Table 3
Properties of the different molecules considered in this study.
| Molecule | Transition | Frequency | ALMA | Abundance | Sensitivity σ | PWV |
| [GHz] | band | N/N(H) | [mJy] | [mm] | ||
|
|
||||||
| (1−0) | 115.27 | 3 | 7.46 | 5.2 | ||
| (2−1) | 230.54 | 6 | 3.14 | 1.3 | ||
| 12C16O | (3−2) | 345.80 | 7 | 1 × 10-4 | 4.12 | 0.66 |
| (4−3) | 461.04 | 8 | 11.66 | 0.47 | ||
| (6−5) | 691.47 | 9 | 38.02 | 0.47 | ||
|
|
||||||
| (1−0) | 109.78 | 3 | 3.68 | 2.7 | ||
| (2−1) | 219.56 | 6 | 3.11 | 1.3 | ||
| 12C18O | (3−2) | 6.2 | 7 | 2 × 10-7 | 8.6 | 0.66 |
| (4−3) | 439.09 | 8 | 61.96 | 0.47 | ||
| (6−5) | 658.55 | 9 | 38.66 | 0.47 | ||
|
|
||||||
| (1−0) | 89.19 | 3 | 3.87 | 5.2 | ||
| (3−2) | 267.56 | 6 | 3.04 | 0.91 | ||
| HCO+ | (4−3) | 356.73 | 7 | 1 × 10-8 | 4.63 | 0.66 |
| (5−4) | 445.90 | 8 | 1087.7 | 0.47 | ||
| (7−6) | 624.21 | 9 | 137.81 | 0.47 | ||
| (8−7) | 713.34 | 9 | 112.10 | 0.47 | ||
|
|
||||||
| (1−0) | 88.63 | 3 | 3.89 | 5.2 | ||
| (3−2) | 265.89 | 6 | 2.97 | 0.91 | ||
| HCN | (4−3) | 354.51 | 7 | 1 × 10-9 | 4.48 | 0.66 |
| (5−4) | 443.12 | 8 | 46.78 | 0.47 | ||
| (7−6) | 620.30 | 9 | 4.89 × 105 | 0.47 | ||
| (8−7) | 708.88 | 9 | 59.91 | 0.47 | ||
|
|
||||||
| (2−1) | 97.98 | 3 | 3.38 | 2.7 | ||
| (3−2) | 146.97 | 4 | 3.17 | 1.8 | ||
| (5−4) | 244.94 | 6 | 2.9 | 0.91 | ||
| (6−5) | 293.91 | 7 | 3.82 | 0.91 | ||
| CS | (7−6) | 342.88 | 7 | 1 × 10-8 | 4.12 | 0.66 |
| (8−7) | 391.85 | 8 | 9.77 | 0.47 | ||
| (9−8) | 440.80 | 8 | 27.2 | 0.47 | ||
| (10−9) | 489.75 | 8 | 32.11 | 0.47 | ||
| (13−12) | 636.53 | 9 | 35.96 | 0.47 | ||
| (14−13) | 685.44 | 9 | 33.13 | 0.47 | ||
Notes. We note that the sensitivity is calculated with the ALMA sensitivity calculator (version: April 2015) for an observation of three hours considering 50 antennas in dual-polarization mode. The sensitivity strongly depends on the atmospheric transmission, which explains the high values for some transitions. We use the recommended values for the precipitable water vapor (PWV) column density for each transition, which are also included in the sensitivity calculator.
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