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• W3089431115 abstract "Abstract The Faint Object Camera and Spectrograph (FOCAS) is an optical imaging and spectroscopy instrument for the Subaru Telescope. It has been a workhorse instrument since the first-light phase of the telescope. We describe an integral field unit (IFU) that has recently been installed in FOCAS. The IFU utilizes an image slicer that divides a ${13{^{prime prime }_{.}}5}$ × ${10{^{prime prime }_{.}}0}$ field of view into 23 stripes, with a width of ${0{^{prime prime }_{.}}435}$. A sky spectrum separated from an object by approximately ${5{^{prime }_{.}}2}$ can be obtained at the same time as an object spectrum. Test observations confirmed that the image quality of the IFU does not degrade the ${0{^{prime prime }_{.}}435}$ sampling, and that slice width and length are consistent with the design. Highly reflective multilayer dielectric coatings were coated on all the mirrors in the IFU, thereby offering a high mean IFU throughput of ∼85% over the field. However, the outer part of the field showed throughput degradation, which was mainly caused by vignetting as a result of misalignment. The flat-fielding accuracy was degraded by the vignetting, with the variation depending on the direction of the telescope." @default.
• W3089431115 created "2020-10-08" @default.
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• W3089431115 date "2020-10-02" @default.
• W3089431115 modified "2023-09-23" @default.
• W3089431115 title "Integral field unit for the existing imaging and spectroscopy instrument, FOCAS" @default.
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• W3089431115 doi "https://doi.org/10.1093/pasj/psaa092" @default.
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