Table 2
Observed molecular transitions.
| Molecule | Transition | Rest frequency (GHz) | Beam size (″) | Eu/k (K) | E1/k (K) | Aul (s−1) |
|---|---|---|---|---|---|---|
| HCO+ | J = 1 ← 0 | 89.1885 | 27.6 | 4.28 | 0.0 | 4.19 × 10−5 |
| HCN | J = 1 ← 0, F = 1 ← 1 | 88.6304 | 27.8 | 4.25 | 0.0 | 2.41 × 10−5 |
| J = 1 ← 0, F = 2 ← 1(†) | 88.6318 | 27.8 | 4.25 | 0.0 | 2.41 × 10−5 | |
| J = 1 ← 0, F = 0 ← 1 | 88.6339 | 27.8 | 4.25 | 0.0 | 2.41 × 10−5 | |
| HNC | J = 1 ← 0 | 90.6635 | 27.1 | 4.35 | 0.0 | 2.69 × 10−5 |
| CS | J = 2 ← 1 | 97.9809 | 25.1 | 7.05 | 2.35 | 1.68 × 10−5 |
| H2S | JKa, Kc = 11,0 ← 10,1 | 168.7627 | 14.6 | 8.10 | 0.0 | 2.68 × 10−5 |
| C2H | N = 1 ← 0, J = 3/2 ← 1/2, F = 1 ← 1 | 87.2841 | 28.2 | 4.19 | 0.0 | 2.60 × 10−7 |
| N = 1 ← 0, J = 3/2 ← 1/2, F = 2 ← 1(†) | 87.3168 | 28.2 | 4.19 | 0.0 | 1.53 × 10−6 | |
| N = 1 ← 0, J = 3/2 ← 1/2, F = 1 ← 0 | 87.3285 | 28.2 | 4.19 | 0.0 | 1.27 × 10−6 | |
| N = 1 ← 0, J = 1/2 ← 1/2, F = 1 ← 1 | 87.4019 | 28.1 | 4.20 | 0.0 | 1.27 × 10−6 | |
| N = 1 ← 0, J = 1/2 ← 1/2, F = 0 ← 1 | 87.4071 | 28.1 | 4.20 | 0.0 | 1.54 × 10−6 | |
| N = 1 ← 0, J = 1/2 ← 1/2, F = 1 ← 0 | 87.4464 | 28.1 | 4.20 | 0.0 | 2.61 × 10−7 | |
| c-C3H2 | JKa,Kc = 21,2 ← 10,1 | 85.3388 | 28.8 | 4.10 | 0.0 | 2.32 × 10−5 |
Notes. The dagger(†) marks the reference frequency corresponding to the reference velocity (υsys) for a given sightline. The spectroscopic information on these transitions is taken from Jet Propulsion Laboratory (JPL) (https://spec.jpl.nasa.gov/) and the Cologne Database for Molecular Spectroscopy (CDMS) (https://cdms.astro.uni-koeln.de/) catalogs. The frequencies of H2S and c-C3H2 transitions correspond to that of their ortho spin state, and so the subsequently derived column densities and abundances for these species refer to ortho-H2S and ortho-c-C3H2 The upper energy levels of ortho-H2S and ortho-c-C3H2 listed in the table are relative to the ground state of the orhto species; without that, for ortho-H2S, Eu/k = 27.88 K and El/k = 19.78 K, and for ortho-c-C3H2, Eu/k = 6.45 K and El/k = 2.35 K.
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