Very wide integral field unit of VIRMOS for the VLT: design and performances

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Abstract
This paper presents the VLT-VIMOS Integral Field Spectroscopy Unit. This unit allows to observe a very large 54 inch by 54 inch field on one edge of the VIMOS instrument multi-object field. This unit contains 6400 sets of (mu) lenses-fibers-(mu) lenses, producing the equivalent of a 72 arcminute by 0.67 arcsec slit projected on the sky. Two spatial resolution are offered, coupled with the low and high spectral resolution of VIMOS. The design philosophy, technological choices and the first test result of the assembled unit are presented.

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