Table 1
Spectral properties of the observed lines.
| Species | Quantum numbers | Frequency | s(a) | Noise(b) | |
|---|---|---|---|---|---|
| Simplified | Complete | [MHz] | # | [K] | |
| 12CO | (1–0) | J = 1 → 0 | 115 271.202 | 1 | 0.11 |
| 13CO | (1–0) | J = 1 → 0 | 110 201.354 | 1 | 0.04 |
| C18O | (1–0) | J = 1 → 0 | 109 782.173 | 1 | 0.04 |
| C17O | (1–0) | J = 1 → 0 | 112 358.982 | 1 | 0.06 |
| H2CO | (1–0) | 10,1 → 00,0 | 72 837.948 | 3 | 0.11 |
| HCO+ | (1–0) | J = 1 → 0 | 89 188.525 | 3 | 0.05 |
| HC13O+ | (1–0) | J = 1 → 0 | 86 754.288 | 3 | 0.06 |
| HCN | (1–0) | J = 1 → 0, F = 2 → 1 | 88 631.848 | 3 | 0.06 |
| HNC | (1–0) | J = 1 → 0 | 90 663.568 | 3 | 0.06 |
| 12CN | (1–0) | N = 1 → 0, J = 3∕2 → 1∕2, F = 5∕2 → 3∕2 | 113 490.970 | 1 | 0.07 |
| 12CS | (2–1) | J = 2 → 1 | 97 980.953 | 1 | 0.04 |
| 32SO | (3–2) | J = 3 → 2, N = 2 → 1 | 99 299.870 | 1 | 0.04 |
| CCH | (1–0) | N = 1 → 0, J = 3∕2 → 1∕2, F = 2 → 1 | 87 316.898 | 2 | 0.05 |
| c-C3H2 | (2–1) | 21,2 → 10,1 | 85 338.890 | 2 | 0.04 |
| N2H+ | (1–0) | J = 1 → 0, F1 = 2 → 1, F = 3 → 2 | 93 173.764 | 3 | 0.05 |
| CH3OH | (2–1) | J = 2 → 1, K = 0 → 0, (A+) | 96 741.375 | 1 | 0.04 |
| SiO | (2–1) | J = 2 → 1 | 86 846.985 | 1 | 0.06 |
| H+ | 40α | 40α recombination line | 99 022.953 | 1 | 0.02 |
Notes. (a) Number of the IRAM-30 m tuning setup the line was observed with (see Sect. 2.1 for details). (b) Typical noise level in channels of 0.5 km s−1 measured on the cubes that were smoothed at an angular resolution of 40″.
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