Table A.2
Linewidth, the intensity integrated over the dispersion of each line (subtable I), and the integrated optical depth over the velocity dispersion of the strongest line among multiplet (subtable II).
| Species | Freq.1 | G28.34 S | IRDC 18530 | IRDC 18306 | IRDC 18308 | ||||
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I. Linewidth Δυ (km s-1) and integrated intensity  in four IRDCs |
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| (GHz) | (km s-1) | (K km s-1) | (km s-1) | (K km s-1) | (km s-1) | (K km s-1) | (km s-1) | (K km s-1) | |
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| OCS | 85.1391 | 3.91 ± 0.66 | 0.26 ± 0.04 | × | × | − | ≤0.05 | − | ≤0.06 |
| c-C3H2 | 85.3389 | 2.97 ± 0.10 | 1.51 ± 0.05 | × | × | 1.99 ± 0.12 | 0.69 ± 0.03 | 1.76 ± 0.23 | 0.34 ± 0.04 |
| c−CH3C2H(1) | 85.4557 | 3.08 ± 0.45 | 0.31 ± 0.04 | × | × | 2.21 ± 0.42 | 0.18 ± 0.03 | 2.81 ± 0.81 | 0.22 ± 0.06 |
| c−CH3C2H(2) | 85.4573 | 2.44 ± 0.42 | 0.26 ± 0.04 | × | × | 1.08 ± 0.55 | 0.08 ± 0.03 | − | ≤0.08 |
| NH2D | 85.9263 | 5.92 ± 1.04 | 0.41 ± 0.05 | 2.86 ± 0.44 | 0.17 ± 0.02 | 8.95 ± 1.16 | 0.32 ± 0.04 | 7.36 ± 1.53 | 0.21 ± 0.04 |
| H13CO+ | 86.7543 | 3.07 ± 0.06 | 1.32 ± 0.02 | 2.01 ± 0.06 | 0.55 ± 0.02 | 2.05 ± 0.10 | 0.50 ± 0.02 | 2.09 ± 0.09 | 0.59 ± 0.02 |
| SiO | 86.8470 | 4.83 ± 0.39 | 0.55 ± 0.03 | − | ≤0.03 | − | ≤0.25 | − | ≤0.03 |
| HN13C | 87.0909 | 2.99 ± 0.07 | 1.12 ± 0.02 | 1.71 ± 0.08 | 0.47 ± 0.02 | 2.24 ± 0.10 | 0.41 ± 0.02 | 2.08 ± 0.11 | 0.43 ± 0.02 |
| HNCO | 87.9244 | 2.68 ± 0.09 | 0.83 ± 0.02 | 1.75 ± 0.14 | 0.25 ± 0.02 | 2.13 ± 0.18 | 0.25 ± 0.02 | 2.11 ± 0.35 | 0.17 ± 0.02 |
| HCO+ | 89.1885 | 2.44 ± 0.08 | 5.27 ± 0.13 | 3.74 ± 0.05 | 4.74 ± 0.05 | 3.11 ± 0.28 | 1.72 ± 0.14 | 3.37 ± 0.06 | 5.52 ± 0.08 |
| HNC | 90.6636 | 2.59 ± 0.05 | 5.57 ± 0.08 | 3.10 ± 0.03 | 4.01 ± 0.03 | 2.94 ± 0.12 | 1.85 ± 0.07 | 2.83 ± 0.04 | 3.95 ± 0.05 |
| HC3N | 90.979 | 3.36 ± 0.16 | 0.70 ± 0.03 | 2.22 ± 0.23 | 0.20 ± 0.02 | 2.34 ± 0.22 | 0.25 ± 0.02 | 3.03 ± 0.87 | 0.14 ± 0.03 |
| 13CS | 92.4943 | 3.06 ± 0.39 | 0.22 ± 0.02 | − | ≤0.03 | 2.28 ± 0.42 | 0.11 ± 0.02 | − | ≤0.03 |
| H2CO | 218.222 | 3.73 ± 0.42 | 0.98 ± 0.09 | − | ≤0.15 | − | ≤0.15 | − | ≤0.14 |
| C18O | 219.56 | 3.70 ± 0.07 | 7.83 ± 0.13 | 2.42 ± 0.06 | 3.71 ± 0.08 | 1.95 ± 0.06 | 3.75 ± 0.10 | 1.94 ± 0.07 | 3.02 ± 0.10 |
| 13CO | 220.399 | 4.83 ± 0.20 | 21.18 ± 0.62 | 3.78 ± 0.13 | 16.24 ± 0.47 | 3.11 ± 0.25 | 9.79 ± 0.69 | 2.75 ± 0.13 | 14.15 ± 0.63 |
| C17O | 224.714 | 3.72 ± 0.25 | 2.35 ± 0.13 | × | × | 2.06 ± 0.12 | 1.26 ± 0.07 | 2.61 ± 0.36 | 0.70 ± 0.09 |
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| II. Linewidth Δυ(km s-1) and integrated optical depth τ0Δυ(km s-1) of the main line in four IRDCs | |||||||||
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| (GHz) | (km s-1) | (km s-1) | (km s-1) | (km s-1) | (km s-1) | (km s-1) | (km s-1) | (km s-1) | |
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| N2H+ | 93.1738 | 2.94 ± 0.01 | 1.14 ± 0.01 | 1.84 ± 0.04 | 1.20 ± 0.18 | 1.88 ± 0.03 | 1.19 ± 0.15 | 2.02 ± 0.02 | 0.20 ± 0.04 |
| C2H | 87.3169 | 2.90 ± 0.07 | 4.00 ± 0.59 | 1.85 ± 0.08 | 0.91 ± 0.48 | 1.73 ± 0.07 | 3.10 ± 0.66 | 1.76 ± 0.11 | 0.18 ± 0.17 |
| HCN | 88.6318 | 2.33 ± 0.06 | 0.23 ± 0.10 | 3.23 ± 0.05 | 0.32 ± 0.04 | 2.60 ± 0.19 ∗ | 25.80 ± 7.50∗ | 3.15 ± 0.10 | 2.43 ± 0.83 |
| H13CN | 86.3402 | 2.96 ± 0.12 | 0.54 ± 0.19 | 2.25 ± 0.27∗ | 0.23 ± 5.61∗ | 1.82 ± 0.64∗ | 0.62 ± 1.77∗ | 1.69 ± 0.34∗ | 0.17 ± 7.08∗ |
Notes. 1. Transition numbers are listed in Table A.1. 2. Values are obtained from the Gaussian/hyperfine multiplets fit program based on CLASS. 3. Uncertainties on the measured intensities are typically ≤10%. 4. For species that are not detected, an upper limit equal to the 3σ rms is given. 5. “−” denotes <3σ detection in our dataset, and the intensity upper limit comes from the 3σ rms of the entire region by integrating three channels in total around the Vlsr. 6. “ ×” denotes no observations in our dataset. 7. “∗” denotes a hyperfine multiplet that is not well fitted.
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