Open Access
Table 1
Observed transitions.
| Transition | Frequency(†) | Eu | ncrit(H2)(*) |
|---|---|---|---|
| (MHz) | (K) | (cm−3) | |
| oH2D+(110 −111) | 372421.3558(a) | 104.3 | 1.3 × 105 |
| N2H+(4 − 3) | 372672.4518(b) | 44.7 | 3.2 × 106 |
| DCO+(5 − 4) | 360169.7783(c) | 51.9 | 3.3 × 106 |
Notes. (†)The frequencies are adopted from (a)Jusko et al. (2017); (b)Pagani et al. (2009a); (c)Lattanzi et al. (2007). (*)At 10 K according to Eq. (4) of Shirley (2015), using the collision rate coefficients computed by Hugo et al. (2009), Schöier et al. (2005), and Denis-Alpizar et al. (2020).
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