Table 2
Standard deviation of the brightness temperature in the HIFI spectra calculated for each spectrometer using the native spectral resolution, line intensities, line velocity shifts and retrieved H2O and NH3 production rates in comet C/2006 W3 (Christensen).
| Molecule | Spec. | σ T mB a |
|
Δv b | Q c |
| (mK) | (mK Km s-1) | (m s-1) | (molec s-1) | ||
|
|
|||||
| H2O | WBS | 1.5 | 11.4 ± 3.5 | −71 ± 40 | 1.7 ± 0.5 × 1027 |
| HRS | 6.3 | 16.2 ± 4.6 | −77 ± 67 | 2.3 ± 0.7 × 1027 | |
|
|
|||||
| NH3 | WBS | 1.5 | <13 | < 1.5 × 1027 | |
| HRS | 6.3 | <17 | < 1.9 × 1027 | ||
Notes.
The velocity of the line centroids are computed using the spectra with the original frequency resolution of 500 kHz and 60 kHz for WBS and HRS.
Production rates or 3σ upper limits are derived for a gas kinetic temperature of 15 K, expansion velocity of 0.4 km s-1, both values being derived by scaling observations obtained at 3.3 AU from the Sun with the IRAM 30-m telescope, and an electron density scaling factor of xne = 0.2 (see Paper I, and references therein).
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