doi.eso.org

• Hammer, François [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Morris, Simon [Durham University, UK]
• Cuby, Jean-Gabriel [LAM, Université Aix-Marseille, CNRS, France]
• Kaper, Lex [University of Amsterdam, the Netherlands; NOVA, the Netherlands]
• Steinmetz, Matthias [Leibniz-Institut für Astrophysik Potsdam, Germany]
• Afonso, José [IACE, Universidade de Lisboa, Portugal]
• Barbuy, Beatriz [IAG, São Paulo, Brazil]
• Bergin, Edwin [University of Michigan, USA]
• Finogenov, Alexis [University of Helsinki, Finland]
• Gallego, Jesus [Universidad Complutense de Madrid, Spain]
• Kassin, Susan [Space Telescope Science Institute, Baltimore, USA]
• Miller, Chris [University of Michigan, USA]
• Östlin, Goran [Stockholm University, Sweden]
• Pentericci, Laura [INAF – Osservatorio Astronomico di Roma, Italy]
• Schaerer, Daniel [University of Geneva, Switzerland]
• Ziegler, Bodo [Vienna University, Austria]
• Chemla, Fanny [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Dalton, Gavin [STFC-RALSPACE & University of Oxford, UK]
• De Frondat, Fatima [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Evans, Chris [UK Astronomy Technology Centre, STFC, Edinburgh, UK]
• Le Mignant, David [LAM, Université Aix-Marseille, CNRS, France]
• Puech, Mathieu [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Rodrigues, Myriam [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Sanchez-Janssen, Ruben [UK Astronomy Technology Centre, STFC, Edinburgh, UK]
• Taburet, Sylvestre [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Tasca, Lidia [LAM, Université Aix-Marseille, CNRS, France]
• Yang, Yanbin [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Zanchetta, Sandrine [Paris Observatory, Paris Science et Lettres, CNRS, France]
• Dohlen, Kjetil [LAM, Université Aix-Marseille, CNRS, France]
• Dubbeldam, Marc [Durham University, UK]
• El Hadi, Kacem [LAM, Université Aix-Marseille, CNRS, France]
• Janssen, Annemieke [NOVA, the Netherlands]
• Kelz, Andreas [Leibniz-Institut für Astrophysik Potsdam, Germany]
• Larrieu, Marie [IRAP, Université de Toulouse, CNRS, France]
• Lewis, Ian [University of Oxford, UK]
• MacIntosh, Mike [UK Astronomy Technology Centre, STFC, Edinburgh, UK]
• Morris, Tim [Durham University, UK]
• Navarro, Ramon [NOVA, the Netherlands]
• Seifert, Walter [Landessternwarte Königstuhl, Universität Heidelberg, Germany Heidelberg, Germany]

The powerful combination of the cutting-edge multi-object spectrograph named MOSAIC with the world largest visible/near-infrared telescope, ESO’s Extremely Large Telescope (ELT), will allow us to probe deeper into the Universe than ever before. MOSAIC is an extremely efficient instrument for obtaining spectra of the numerous faint sources in the Universe, including the very first galaxies and sources of cosmic reionisation. MOSAIC has a high multiplex in the near-infrared (NIR) and in the visible, and also has multi-integral field units (Multi-IFUs) in the NIR. It is therefore perfectly suited to carrying out an inventory of dark matter (from rotation curves) and baryons in the cool–warm gas phases in galactic haloes at z = 3–4. MOSAIC will enable detailed maps of the intergalactic medium at z = 3, the evolutionary history of dwarf galaxies during a Hubble time, and the chemistry as directly measured from stars up to several Mpc. It will also measure faint features in cluster gravitational lenses or in streams surrounding nearby galactic haloes. The preliminary design of MOSAIC is expected to begin next year and its level of readiness is already high, given the instrumental studies already carried out by the team.