arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.1319astro-ph.IM
收藏

超大望远镜上的spectroscopy策略。II -不同字段spectroscopy

Strategies for spectroscopy on Extremely Large Telescopes. II - Diverse field spectroscopy

G. J. Murray, J. R. Allington-Smith

摘要:

由于其自适应光学系统在宽视场内接近衍射极限,因此极大望远镜的视场将包含大量的空间采样元件(spaxels)。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。我们说明了这种多样的场光谱(DFS)的星系组装的宇宙学研究的效用。我们展示了如何实现DFS与仪器的概念:天体的。它集成了高度多路复用的单片光纤系统(MFS)和目前电信行业中可用的交换网络类型。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,我们将通过改变输入输出映射来研究这种系统的优化。

英文摘要:

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 maximised if the sampling pattern provides an adaptable combination of separated independent spaxels and larger contiguous sub-fields, 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 (MFS) 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 optimisation of such systems by varying the input-output mapping.

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。

↑