Table 5.
13CO/12CO(1−0), CO(2–1)/CO(1–0), HCO+/HCN, and HCN/CO(1−0) values for the different sources shown in Fig. 6.
| Source | 12CO/13CO(1−0) | CO(2−1)/CO(1−0) | HCO+/HCN(1−0) | HCN/CO(1−0) | Ref. | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Size | Mean ratio | Size | Mean ratio | Size | Mean ratio | Size | Mean ratio | ||||||||||
| Headlight | 140 pc | 7.20 | 140 pc | 0.70 | 140 pc | 1.0 | 140 pc | 0.03 | This work | ||||||||
| Orion B | 6.5 pc | 6.50 | 6.5 pc | 0.75 | 6.5 pc | 1.10 | 6.5 pc | 0.92 | S94, P17 | ||||||||
| 30 Dor-10 | 8 pc | 6.47 | 10 pc | 1.07 | 1.5 pc ( † ) | 5 | 1.5 pc ( † ) | 0.14 | P12, J98, A14 | ||||||||
| EMPIRE galaxies | Gal. | Disk | Cen. | Gal. | Disk | Cen. | Gal. | Disk | Cen. | Gal. | Disk | Cen. | C18, JD | ||||
| NGC 6946 | 0.9 kpc | 13.8 | 13.5 | 15.2 | 1.1 kpc | 0.65 | 0.64 | 0.68 | 1.1 kpc | 1.06 | 1.19 | 0.87 | 1.1 kpc | 0.73 | 0.50 | 1.14 | |
| NGC 5194 | 1.0 kpc | 10.3 | 9.9 | 8.2 | 1.2 kpc | 0.73 | 0.81 | 0.80 | 1.2 kpc | 0.75 | 0.97 | 0.65 | 1.2 kpc | 1.11 | 1.17 | 2.26 | |
| NGC 5055 | 1.0 kpc | 9.3 | 8.5 | 7.2 | 1.3 kpc | 0.59 | 0.59 | 0.68 | 1.3 kpc | 0.33 | 0.35 | 0.90 | 1.3 kpc | 1.19 | 1.07 | 0.71 | |
| NGC 2903 | 1.2 kpc | 10.3 | 11.0 | 12.3 | 1.4 kpc | 0.63 | 0.64 | 0.68 | 1.4 kpc | 0.53 | 0.42 | 0.72 | 1.4 kpc | 0.92 | 0.83 | 1.38 | |
| NGC 3627 | 1.2 kpc | 12.0 | 12.2 | 15.2 | 1.5 kpc | 0.48 | 0.47 | 0.48 | 1.5 kpc | 0.90 | 0.87 | 0.91 | 1.5 kpc | 0.76 | 0.59 | 0.70 | |
| NGC 0628 | 1.3 kpc | 13.2 | 13.5 | 9.9 | 1.5 kpc | 0.61 | 0.64 | 0.57 | 1.5 kpc | 0.55 | 0.47 | 0.89 | 1.5 kpc | 0.54 | 0.72 | 0.63 | |
| NGC 3184 | 1.5 kpc | 10.2 | 10.7 | 11.2 | 1.9 kpc | 0.53 | 0.53 | 0.52 | 1.9 kpc | 0.52 | 0.55 | 0.77 | 1.9 kpc | 0.42 | 0.39 | 0.62 | |
| NGC 4321 | 1.9 kpc | 10.3 | 10.3 | 10.9 | 2.3 kpc | 0.57 | 0.56 | 0.62 | 2.3 kpc | 0.90 | 1.03 | 0.75 | 2.3 kpc | 1.14 | 0.84 | 1.57 | |
| NGC 4254 | 1.9 kpc | 11.0 | 10.5 | 8.4 | 2.3 kpc | 0.74 | 0.74 | 0.75 | 2.3 kpc | 1.19 | 1.23 | 0.79 | 2.3 kpc | 0.75 | 0.70 | 1.23 | |
Notes. For nearby galaxies from the EMPIRE survey, the average ratios are given for entire galaxies, disks, and centers. The physical sizes used to derive these ratios are also listed. ( † )The lines were observed at an angular resolution corresponding to 29 pc.
References. S94: Sakamoto et al. (1994); P17: Pety et al. (2017); P12: Pineda et al. (2012); J98: Johansson et al. (1998); A14: Anderson et al. (2014); C18: Cormier et al. (2018); JD: Jiménez-Donaire et al. (2019).
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