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Table 6
Source-averaged molecular column density (Ntot), gas physical conditions (temperature, Tkin, and density, nH_2), source size inferred from the LVG analysis, and beam-filling factor (ηbf) of c-C3H2, CH3OH, and CH3CN lines towards the four protostars in our sample (L1489-IRS, B5-IRS1, L1455-IRS1, and L1551-IRS5).
| Species | Nlines | Eup | Tkin | Ntot |  |
Source size | ηbf |
|---|---|---|---|---|---|---|---|
| (K) | (K) | (cm−2) | (cm−3) | (′′) | |||
| L1489-IRS | |||||||
| c-C3H2 | 4 | 19−39 | 5−25 | 1 × 1012–3 × 1015 | 8 × 104–3 × 106 | 2–5 | 0.03–0.17 |
| B5-IRS1 | |||||||
| c-C3H2 | 4 | 19−39 | 15−18 | 1−30 × 1014 | 1−30 × 104 | 2–3 | 0.03–0.07 |
| L1455-IRS1 | |||||||
| c-C3H2 | 4 | 19−39 | 10−25 | 1−50 × 1013 | 8 × 104–5 × 106 | 3–10 | 0.07–0.45 |
| L1551-IRS5 | |||||||
| c-C3H2 | 4 | 19−39 | 15−20 | 3 × 1013–1 × 1015 | 1 × 104–3 × 106 | 4–8 | 0.12–0.35 |
| CH3OH | 7 | 45−190 | 50−105 | 1−6 × 1018 | 0.5−30 × 106 | 0.14–0.18 | 1.6−2.6 × 10−4 |
| CH3CN | 4 | 68−133 | 105−135 | ≥× 1017 | ≥3 × 104 | 0.11–0.20 | 1.0−3.3 × 10−4 |
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