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Table 4
DCO+ intensities and line ratios, with inferred temperature and density.
| Source | IRAS 16293−2422 | VLA 1623−2417 – ALMA | VLA 1623−2417 – APEX | |||
| Transition | 5–4 (ACA) | 3–2 (SMA) | 5–4 | 3–2 | 5–4 | 3–2 |
| Line width (km s−1) | 1.0 | 1.0 | 0.6 | 0.6 | 0.7 | 0.7 |
| Beam (arcsec) | 5.25 × 2.36 | 4.11 × 2.45 | 0.87 × 0.65 | 0.85 × 0.54 | 17.3 | 28.9 |
| Peak (Jy beam−1) | 3.8 ± 0.6 | 1.9 ± 0.2 | 0.29 ± 0.02 | 0.087 ± 0.008 | ... | ... |
| Peak (K) | 2.9 ± 0.4 | 4.9 ± 0.6 | 4.8 ± 0.3 | 4.9 ± 0.5 | 0.79 ± 0.1a | 4.8 ± 0.1 |
| Line ratio | 0.6 ± 0.1 | 1.0 ± 0.1 | 0.2 ± 0.03 | |||
| Column density (cm−2) | 3 × 1012 | 2 × 1012 | 2 × 1012 | |||
| H2 density (cm−3) | 1–8 × 107 | 2–6 × 106 | 1–6 × 106 | |||
| Kinetic temperature (K) | 20–23 | 30–55 | 12–19 | |||
| τ | <1 | <1 | <1 | |||
Notes. (a)Peak temperature with beam dilution factor applied to DCO+ 5–4 (see Appendix C), taking the beam to be 17.3′′, and source 28.9′′.
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