Table 4.
MADCUBA-derived physical parameters.
| Species | Column density | Excitation temperature | ||
|---|---|---|---|---|
| log N (cm−2) (a) | Tex (K) | |||
| APM | NC | APM | NC | |
| C | 18.2 (16.9) | 18.7 (17.6) | 36 | 25 |
| 12C16O | 17.5 (15.7) | 17.9 (16.7) | 40 | 25 |
| 13C16O | 16.1 (15.2) | 16.3 (15.5) | 36 | 25 |
| 12C18O | 16.2 (15.3) | 16.7 (15.7) | 36 | 25 |
| CN | 14.0 (12.8) | 14.4 (13.5) | 36 | 25 |
| CCH | 14.7 (13.8) | 14.9 (14.0) | 36 | 25 |
| HCN | 14.2 (12.9) | 14.1 (13.4) | 37 (2) | 26 (4) |
| HCO+ | 13.9 (12.7) | 13.7 (13.2) | 36 (2) | 24 (4) |
| HNC | 14.0 (13.0) | 14.0 (13.6) | 32 (2) | 19 (4) |
| CS | 14.6 (13.4) | 14.3 (13.7) | 36 | 25 |
| H2O | 16.4 (14.9) | 15.6 (15.2) | 230 (20) | 230 |
| H3O+ | 15.5 (14.5) | – | 36 | – |
| NO | 16.0 (15.3) | – | 36 | – |
| HCNv2 = 1f | 15.1 (14.0) | – | 300 | – |
| N2H+ | 13.1 (12.1) | – | 36 | – |
| C34S | 14.0 (13.4) | 14.1 (13.7) | 36 | 25 |
| CH | 14.1 (13.0) | – | 36 | – |
| c-C3H2 | 14.0 (13.2) | – | 36 | – |
Notes. LTE-derived column densities and excitation temperatures of APM 08279+5255 (APM for short) and NCv1.143 (NC for short). We note that the values are not corrected for lensing magnification. Temperature values without errors indicate species for which this parameter could not be constrained and was fixed to the value derived from HCN and HCO+. Although most of the lines are well modeled with a single temperature, for APM 0879+5255, the vibrationally excited HCN (v2 = 1f) requires significantly higher kinetic temperatures. The same applies to the H2O lines, where a pure collisional excitation cannot explain the fluxes well. Values in brackets are errors.
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