Table I.1.
H2O and CO2 line-of-sight column densities in selected Ganymede’s areas.
| Regiona | H2O band area (1-σ)b | H2O band area (1-σ)c | N(H2O) (3σ)d | N(H2O) (3σ)d | N(CO2)f |
|---|---|---|---|---|---|
| λ < 6.2 μm | λ > 6.2 μm | Trot = 105 K | Trot = 130 K | Trot = 105 K | |
| (W m−2 sr−1) | (W m−2 sr−1) | (m−2) | (m−2) | (m−2) | |
| Leading CO2 source | < 3.1 10−8 | < 1.0 10−7 | < 2.0 1019 | – | 1.0 1018 |
| Leading SZA< 15° | < 4.7 10−8 | < 2.2 10−7 | < 6.8 1019 | < 1.7 1020 | < 1.9 1017 |
| Trailing SZA< 15° | < 6.8 10−8 | < 3.4 10−7 | < 3.1 1019 | < 4.6 1019 | < 2.5 1017 |
a Using extracted spectra from either the subsolar region (Solar Zenith Angle SZA < 15°, average of 8 pixels for MIRI, 27 pixels for NIRSpec) or from the region with large CO2 gas emission (leading, 40–65°N, 46-100°W, 7 pixels for MIRI, 15 pixels for NIRSpec). b Using the most intense 10–15 ro-vibrational lines expected in absorption in the 5.7–6.2 μm spectral range. c Using the most intense 10–15 ro-vibrational lines expected in emission in the 6.2-7.1 μm spectral range. d 3σ upper limits on H2O line-of-sight column density combining upper limits obtained for the two spectral ranges (< 6.2 μm and > 6.2 μm). f Upper limits are 3σ.
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