Table 3
Summary of the models that provide the best fit of each molecule, with the adopted scaling factor for the abundance profile.
| Molecule | Xcol | Scaling |  (a) |
Tex (b) | |
|---|---|---|---|---|---|
| factor | (1012 cm−2) | line(c) | (K) | ||
| N2H+ | t = 106 yr, AV = 1 | 2.7 | 17 | (1–0) | 5.6 |
| (3–2) | 5.0 | ||||
| (1–0) | 7.7 | ||||
| N2D+ | t = 106 yr, AV = 1 | 3.0 | 3.5 | (2–1) | 5.0 |
| (3–2) | 4.8 | ||||
| HC18O+ | t = 106 yr, AV = 1 | 6.0 | 0.18 | (1–0) | 5.5 |
| (1–0) | 7.8 | ||||
| DCO+ | t = 106 yr, AV = 1 | 0.5 | 2.5 | (2–1) | 5.8 |
| (3–2) | 5.7 | ||||
Notes. (a) Column density predicted by MOLLIE at the dust peak, computed integrating the molecular abundance, multiplied by the H2 volume density, along the line of sight and convolving to the beam size of the observation. (b) Excitation temperaturevalues for each line derived as described in the main text and used to derive the column density maps. (c) The transitions are labelled with the rotational convention (J-J′), even when asingle hyperfine component is used.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.