论文标题
经彩态校正的全球红甲壳镶嵌：对其光谱多样性和地质活动的新含义
Photometrically-corrected global infrared mosaics of Enceladus: New implications for its spectral diversity and geological activity
论文作者
论文摘要
在2004年至2017年之间，除了更遥远的调查外，在23次Exceladus近距离相遇期间，视觉和红外映射光谱仪（VIM）在板载Cassini（Brown等，2004）收集了光谱观测。本研究的目的是生成全球高光谱镶嵌于整个Ecceladus的数据集，以突出不同地质单元之间的光谱变化。这需要在空间分辨率和照明条件方面选择最佳观察结果。我们已经对几个关键波长（1.35、1.5、1.65、1.8、2.0、2.25、2.55、2.55、2.55和3.6 $ $ m）的光度法进行了详细研究。我们根据Shkuratov等人的模型提出了一种新的光度函数。 （2011）。合并后，在不同波长处进行校正的镶嵌物揭示了异质区域，特别是在南极的老虎条纹周围和北半球周围的地形左右，大约30°N，90°W。这些区域似乎主要与构造单位相关，表明内源性起源可能是由海底热点驱动的。
Between 2004 and 2017, spectral observations have been gathered by the Visual and Infrared Mapping Spectrometer (VIMS) on-board Cassini (Brown et al., 2004) during 23 Enceladus close encounters, in addition to more distant surveys. The objective of the present study is to produce a global hyperspectral mosaic of the complete VIMS data set of Enceladus in order to highlight spectral variations among the different geological units. This requires the selection of the best observations in terms of spatial resolution and illumination conditions. We have carried out a detailed investigation of the photometric behavior at several key wavelengths (1.35, 1.5, 1.65, 1.8, 2.0, 2.25, 2.55 and 3.6 $μ$m), characteristics of the infrared spectra of water ice. We propose a new photometric function, based on the model of Shkuratov et al. (2011). When combined, corrected mosaics at different wavelengths reveal heterogeneous areas, in particular in the terrains surrounding the Tiger Stripes on the South Pole and in the northern hemisphere around 30°N, 90°W. Those areas appear mainly correlated to tectonized units, indicating an endogenous origin, potentially driven by seafloor hotspots.
