Table 2.
Spearman rank correlation coefficients for several scaling relations.
| SFEdense vs. | Fdense vs. | SFEdense vs. | Fdense vs. | SFEmol vs. | ΣSFR vs. | ΣSFR vs. | |
|---|---|---|---|---|---|---|---|
| Σ⋆ | Σ⋆ | σHCN | σHCN | bCO | Fdense | Σdense | |
| M 51: all detections | −0.24 (0.00) | 0.11 (0.07) | −0.42 (0.00) | 0.28 (0.00) | 0.06 (0.29) | −0.04 (0.42) | 0.40 (0.00) |
| • HCN peaks | −0.34 (0.08) | 0.46 (0.02) | −0.62 (0.03) | 0.15 (0.47) | 0.14 (0.65) | 0.04 (0.87) | −0.06 (0.84) |
| • CO peaks | 0.28 (0.30) | −0.27 (0.31) | −0.52 (0.07) | 0.34 (0.20) | 0.44 (0.15) | 0.36 (0.23) | 0.01 (0.97) |
| • 33 GHz peaks | −0.28 (0.32) | 0.10 (0.72) | −0.15 (0.60) | 0.50 (0.06) | −0.29 (0.32) | 0.16 (0.59) | 0.31 (0.27) |
| M 51 (incl. Chen+17) | −0.57 (0.00) | 0.70 (0.00) | – | – | – | 0.63 (0.00) | 0.58 (0.00) |
| M 51, M 31, NGC 3627 | −0.54 (0.00) | 0.71 (0.00) | −0.53 (0.01) | 0.42 (0.01) | 0.11 (0.61) | 0.66 (0.00) | 0.74 (0.00) |
Notes. Spearman ρ rank correlation coefficients (two-sided p-values) for different apertures and regions in M 51, as well as considering simultaneously our new measurements for HCN peaks in M 51 and comparable-scale measurements from the literature (Fig. 5–7). We exclude upper limits from the analysis (values < 3σ). Values in parenthesis indicate the p-value, and boldface identifies the correlations that are statistically significant (two-sided p-value < 5%).
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