L’instrument 4MOST est un spectrographe grand-champ multi-fibres pour le télescope VISTA de l’Observatoire Européen Austral (ESO) dans le désert de Paranal au Chili.

CRAL has been involved since 2014 in the design, assembly and tests of the two Low Resolution Spectrographs. The project is now fully in the Preliminary Acceptance Phase, with the PAE foreseen early in 2024.

4MOST (4-metre Multi-Object Spectroscopic Telescope) is a major new wide-field high-multiplex spectroscopic survey facility currently being designed for the VISTA telescope of ESO, with a first light foreseen in 2024.

4MOST has a broad range of science goals ranging from galactic archaeology and stellar physics to the high-energy physics, galaxy evolution, and cosmology. 4MOST will deploy 2436 fibres in a 4.1 square degree field-of-view using a positioner based on the tilting spine principle. The fibres will feed one high-resolution (R 20,000) and two medium-resolution (R 5000) spectrographs with fixed 3-channel designs and identical 6K x 6K CCD detectors. 4MOST will have a unique operation concept, in which 5-year public surveys both from the 4MOST Consortium and the ESO community will be combined and observed in parallel during each exposure. The 4MOST Facility Simulator (4FS) was developed to demonstrate the feasibility of this observing concept, showing that we can expect to observe above 50 million objects in the entire survey period and will eventually be used to plan and conduct the actual survey.

CRAL is the French partner in the 4MOST Consortium. In Lyon, CRAL-INSU builds the two Low-Resolution Spectrographs and co-leads the Cosmology Redshift Survey and LMA-IN2P3 manufactures the 4MOST LRS and HRS dichroics.

The 4MOST team @ CRAL is composed of the following members :

• Alban REMILLIEUX, Local Project Manager (from February 2019)
• Patrick CAILLIER, Local Project Manager (until January 2019)
• Johan RICHARD, Local Responsible Scientist, Co-PI of the 4MOST Cosmology Survey
• Jens-Kristian KROGAGER, Scientist (from January 2022)
• Florence LAURENT, Optical designer
• Karen DISSEAU, Optical engineer (until July 2022)
• Alexandre JEANNEAU, Optical designer for spectrograph transmission measurement
• Jean-Emmanuel MIGNIAU, Mechanical designer
• Didier BOUDON, Mechanical designer and AIT mechanics
• Eric DAGUISÉ, FEM computing mechanical engineer
• Diane CHAPUIS, Mechanical designer (until July 2021)
• Arlette PÉCONTAL, Software engineer
• Aurélien JARNO, AIT electronics
• Rémi GIROUD, Support for Local Project Manager (from September 2022)
• Emmanuel PECONTAL, Scientist
• Laurence TRESSE, 4MOST Executive Board member (until January 2021)
• Matthew LEHNERT, 4MOST Executive Board member (from January 2021)

• BlueMUSE / ESO-VLT
• Sphere+ / ESO-VLT
• WST / ESO
• MSE / CFHT

L’instrument Multi Unit Spectroscopic Explorer (MUSE) est un instrument de deuxième génération du Very Large Telescope (VLT), installé en 2014 sur la plateforme Nasmyth de l’Unité de Télescope 4 (Yepun) de l’Observatoire Européen Austral (ESO) dans le désert du Paranal au Chili. Pour observer avec MUSE.

SNIFS est installé sur le University of Hawaii 2.2-meter telescope sur le Mauna Kea à Hawaii, États-Unis (Lantz et al., 2003, SPIE). Pour observer avec SNIFS.

Instrument visiteur sur le Télescope Canada-France-Hawaii sur le Mauna Kea à Hawaii, États-Unis puis sur le Télescope William Herschel à La Palma, Espagne. Pour observer avec OASIS.

1999 SAURON : Spectrographic Areal Unit for Research on Optical Nebulae (Instrument décommissionné )Spectrographe à intégral de champ, instrument visiteur qui fut installé sur le Télescope William Herschel à La Palma, Espagne (Bacon et al., 2001, MNRAS, 326, 23 « The SAURON Project. The panoramic integral-field spectrograph » et le site Web pour le projet scientifique associé). Sa structure est exposée temporairement au Musée des Confluences à Lyon du 16 juin 2017 au 2 septembre 2018 dans le cadre de l’exposition « Carnets de collections ».