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Proceedings Paper

VIMOS and NIRMOS multi-object spectrographs for the ESO VLT
Author(s): Oliver LeFevre; Michel Saisse; Dario Mancini; Gianpaolo Vettolani; Dario Maccagni; Jean Pierre Picat; Yannick Mellier; Alain Mazure; Jean Gabriel Cuby; Bernard Delabre; Bianca Garilli; L. Hill; Eric Prieto; Clothaire Voet; Luc Arnold; Sylvie Brau-Nogue; Enrico Cascone; Paolo Conconi; Gert Finger; Gotthard Huster; Andree Laloge; Christian Lucuix; E. Mattaini; Pietro Schipani; G. Waultier; Filippo Maria Zerbi; Gerardo Avila; James W. Beletic; Sandro D'Odorico; Alan F. M. Moorwood; Guy J. Monnet; Javier Reyes Moreno
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Paper Abstract

The VIRMOS consortium of French and Italian Institutes is manufacturing 2 wide field imaging multi-object spectrographs for the European Southern Observatory Very Large Telescope, with emphasis on the ability to carry over spectroscopic surveys of large numbers of sources. The Visible Multi-Object Spectrograph, VIMOS, is covering the 0.37 to 1 micron wavelength domain, with a full field of view of 4 by 7 by 8 arcmin2 in imaging and MOS mode. The Near IR Multi-Object Spectrograph, NIRMOS, is covering the 0.9 to 1.8 microns wavelength range, with afield of view 4 by 6 by 8 arcmin2 in MOS mode. The spectral resolution for both instrument scan reach up to R equals 5000 for a 0.5 arcsec wide slit. Multi-slit masks are produced by a dedicated Mask Manufacturing Machine cutting through thin Invar sheets and capable of producing 4 slit masks approximately 300 by 300 mm each with approximately slits 5.7 mm long in less than one hour. Integral field spectroscopy is made possible in VIMOS by switching in the beam specially build masks fed by 6400 fibers coming form a 54 by 54 arcsec2 integral field head with a 80 by 80 array of silica micro-lenses. NIRMOS has a similar IFS unit with a field of 30 by 30 arcmin2. These instruments are designed to offer very large multiplexing capabilities. In MOS mode, about 1000 objects can be observed simultaneously with VIMOS, with a S/N equals 10 obtained on galaxies with I equals 24 in one hour, and approximately 200 objects can be observed simultaneously with NIRMOS, with a S/N equals 10 obtained don galaxies with J equals 22, H equals 20.6 in 1h at Req equals 200. We present here the status of VIMOS, currently under final integration, with expected first light in the summer 2000, together with the final design of NIRMOS presented at the Final Design Review. The VLT-VIRMOS deep redshift survey of more with the final design of NIRMOS presented at the Final Design Review. The VLT-VIRMOS deep redshift survey of more than 150000 galaxies over the redshift range 0 < z < 5 will be undertaken based on 120 guaranteed nights awarded to the project.

Paper Details

Date Published: 16 August 2000
PDF: 12 pages
Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); doi: 10.1117/12.395513
Show Author Affiliations
Oliver LeFevre, Lab. d'Astronomie Spatiale (France)
Michel Saisse, Lab. d'Astronomie Spatiale (France)
Dario Mancini, Osservatorio Astronomico di Capodimonte (Italy)
Gianpaolo Vettolani, Istituto de Radio Astronomia (Italy)
Dario Maccagni, Istituto per Ricerche in Fisica Cosmica e Tecnologie Relative (Italy)
Jean Pierre Picat, Observatoire Midi-Pyrenees (France)
Yannick Mellier, Institut d'Astrophysique de Paris (France)
Alain Mazure, Lab. d'Astronomie Spatiale (France)
Jean Gabriel Cuby, European Southern Observatory (Chile)
Bernard Delabre, European Southern Observatory (Germany)
Bianca Garilli, Istituto per Ricerche in Fisica Cosmica (Italy)
L. Hill, Observatoire de Haute-Provence (France)
Eric Prieto, Lab. d'Astronomie Spatiale (France)
Clothaire Voet, Lab. d'Astronomie Spatiale (France)
Luc Arnold, Observatoire de Haute-Provence (France)
Sylvie Brau-Nogue, Observatoire Midi-Pyrenees (France)
Enrico Cascone, Osservatorio Astronomico di Capodimonte (Italy)
Paolo Conconi, Osservatorio Astronomico di Brera (Italy)
Gert Finger, European Southern Observatory (Germany)
Gotthard Huster, European Southern Observatory (Germany)
Andree Laloge, Lab. d'Astronomie Spatiale (France)
Christian Lucuix, Observatoire Midi-Pyrenees (France)
E. Mattaini, Istituto per Ricerche in Fisica Cosmica e Tecnologie Relative (Italy)
Pietro Schipani, Osservatorio Astronomico di Capodimonte (Italy)
G. Waultier, Lab. d'Astronomie Spatiale (France)
Filippo Maria Zerbi, Osservatorio Astronomico di Brera (Italy)
Gerardo Avila, European Southern Observatory (Germany)
James W. Beletic, European Southern Observatory (United States)
Sandro D'Odorico, European Southern Observatory (Germany)
Alan F. M. Moorwood, European Southern Observatory (Germany)
Guy J. Monnet, European Southern Observatory (Germany)
Javier Reyes Moreno, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 4008:
Optical and IR Telescope Instrumentation and Detectors
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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