Table 2
Observed parameters of the H13CO+, HN13C and SiO lines.
| NGC 1333 | L1448-IRS3 | VLA 1623 | IRAS 20353 | |||||||||
| Line | νlsr | Δν |
|
νlsr | Δν |
|
νlsr | Δν |
|
νlsr | Δν |
|
| (km s-1) | (km s-1) | (K) | (km s-1) | (km s-1) | (K) | (km s-1) | (km s-1) | (K) | (km s-1) | (km s-1) | (K) | |
|
|
||||||||||||
| H13CO+ (1 → 0) | 6.94(2) | 0.94(4) | 0.696(9) | 4.1090(5) | 0.805(9) | 0.91(2) | 2.57(2) | 0.60(5) | 0.60(5) | 2.637(4) | 0.56(1) | 0.97(1) |
| 7.80(1) | 0.71(2) | 1.022(9) | 4.641(2) | 0.736(6) | 2.00(2) | 3.467(5) | 0.74(1) | 2.61(5) | 3.00(3) | 0.54(9) | 0.11(1) | |
| 5.231(4) | 0.746(9) | 0.72(2) | ||||||||||
| H13CO+ (4 → 3) | 6.91(2) | 0.84(7) | 0.29(1) | 3.97(4) | 1.00(8) | 0.14(2) | 2.6(1) | 0.9(4) | 0.17(5) | 2.62(5) | 0.4(1) | 0.051(4) |
| 7.81(9) | 0.6(2) | 0.06(1) | 4.73(2) | 0.75(3) | 0.39(2) | 3.35(2) | 1.1(2) | 0.47(5) | ~3.1 | ... | ≤0.027 | |
| 5.437(7) | 0.72(6) | 0.20(2) | ||||||||||
| HN13C (1 → 0) | 6.87(3) | 0.84(7) | 0.24(1) | 4.0(1) | 0.5(1) | 0.16(1) | ~2.6 | ... | ≤0.044 | 2.66(2) | 0.49(3) | 0.46(1) |
| 7.90(2) | 0.87(4) | 0.38(1) | 4.7(1) | 0.9(1) | 0.97(1) | 3.58(2) | 0.71(6) | 0.42(4) | 3.1(1) | 0.7(2) | 0.13(2) | |
| 5.5(1) | 0.7(1) | 0.20(1) | ||||||||||
| HN13C (4 → 3) | ~6.9 | ... | ≤0.032 | ~4.0 | ... | ≤0.032 | ~2.6 | ... | ≤0.13 | ~2.6 | ... | ≤0.040 |
| ~7.8 | ... | ≤0.032 | ~4.7 | ... | ≤0.032 | ~3.5 | .... | ≤0.13 | ~3.1 | ... | ≤0.040 | |
| ~5.4 | ... | ≤0.032 | ||||||||||
| SiO (2 → 1) | 7.1(2) | 3.4(4) | 0.10(2) | ~4.0 | ... | ≤0.019 | 2.9(1) | 1.3(3) | 0.08(2) | ~2.6 | ... | ≤0.034 |
| 7.83(1) | 0.63(4) | 0.31(2) | 4.545(4) | 0.499(9) | 0.36(1) | ... | ... | ... | ~3.1 | ... | ≤0.034 | |
| ~5.4 | ... | ≤0.019 | ||||||||||
| SiO (8 → 7) | ~6.9 | ... | ≤0.031 | ~4.0 | ... | ≤0.033 | ~2.6 | ... | ≤0.049 | |||
| ~7.8 | ... | ≤0.031 | ~4.7 | ... | ≤0.033 | ~3.1 | ... | ≤0.049 | ||||
| ~5.4 | ... | ≤0.033 | ||||||||||
Notes. For the peak intensity, , the
number in brackets shows the estimated error on the last digit, estimated by the
1σ noise level. For the position, νlsr, and linewidth,
Δν, the errors on the last digit quoted are the values given by the fitting routine
“minimize” in the CLASS analysis software, which may underestimate the true errors as
they do not take into account, for example, uncertainties in the inputs to the fitting
routine. The upper limits of the line intensities correspond to the
3σ noise level in the spectra when smoothed to a velocity
resolution of ~0.2 km s-1. At this velocity resolution there should be
3–4 channels contained within the line, which should be sufficient to estimate the
peak intensity.
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