Table 1
Observed line parameters in TMC-1.
| Molecule | Transition | vcalc (MHz) | Eup (K) | Tb, calc (a) (mK) | VLSR(b) (km s−1) | Δυ(b)(km s−1) |  peak(b) (mK) |
 dυ(b) (mK km s−1) |
S/N(c) (σ) |
|---|---|---|---|---|---|---|---|---|---|
| C2H5OH | 41,3−40,4 | 32 742.830 | 9.9 | 3.68 | 5.57 ± 0.12 | 1.03 ± 0.24 | 0.67 ± 0.17 | 0.73 ± 0.16 | 7.2 |
| 51,4−50,5 | 36 417.242 | 14.3 | 2.31 | 5.83 ± 0.09 | 1.49 ± 0.22 | 0.76 ± 0.12 | 1.21 ± 0.15 | 14.7 | |
| 11,1−00,0 | 43 026.811 | 2.1 | 4.62 | 5.76 ± 0.04 | 1.09 ± 0.07 | 1.90 ± 0.18 | 2.21 ± 0.15 | 22.8 | |
| 40,4−31,3 | 46 832.826 | 8.4 | 3.14 | 5.68 ± 0.03 | 0.90 ± 0.06 | 2.38 ± 0.23 | 2.28 ± 0.15 | 21.1 | |
| CH3COCH3 | 30,3−21,2 EE | 33 562.123 | 3.6 | 1.11 | 5.87 ±0.14 | 0.99 ± 0.25 | 0.40 ± 0.13 | 0.42 ± 0.11 | 5.6 |
| 30,3−21,2 AA | 33 566.289 | 3.6 | 0.75 | 5.46 ± 0.10 | 0.90 ± 0.16 | 0.46 ± 0.12 | 0.44 ± 0.09 | 6.6 | |
| 31,3−20,2 EE | 34 092.973 | 3.6 | 1.15 | 5.89 ± 0.17 | 1.36 ± 0.40 | 0.44 ± 0.15 | 0.64 ± 0.16 | 6.3 | |
| 22,1−11,0 EE | 35 381.289 | 2.7 | 0.85 | – | – | – | – | –(d) | |
| 40,4−31,3 EE | 43 597.127 | 5.7 | 1.54 | 5.95 ± 0.07 | 0.90 ± 0.16 | 0.79 ± 0.17 | 0.76 ± 0.12 | 9.2 | |
| 40,4−31,3 AA | 43 604.463 | 5.7 | 0.61 | – | – | – | – | –(e) | |
| 41,4−30,3 AE | 43 680.468 | 5.8 | 0.61 | – | – | – | – | –(f) | |
| 41,4−30,3 EE | 43 689.327 | 5.7 | 1.54 | 5.73 ± 0.08 | 0.50 ± 0.17 | 0.61 ± 0.17 | 0.33 ± 0.10 | 5.4 | |
| 41,4−30,3 AA | 43 698.504 | 5.7 | 1.03 | 5.84 ± 0.11 | 0.74 ± 0.24 | 0.71 ± 0.21 | 0.55 ± 0.16 | 6.0 | |
| 32,2−21,1 EE | 45 233.560 | 4.6 | 0.94 | – | – | – | – | –(e) | |
| C2H5CHO | 40,4−31,3 | 32 897.820 | 5.0 | 0.72 | – | – | – | – | –(d) |
| 31,2−21,1 | 33 346.830 | 3.8 | 0.96 | 5.59 ± 0.15 | 0.99 ± 0.26 | 0.38 ± 0.10 | 0.40 ± 0.11 | 6.9 | |
| 31,3−20,2 | 39 061.035 | 3.4 | 1.10 | 5.78 ± 0.10 | 0.79 ± 0.20 | 0.45 ± 0.15 | 0.38 ± 0.09 | 5.3 | |
| 41,4−31,3 | 39 177.138 | 5.3 | 1.26 | 5.93 ± 0.10 | 0.73 ± 0.18 | 0.46 ± 0.15 | 0.36 ± 0.09 | 5.2 | |
| 40,4-30,3 | 40 915.768 | 5.0 | 1.47 | 5.81 ± 0.12 | 1.11 ± 0.31 | 0.59 ± 0.16 | 0.70 ± 0.16 | 7.9 | |
| 42,3−32,2 | 41 883.719 | 7.2 | 0.78 | – | – | – | – | –(f) | |
| 42,2−32,1 | 42 936.277 | 7.3 | 0.80 | – | – | – | – | –(e) | |
| 50,5−41,4 | 44 189.959 | 7.4 | 0.97 | – | – | – | – | –(f) | |
| 41,3−31,2 | 44 319.499 | 5.9 | 1.30 | 6.07 ± 0.07 | 0.56 ± 0.19 | 0.67 ± 0.18 | 0.40 ± 0.11 | 5.8 | |
| 41,4−30,3 | 47 195.073 | 5.3 | 1.31 | 5.90 ± 0.11 | 0.89 ± 0.29 | 0.92 ± 0.25 | 0.88 ± 0.22 | 7.6 | |
| 51,5−41,4 | 48 801.725 | 7.6 | 1.40 | 5.63 ± 0.11 | 0.60 ± 0.19 | 0.79 ± 0.28 | 0.51 ± 0.16 | 4.9 | |
Notes. (a) Tb, calc is the peak brightness temperature calculated in local thermodynamic equilibrium for a rotational temperature of 6.0 K. We adopted the column density and line width derived for each molecule (see Sect. 3).(b) The line parameters VLSR, Δυ, 
peak, and 
dυ and the associated errors are derived from a Gaussian fit to each line profile. Δυ is the full width at half maximum.(c) The signal-to-noise ratio is computed as 
, where c is the speed of light, δν is the spectral resolution (0.03815 MHz), the rms is given in the uncertainty of 
peak, and the rest of the parameters are given in the table. (d) Line is only marginally detected.(e) Line is not detected. Expected intensity is within the noise level.(f) Line is not detected. It overlaps with a negative frequency-switching artifact.
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