Table 5.
HCN/CO(1–0) vs. Σmol relations.
| m (unc.) | b (unc.) | σ | Σmol res. | HCN/CO res. | Σmol method | Reference |
|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
| 0.61 (0.10) | −2.64 (0.21) | 0.28 | 260 pc | 260 pc | beam-matched | this work |
| 0.72 (–) | −2.88 (–) | – | 300 − 600 pc | 300 − 600 kpc | beam-matched | Gallagher et al. (2018b) |
| 0.81 (0.09) | −3.80 (0.21) | – | 120 pc | 650 pc | CO-weighted average | Gallagher et al. (2018a) |
| 0.50 (0.10) | −2.40 (0.20) | – | ∼2 kpc | ∼2 kpc | beam-matched | Jiménez-Donaire et al. (2019) |
| 0.41 (0.03) | −2.70 (0.08) | 0.14 | ∼100 pc | 1 − 2 kpc | CO-weighted average | Neumann et al. (2023b) |
| 0.71 (0.03) | −3.30 (0.80) | – | ∼0.1 pc | ∼0.1 pc | beam-matched | Tafalla et al. (2023) |
| 0.59 (0.03) | −2.64 (0.04) | 0.18 | 1 − 2 kpc | 1 − 2 kpc | beam-matched | Neumann, Jiménez-Donaire et al. (in prep.) |
Notes. Best-fit lines of HCN/CO vs. Σmol of the form shown in Eq. (10), with slope m (column 1), intercept b (column 2) and respective uncertainties. σ (column 3) denotes the 1-sigma scatter of the significant data about the fit line. The lines are plotted in Fig. 9. Columns 4 and 5 list the respective x- (Σmol) and y-axis (HCN/CO) resolutions. “Beam-matched” (column 6) refers to a matched resolution of the x- and y-axis data, and “CO-weighted average” denotes a CO intensity-weighted average measurement of Σmol, adopted in Gallagher et al. (2018a) and Neumann et al. (2023b). The differences between the physical scales and methodologies are discussed in the text.
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