Open Access
Table 1
Observed molecule, transition, frequency, critical density (ncrit), half power beam width (HPBW), main beam efficiency (ηMB), velocity resolution (Δv), and root mean square noise (rms).
| Molecule | Transition | Frequency (MHz) | ncrit (cm−3) | Receiver | HPBW (″) | ηMB | Δv (m s−1) | rms (mK) |
|---|---|---|---|---|---|---|---|---|
| N2H+ | J = 3–2 | 279511.832 | 1.5 × 106 | SEPIA345 | 22 | 0.77 | 65 | 40 |
| J = 5–4 | 465824.947 | 5.6 × 106 | nFLASH460 | 13 | 0.61 | 39 | 40 | |
| N2D+ | J = 3–2 | 231321.828 | 7.5 × 105 | nFLASH230 | 27 | 0.81 | 79 | 15 |
| J = 4–3 | 308422.294 | 1.6 × 106 | SEPIA345 | 20 | 0.74 | 59 | 32 | |
| J = 6–5 | 462603.932 | 3.8 × 106 | nFLASH460 | 13 | 0.61 | 39 | 37 |
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