木卫二上一个新的UV光谱特征：主半球混沌地形中NaCl的确认
A New UV Spectral Feature on Europa: Confirmation of NaCl in Leading-hemisphere Chaos Terrain
摘要：
最近用哈勃太空望远镜对木卫二表面进行的可见光波长观测显示，在450 nm附近存在一个吸收特征，该特征在空间上与领先的半球混沌地形相关。这一特征被解释为反映了最终来源于内部的辐照氯化钠的存在。在这里，我们使用哈勃太空望远镜收集的紫外光谱来检测230 nm附近的一个额外的先前看不见的吸收，该吸收在空间上与450 nm特征和相同的领先半球混沌地形相关。我们发现，新的紫外线功能也很好地匹配辐照氯化钠在欧罗巴样条件。氯化钠在地质上年轻的地区的这种确认对木卫二的地下成分有重要的影响。
英文摘要：
Recent visible-wavelength observations of Europa's surface obtained with the Hubble Space Telescope revealed the presence of an absorption feature near 450 nm that appears spatially correlated with leading-hemisphere chaos terrain. This feature was interpreted to reflect the presence of irradiated sodium chloride ultimately sourced from the interior. Here, we use ultraviolet spectra also collected with the Hubble Space Telescope to detect an additional previously unseen absorption near 230 nm, which spatially correlates with the 450 nm feature and with the same leading-hemisphere chaos terrain. We find that the new ultraviolet feature is also well-matched by irradiated sodium chloride at Europa-like conditions. Such confirmation of sodium chloride within geologically young regions has important implications for Europa's subsurface composition.
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