Strategies for spectroscopy on Extremely Large Telescopes – II. Diverse-field spectroscopy
Strategies for spectroscopy on Extremely Large Telescopes – II. Diverse-field spectroscopy
复制标题
超大望远镜的光谱策略 - II。
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Allington
中科院分区：
文献类型：
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作者：
Graham J. Murray;J. Allington
极大望远镜的视场将包含大量的空间采样元件（spaxels），因为它们的自适应光学系统在宽视场上接近衍射极限。由于这将超过任何现实仪器的检测能力，因此必须对该场进行稀释采样，以从所选的感兴趣区域提取光谱数据。如果采样模式提供分离的独立spaxels和更大的连续子场的适应性组合，无缝结合积分场和多目标光谱，科学回报将最大化。我们举例说明了这种分集场光谱（DFS）的星系组装宇宙学研究的效用。我们展示了如何实现DFS与仪器的概念：天体的。这集成了高度多路复用的单片光纤系统和目前在电信工业中可用的类型的交换网络。它避免了笨重的运动部件，其局限性在论文I中已经指出。在论文III中，我们将研究通过改变输入输出映射来优化这样的系统。
The fields of view of Extremely Large Telescopes will contain vast numbers of spatial sampling elements (spaxels) as their adaptive optics systems approach the diffraction limit over wide fields. Since this will exceed the detection capabilities of any realistic instrument, the field must be dilutely sampled to extract spectroscopic data from selected regions of interest. The scientific return will be maximized if the sampling pattern provides an adaptable combination of separated independent spaxels and larger contiguous subfields, seamlessly combining integral-field and multiple-object spectroscopy. We illustrate the utility of this diverse-field spectroscopy (DFS) to cosmological studies of galaxy assembly. We show how to implement DFS with an instrument concept: the Celestial Selector. This integrates highly multiplexed monolithic fibre systems and switching networks of the type currently available in the telecommunications industry. It avoids bulky moving parts, whose limitations were noted in Paper I. In Paper III, we will investigate the optimization of such systems by varying the input–output mapping.