麦哲伦红外多目标光谱仪（MIRMOS）切片式积分视场单元的更新
Update on the slicer IFU for the Magellan InfraRed Multi-Object Spectrograph (MIRMOS)
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中文总结 AI 辅助
介绍麦哲伦红外多目标光谱仪MIRMOS切片式积分视场单元更新。原重成像式切片器有局限，现改用虚拟式IFU，通过将其移至仪器更深处实现，降低成本且无需自由曲面，还介绍了新IFU光学设计、性能及光机系统概念设计。
中文摘要 AI 辅助
麦哲伦红外多目标光谱仪（MIRMOS）是计划用于智利拉斯坎帕纳斯天文台6.5米麦哲伦望远镜的下一代多目标和积分视场光谱仪。它除了在0.7 - 0.886微米范围内成像外，还将在0.886 - 2.404微米（Y、J、H、K波段）的同时波长范围内进行R~3700光谱观测。其积分视场模式将通过位于线性平台上的图像切片式积分视场单元（IFU）实现。IFU将提供一个由0.84''×26''切片组成的约18''×26''视场，是在这些波长下地面或空间运行的最大视场积分视场光谱仪。此前采用重成像式切片器，现为降低成本并解耦多目标模式下的IFU与可配置狭缝单元，将IFU移至仪器更深处，改用虚拟式IFU，无需自由曲面。本文介绍了新MIRMOS IFU的光学设计、预测性能及光机系统概念设计。
英文摘要
The Magellan InfraRed Multi-Object Spectrograph (MIRMOS) is a planned next generation multi-object and integral field spectrograph for the 6.5m Magellan telescopes at Las Campanas Observatory in Chile. MIRMOS will perform $\rm R\sim3700$ spectroscopy over a simultaneous wavelength range of 0.886 - 2.404um (Y, J, H, K bands) in addition to imaging over the range of 0.7 - 0.886um. The integral field mode of operation for MIRMOS will be achieved via an image slicer style integral field unit (IFU) located on a linear stage to facilitate movement into the beam during use or storage while operating in multi-object mode. The IFU will provide an $\rm\sim18''\times26''$ field of view (FoV) made up of $\rm0.84''\times26''$ slices. This will be the largest FoV IFS operating at these wavelengths from either the ground or space, making MIRMOS an ideal instrument for a wide range of science cases including studying the high redshift circumgalactic medium and emission line tracers from ionized and molecular gas in nearby galaxies. We present here an update on the IFU design from our 2024 proceeding. Previously we utilized a re-imaging style slicer which required freeform pupil mirrors in order to achieve the required image quality while obeying significant packaging constraints near the instrument focal surface. In order to reduce the manufacturing cost and decouple the IFU from the configurable slit unit used in multi-object mode, we have moved the IFU deeper into the instrument, allowing for a switch to a virtual style IFU. This now requires a re-imaging doublet before the slicer mirrors, but removes the need for any freeform surfaces. We present here the optical design and predicted performance of the new MIRMOS IFU along with a conceptual design for the opto-mechanical system which will move the IFU between its active and stored positions.
