Table 1.
Typical line ratios of N2H+, HCN and 12CO in M 51.
| Line ratio | Average ± sdev |
|---|---|
| N2H+/HCN (1–0) | 0.20 ± 0.09 |
| N2H+/HCN center | 0.15 ± 0.05 |
| N2H+/HCN disk | 0.24 ± 0.26 |
| N2H+/HCN in beam-size regions: | |
| Region 1 (nucleus) | 0.08 ± 0.04 |
| Region 2 | 0.33 ± 0.06 |
| Region 3 | 0.28 ± 0.07 |
| Region 4 | 0.23 ± 0.03 |
| Region 5 | 0.24 ± 0.04 |
| HCN/CO (1–0) | 0.05 ± 0.04 |
| HCN/12CO center | 0.10 ± 0.07 |
| HCN/12CO disk | 0.04 ± 0.02 |
| N2H+/CO (1–0) | 0.012 ± 0.006 |
| N2H+/12CO center | 0.015 ± 0.007 |
| N2H+/12CO disk | 0.011 ± 0.005 |
Notes. Average line ratios of N2H+-to-HCN as well as HCN-to-12CO and N2H+-to-12CO for regions with both HCN and N2H+ emission > 3σ (see Fig. 1). We list values for the full FoV, as well as for the central 1.5 kpc in diameter (center) and the remaining disk. For the N2H+-to-HCN ratio we further provide ratios of five N2H+-bright beam-sized regions in the disk selected visually (compare Fig. 1). The uncertainty is the standard deviation.
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