Table 1
Rest frequencies, critical densities, and typical properties of the subset of emission lines in the ORION-B dataset that we consider in this paper.
| Emission Line | Rest Frequency (GHz) | ncrit (cm−3) | 〈Tpeak〉 (K) | 〈σv〉 (km s−1) | Covering fraction (%) | Masked / total flux (%) |
|---|---|---|---|---|---|---|
| 12CO(J= 1→0) | 115.271202 | 5.7 × 102 | 6.9 | 2.2 | 93 | 100 |
| 13CO(J= 1→0) | 110.201354 | 4.8 × 102 | 1.3 | 1.4 | 79 | 98 |
| HCO+ (J = 1 → 0) | 89.188526 | 4.6 × 104 | 0.2 | 1.0 | 61 | 88 |
| HCN(J =1→0) | 88.6318473 | 3.0 × 105 | 0.2 | 2.3 | 42 | 80 |
| 12CS (J = 2 → 1) | 97.980953 | 1.0 × 105 | 0.25 | 0.5 | 30 | 77 |
| C18O(J =1→0) | 109.782176 | 4.8 × 102 | 0.4 | 0.5 | 28 | 82 |
| HNC(J =1→0) | 90.663564 | 1.1 × 105 | 0.2 | 0.7 | 28 | 86 |
| 32SO(NJ = 32 → 21) | 99.299905 | 3.3 × 104 | 0.2 | 0.5 | 17 | 75 |
| N2H+ (J = 1 → 0) | 93.173777 | 4.1 × 104 | 0.2 | 2.8 | 3 | 85 |
Notes. The second column lists the rest frequency of the transition. The third column indicates the H2 critical density at a kinetic temperature of 20 K, accounting for all possible upward and downward collisional rates from the upper level. The fourth and fifth columns report each line’s median peak brightness and linewidth (including hyperfine structure for HCN (J=1→0) and N2H+ (J = 1 → 0)) in the ORION-B dataset, measured at the pixel-scale using all pixels detected in 12CO with S/N> 3. The sixth column displays the covering fraction of the different emission lines in the ORION-B dataset, as defined in Section 2.2. The final column reports the ratios of total emission between the masked and unmasked datacubes, defined in Section 2.2.
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