Table 3
Best-fit parameters for the Gaussian fits of each component in each spectrum, along with the resultant NTOT and calculated NTOT and D/H ratios.
| Species | Size (″) | Tex(K) | VLSR (km s−1) | FWHM (km s−1) | NTOT (cm−2) | NTOT/NTOT(H2CO) (%) | D/H ratio |
|---|---|---|---|---|---|---|---|
| 0.15 |  |
−1.2±0.1 | 3.5±0.1 |  |
 |
 |
|
| 0.50 |  |
3.4±0.1 | 3.9±0.1 |  |
 |
 |
|
| 0.15 | 90 | 10±1 | 5.0±0.5 |  |
 |
 |
|
| 0.15 | <13 | 3.6 | 0.40 | <1.8 × 1011 (a) | <0.3 | <1.7 × 10−3 | |
| HDCO(b) | |||||||
| 0.30 | 96±3 | −1.2±0.1 | 3.5±0.1 |  |
 |
 |
|
| 1.00 |  |
3.4±0.1 | 3.9±0.1 |  |
 |
 |
|
| 0.30 | 90 | 10±1 | 5.0±0.5 |  |
 |
 |
|
| 0.30 | <13 | 3.6 | 0.40 | <6.6 × 1011 (a) | <1.3 | <6.6×10−3 | |
| 90 | −1.2 | 3.5 |  |
||||
| 90 | 3.4 | 3.9 |  |
||||
| H2CO(c)(d) | |||||||
| 90 | 9.1 | 5.1 |  |
||||
| 13(e) | 3.6±0.4 | 0.40±0.01 | < 6 × 1013 | ||||
| 0.30 | 90 | 2.1±0.3 | 2.8±0.6 |  |
|||
| D2CO(b)(c)(f) | |||||||
| 1.00 | 90 | 2.1±0.3 | 2.8±0.6 |  |
|||
Notes. (a) Upper limit NT0T for absorption in HDCO was obtained by fixing VLSR and FWHM using the H2CO absorption component and noting maximum Tex.(b) The HDCO and D2CO values have been corrected for beam dilution.(c) Tex was fixed to 90 K to model the emission components of H2CO and D2CO using the Tex obtained for HDCO.(d) The FWHM and VLSR values for H2CO were fixed using the values obtained for HDCO. (e) An excitation temperature of 13 K for the envelope was used to model the absorption feature in H2CO.(f) The FWHM and VLSR values for D2CO were fixed using L–M single Gaussian fitting.
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