Table 2
Comparison to observed CO, HCN(1–0), and HCO+(1–0) data.
| Galaxy sample | CO | HCN(1–0) | HCN(1–0) GS04a | HCN(1–0) GC08b | HCO+(1–0) |
|
|
|||||
| Preferred model | |||||
|
|
|||||
| local spirals | 0.86 ± 0.31 | – | 1.72 ± 0.49 | 1.13 ± 0.26 | – |
| ULIRGs | 0.75 ± 0.37 | 0.67 ± 0.22 | 0.36 ± 0.15 | 0.51 ± 0.13 | 0.89 ± 0.30 |
| smm-galaxies | 0.67 ± 0.20 | – | 0.37 ± 0.06 | 0.69 ± 0.14 | – |
| high-z star-forming galaxies | 0.72 ± 0.39 | – | 0.18 ± 0.03 | 0.27 ± 0.06 | – |
|
|
|||||
| Constant abundances | |||||
|
|
|||||
| local spirals | 1.23 ± 0.38 | – | 0.86 ± 0.24 | 0.56 ± 0.12 | – |
| ULIRGs | 0.75 ± 0.36 | 0.32 ± 0.10 | 0.18 ± 0.09 | 0.25 ± 0.08 | 0.37 ± 0.12 |
| smm-galaxies | 0.63 ± 0.19 | – | 0.20 ± 0.05 | 0.37 ± 0.09 | – |
| high-z star-forming galaxies | 0.73 ± 0.36 | – | 0.21 ± 0.07 | 0.30 ± 0.07 | – |
|
|
|||||
| Q = 1 | |||||
|
|
|||||
| ULIRGs | 0.55 ± 0.33 | 0.61 ± 0.17 | 0.33 ± 0.14 | 0.46 ± 0.11 | 0.91 ± 0.29 |
| smm-galaxies | 0.63 ± 0.25 | – | 0.23 ± 0.03 | 0.44 ± 0.08 | – |
| high-z star-forming galaxies | 0.74 ± 0.43 | – | 0.19 ± 0.04 | 0.27 ± 0.06 | – |
|
|
|||||
| δ = 15 | |||||
|
|
|||||
| local spirals | 1.09 ± 0.47 | – | 2.20 ± 1.04 | 1.43 ± 0.60 | – |
| ULIRGs | 0.67 ± 0.40 | 0.78 ± 0.20 | 0.40 ± 0.13 | 0.57 ± 0.09 | 1.13 ± 0.36 |
| smm-galaxies | 0.86 ± 0.33 | – | 0.37 ± 0.04 | 0.69 ± 0.08 | – |
| high-z star-forming galaxies | 0.74 ± 0.43 | – | 0.19 ± 0.04 | 0.27 ± 0.06 | – |
|
|
|||||
| No cloud substructure | |||||
|
|
|||||
| local spirals | 1.16 ± 0.38 | – | 1.69 ± 0.49 | 1.10 ± 0.27 | – |
| ULIRGs | 0.94 ± 0.46 | 0.73 ± 0.25 | 0.38 ± 0.14 | 0.55 ± 0.13 | 1.01 ± 0.36 |
| smm-galaxies | 0.91 ± 0.30 | – | 0.39 ± 0.06 | 0.73 ± 0.15 | – |
| high-z star-forming galaxies | 0.93 ± 0.55 | – | 0.13 ± 0.04 | 0.19 ± 0.08 | – |
|
|
|||||
| No CR heating | |||||
|
|
|||||
| local spirals | 0.85 ± 0.31 | – | 1.70 ± 0.48 | 1.12 ± 0.26 | – |
| ULIRGs | 0.75 ± 0.37 | 0.44 ± 0.20 | 0.22 ± 0.07 | 0.32 ± 0.08 | 0.80 ± 0.32 |
| smm-galaxies | 0.67 ± 0.20 | – | 0.36 ± 0.06 | 0.68 ± 0.14 | – |
| high-z star-forming galaxies | 0.47 ± 0.27 | – | 0.12 ± 0.02 | 0.17 ± 0.03 | – |
|
|
|||||
| No HCN IR-pumping | |||||
|
|
|||||
| local spirals | 0.85 ± 0.31 | – | 1.70 ± 0.48 | 1.12 ± 0.26 | – |
| ULIRGs | 0.75 ± 0.37 | 0.61 ± 0.20 | 0.34 ± 0.16 | 0.47 ± 0.15 | 0.89 ± 0.30 |
| smm-galaxies | 0.67 ± 0.20 | – | 0.33 ± 0.03 | 0.63 ± 0.09 | – |
| high-z star-forming galaxies | 0.72 ± 0.39 | – | 0.16 ± 0.04 | 0.22 ± 0.05 | – |
Notes. Ratio between the model and observed line luminosities. Ratio between the model and observed line luminosities. Local spirals: CO(2–1); ULIRGs: CO(1–0); smm-galaxies: CO(3–2); high-z star-forming galaxies: CO(3–2).
With respect to the Gao & Solomon (2004) relation.
With respect to the Graciá-Carpio et al. (2008) relation.
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