0.62 ± 0.12 | 5.93 ± 0.06 | 1.27 ± 0.23 | 9.6 | 0.608 |
| 31,3-21,2 A | 3.9 | 34158.061 | 1.86 ± 0.29 | 0.80 ± 0.16 | 5.84 ± 0.07 | 1.59 ± 0.28 | 10.6 | 0.608 | |
| 30,3-20,2 E | 3.5 | 36102.227e | – | – | – | – | – | 0.593 | |
| 30,3-20,2 A | 3.5 | 36104.775 | 2.61 ± 0.29 | 0.74 ± 0.09 | 5.80 ± 0.04 | 2.05 ± 0.22 | 14.6 | 0.592 | |
| 31,2-21,1 E | 4.4 | 38976.085 | 1.81 ± 0.35 | 0.66 ± 0.14 | 5.93 ± 0.07 | 1.28 ± 0.25 | 8.3 | 0.568 | |
| 31,2-21,1 A | 4.4 | 38980.803 | 2.45 ± 0.35 | 0.57 ± 0.09 | 5.92 ± 0.04 | 1.49 ± 0.21 | 10.4 | 0.568 | |
| 41,4-31,3 E | 6.1 | 45395.802 | 2.82 ± 0.57 | 0.63 ± 0.18 | 6.00 ± 0.07 | 1.89 ± 0.40 | 8.3 | 0.512 | |
| 41,4-31,3 A | 6.1 | 45397.360 | 2.39 ± 0.57 | 0.42 ± 0.19 | 5.91 ± 0.10 | 1.07 ± 0.32 | 5.8 | 0.512 | |
| 40,4-30,3 E | 5.8 | 47534.116 | 3.19 ± 0.75 | 0.59 ± 0.12 | 5.92 ± 0.07 | 2.01 ± 0.44 | 7.1 | 0.493 | |
| 40,4-30,3 A | 5.8 | 47536.905 | 2.76 ± 0.75 | 0.98 ± 0.23 | 5.99 ± 0.10 | 2.88 ± 0.60 | 7.9 | 0.493 | |
| CH3OCH3 | 21,1 −20,2 AE + EA | 4.2 | 31105.223 | 1.35 ± 0.39 | 0.92 ± 0.25 | 5.72 ± 0.13 | 1.31 ± 0.36 | 5.8 | 0.632 |
| 21,1-20,2 EE | 4.2 | 31106.150 | 1.52 ± 0.39 | 0.54 ± 0.34 | 5.94 ± 0.08 | 0.87 ± 0.29 | 5.0 | 0.632 | |
| 31,2-30,3 AE + EA | 7.0 | 32977.276 | 1.37 ± 0.25 | 0.63 ± 0.13 | 5.84 ± 0.07 | 0.91 ± 0.19 | 7.8 | 0.618 | |
| 31,2-30,3 EE | 7.0 | 32978.232 | 1.37 ± 0.25 | 0.95 ± 0.23 | 5.84 ± 0.09 | 1.38 ± 0.27 | 9.6 | 0.618 | |
| 31.2-30,3 AA | 7.0 | 32979.187 | 1.06 ± 0.25 | 0.85 ± 0.32 | 5.99 ± 0.12 | 0.96 ± 0.29 | 7.1 | 0.618 | |
| 41.3-40,4 EE | 10.8 | 35593.408 | 1.22 ± 0.27 | 0.56 ± 0.13 | 5.82 ± 0.07 | 0.73 ± 0.16 | 6.4 | 0.597 | |
| 11,1-00,0 EE | 2.3 | 47674.967 | 3.31 ± 0.62 | 0.59 ± 0.12 | 6.02 ± 0.06 | 2.08 ± 0.38 | 8.9 | 0.492 |
The line parameters T*A peak, Δv, VLSR, and ∫ T*Adv and the associated errors are derived from a Gaussian fit to each line profile.
a
Δv is the full width at half maximum (FWHM).
b
Signal-to-noise ratio is computed as S/N = ∫T*Adv / [rms × -, where c is the speed of light, δv is the spectral resolution (0.03815 MHz), the rms is given in the uncertainty of T*A peak, and the rest of parameters are given in the table.
c
Beff is given by the Ruze formula B eff = 0.738 exp [™(v/72.2)2], where v is the frequency in GHz, and F eff = 0.97.
d
Line overlaps with a hyperfine component of CH2CCH (see Agúndez et al. 2021).
e
Line detected but not fitted because it overlaps with a negative frequency-switching artifact.