Table 2
Line parameters for the 3 mm molecular lines used in the analysis.
| Transition | Rest frequency | Eup | ncrit |
|---|---|---|---|
| (GHz) | (K) | (cm−3) | |
| HC3N (9–8) | 81.881 | 19.6 | 5.6×104 |
| CS (2–1) | 97.980 | 7.1 | 8.9×104 |
| H13CO+ (1–0) | 86.754 | 4.2 | 3.5×104 |
| CH3OH 2−1,1–1−1,0 E | 96.755 | 28.0 | 2.2×105 |
| CH3CCH 50–40 | 85.457 | 12.3 | 2.8×103 |
| CH3CCH 63–53 | 102.530 | 82.0 | 4.0×103 |
| CCH 12,2–01,1 | 87.407 | 4.2 | 9.3×103 |
| SO 32–21 | 99.299 | 9.2 | 4.3×104 |
| SiO (2–1) | 86.846 | 6.3 | 4.8×104 |
| H2CS 30,3–20,2 | 103.040 | 9.9 | 3.0×104 |
| H2CS 32,1 –22,0 | 103.051 | 62.6 | 1.1×104 |
| NH2D 11,1–10,1 | 85.926 | 20.7 | 4.3×104 |
Notes. Line frequencies are taken from Cologne Database for Molecular Spectroscopy (CDMS) database (Endres et al. 2016). The critical density ncrit is calculated assuming a gas kinetic temperature of 30 K with no optical depth correction. The references of collisional rates for HC3N is Faure et al. (2016), for SiO is Balança et al. (2018), for H2CS is Wiesenfeld & Faure (2013), and for NH2D Daniel et al. (2014).
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.