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Table 2
Observed lines.
| Species | Transition | Frequency | A | N/∫ τdva |
|---|---|---|---|---|
| MHz | 10−5 s−1 | 1012 cm−2/km s−1 | ||
| HCO+ | 1–0 | 89188.525 | 4.19 | 1.11 |
| HOC+ | 1–0 | 89487.414 | 2.13 | 2.19 |
| CF+b | 1–0 | 102587.533 | 0.48 | 13.5 |
| C3H+ | 4–3 | 89957.625 | 3.39 | 16.2 |
| c-C3H | 2(1, 2)5∕2, 3−1(1, 1)3∕2, 2 | 91494.349 | 1.55 | 14.3 |
| 13CS | 2–1 | 92494. 257 | 1.18 | 9.72 |
| HCNb | 1–0 | 88631.601 | 2.41 | 1.91 |
| HNC | 1–0 | 90663.564 | 2.69 | 1.78 |
| NH2CHOb | 2(1, 2)−1(0, 1) | 102217.572 | 0.27 | 114 |
Notes. (a) For an excitation temperature equal to the CMB, 2.725 K, (b)for the combined hyperfine components. A recent determination of the rest frequency has been published by Stoffels et al. (2016).
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