arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.00650astro-ph.EP
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根据四年MESSENGER X射线光谱仪观测的全球汞主元素图

Global Major-Element Maps of Mercury from Four Years of MESSENGER X-Ray Spectrometer Observations

Larry R. Nittler, Elizabeth A. Frank, Shoshana Z. Weider, Ellen Crapster-Pregont, Audrey Vorburger, Richard D. Starr, Sean C. Solomon

备注：
Accepted for publication by Icarus. 38 pages, 10 figures in main text, plus 6 supplemental figures
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摘要：

信使号航天器上的X射线光谱仪提供了水星表面主要元素比率的测量结果。我们提出了全球地图的Mg/Si，Al/Si，S/Si，Ca/Si和Fe/Si来自XRS数据收集整个信使号的轨道任务。我们描述的程序，我们用来选择和过滤数据，并结合它们，使最终的地图，这是在美国宇航局的行星数据系统存档。面积覆盖率是可变的不同的元素比的地图，与100%的覆盖率为Mg/Si和Al/Si，但只有18%的覆盖率为Fe/Si以北的30 $^{\circ}$ N，其中的空间分辨率是最高的。空间分辨率比以前的地图提高了10-15%，因为在航天器近心点高度较低的任务后期包含了更高分辨率的数据。然而，与典型的行星数据地图不同，XRS地图的空间分辨率可能因像素而异，因此在解释小尺度特征时必须小心。我们提供了几个例子，如何XRS地图可用于调查元素的变化的背景下，对水星的地质特征，其范围从单一的$\sim$ 100公里直径的陨石坑，以大的影响盆地的大小。我们希望这些地图将为未来许多年的水星起源和地质历史研究提供基础和/或做出贡献。

英文摘要：

The X-Ray Spectrometer (XRS) on the MESSENGER spacecraft provided measurements of major-element ratios across Mercury's surface. We present global maps of Mg/Si, Al/Si, S/Si, Ca/Si, and Fe/Si derived from XRS data collected throughout MESSENGER's orbital mission. We describe the procedures we used to select and filter data and to combine them to make the final maps, which are archived in NASA's Planetary Data System. Areal coverage is variable for the different element-ratio maps, with 100% coverage for Mg/Si and Al/Si, but only 18% coverage for Fe/Si north of 30 $^{\circ}$ N, where the spatial resolution is highest. The spatial resolution is improved over previous maps by 10-15% because of the inclusion of higher-resolution data from late in the mission when the spacecraft periapsis altitude was low. Unlike typical planetary data maps, however, the spatial resolution of the XRS maps can vary from pixel to pixel, and thus care must be taken in interpreting small-scale features. We provide several examples of how the XRS maps can be used to investigate elemental variations in the context of geological features on Mercury, which range in size from single $\sim$100-km-diameter craters to large impact basins. We expect that these maps will provide the basis for and/or contribute to studies of Mercury's origin and geological history for many years to come.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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