VIRMOS: visible and infrared multiobject spectrographs for the VLT

Details VIRMOS: visible and infrared multiobject spectrographs for the VLT VIRMOS: visible and infrared multiobject spectrographs for the VLT

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3355....8l&link_type=abstract

Proc. SPIE Vol. 3355, p. 8-19, Optical Astronomical Instrumentation, Sandro D'Odorico; Ed.

Astronomy and Astrophysics

Astronomy

15

Scientific paper

We present the current design of the VIsible Multi-Object Spectrograph (VIMOS) and the Near InfraRed Multi-Object Spectrograph (NIRMOS) for the European Southern Observatory Very Large Telescope. The basic scientific requirement is to conduct very deep redshift surveys of large quantities of objects, in a minimum number of nights. The technical specifications are to allow for a large multiplex gain over a wide field, and a high efficiency of the optical train, over the 0.37 to 1.8 micrometer domain. The baseline technical concept is built around 4 channels, covering 4 X 7 X 8 arcmin(superscript 2) for VIMOS and 4 X 7 X 7 arcmin(superscript 2) for NIRMOS. Each channel is an imaging spectrograph with a large field adaptation lens, a collimator, grisms or filters, and a F/1.8 camera, coupled to a 2048 X 4096 pixels CCD for VIMOS, and a 2048(superscript 2) HgCdTe Rockwell array for NIRMOS. The unique multiplex gain allows to obtain spectra of up to 840 object simultaneously with VIMOS, and up to 170 with NIRMOS (10 arcsec slits). An integral field spectroscopy mode with more than 6400 fibers coupled to micro-lenses will be available for VIMOS, covering a 1 X 1 arcmin(superscript 2) field. The VLT-VIRMOS survey of more than 150,000 galaxies is planned down to magnitudes I(subscript AB) equals 24, coupled to an ultra deep probe to I(subscript AB) equals 26.

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