Table 1
Basic information on the CO rotational lines and [C I] 3P fine structure lines used in this paper.
Molecule | Transition | νrest | Eup/k | AUL | ncrit |
JU → JL | (GHz) | (K) | (s-1) | (cm-3) | |
|
|||||
CO | 1 → 0 | 115.271 | 5.5 | 7.20 × 10-8 | 2.4 × 102 |
2 → 1 | 230.538 | 16.6 | 6.91 × 10-7 | 2.1 × 103 | |
3 → 2 | 345.796 | 33.2 | 2.50 × 10-6 | 7.6 × 103 | |
4 → 3 | 461.041 | 55.3 | 6.12 × 10-6 | 1.8 × 104 | |
5 → 4 | 576.268 | 83.0 | 1.22 × 10-5 | 3.6 × 104 | |
6 → 5 | 691.473 | 116.2 | 2.14 × 10-5 | 6.3 × 104 | |
7 → 6 | 806.652 | 154.9 | 3.42 × 10-5 | 1.0 × 105 | |
8 → 7 | 921.800 | 199.1 | 5.13 × 10-5 | 1.5 × 105 | |
9 → 8 | 1036.912 | 248.9 | 7.33 × 10-5 | 2.1 × 105 | |
10 → 9 | 1151.985 | 304.2 | 1.00 × 10-4 | 2.9 × 105 | |
11 → 10 | 1267.014 | 365.0 | 1.34 × 10-4 | 3.9 × 105 | |
|
|||||
[C I] | 3P1 → 3P0 | 492.161 | 23.6 | 7.88 × 10-8 | 4.9 × 102 |
3P2 → 3P1 | 809.342 | 62.4 | 2.65 × 10-7 | 9.3 × 102 |
Notes. Critical density ncrit,UL ≡ AUL/ Σi ≠ UγUi (e.g. Tielens 2005). AUL is the Einstein coefficient for spontaneous emission from level U to L, and γUi is the collision rate coefficient. The critical densities (ncrit) are calculated by assuming a gas temperature Tk = 100 K, and an ortho-H2 to para-H2 ratio of 3 and an optically thin regime. The rest-frame frequencies (νrest), upper-level energies (Eup/k) and Einstein A coefficients are taken from the LAMDA database (Schöier et al. 2005). The collision rate coefficients are from Yang et al. (2010). Throughout this paper, we refer to [C I](3P1 → 3P0) as [C I](1–0) and [C I](3P2 → 3P1) as [C I](2–1).
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.