Dr. Georges Kordopatis Profile

Dr. Georges Kordopatis

at Observatoire de la Côte d’Azur

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Publications (2)

Proceedings Article | 29 August 2022 Presentation + Paper

4MOST: the 4-metre multi-object spectroscopic telescope project in the assembly, integration, and test phase

Roelof de Jong, Olga Bellido-Tirado, Joar Brynnel, Steffen Frey, Domenico Giannone, Diana Johl, Jakob Walcher, Roland Winkler, Matthias Steinmetz, Sofia Feltzing, Jonathan Loveday, Karin Lind, Aida Ezzati Amini, Christine Füßlein, Silke Kuba, Genoveva Micheva, Miklos Gäbler, Ulrike Lemke, Allar Saviauk, Vincenzo Mainieri, Jean-François Pirard, Mike Irwin, Jean-Paul Kneib, Jochen Liske, Andrea Merloni, Ivan Minchev, Johan Richard, Else Starkenburg, Mark Sullivan, Isobel Hook, Richard McMahon, Wolfgang Gaessler, Johan Pragt, Alban Remillieux, Florian Rothmaier, Scott Smedley, Ingo Stilz, Nicholas Walton, David Alexander, Ross Church, Scott Croom, Luke Davies, Caroline Heneka, Nikolay Kacharov, Jörg Knoche, Georges Kordopatis, Mirko Krumpe, Sarah Martell, Peder Norberg, Ingrid Pelisoli, Sanjib Sharma, Jesper Storm, Elmo Tempel, Clare Worley, Florance Laurent, Thomas Bensby, Maria Bergemann, Cristina Chiappini, Norbert Christlieb, Maria-Rosa Cioni, Johan Comparat, Simon Driver

Proceedings Volume 12184, 1218414 (2022) https://doi.org/10.1117/12.2628965

KEYWORDS: Calibration, Telescopes, Spectrographs, Stars, Control systems, Metrology, Cameras, Spectroscopy, Galactic astronomy, Galaxy evolution, Active galactic nuclei

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Proceedings Article | 9 July 2018 Presentation

4MOST: the 4-metre multi-object spectroscopic telescope project at final design review (Conference Presentation)

Roelof de Jong, Samuel Barden, Olga Bellido-Tirado, Joar Brynnel, Sofia Feltzing, Richard McMahon, Gabriella Baker, Patrick Caillier, Wolfgang Gaessler, Holger Mandel, Jean-François Pirard, Johan Pragt, Nicholas Walton, Thomas Bensby, Maria Bergemann, Norbert Christleib, Cristina Chiappini, Maria-Rosa Cioni, Simon Driver, Alexis Finoguenov, Amina Helmi, Mike Irwin, Jean-Paul Kneib, Jochen Liske, Andrea Merloni, Ivan Minchev, Bob Nichol, Johan Richard, Else Starkenburg, Thomas Boller, Mirko Krumpe, Sarah Martell, Elmo Tempel, Georges Kordopatis, Karin Lind, Scott Croom, Luke Davies, Morgan Fouesneau, Manda Banerji, Vincenzo Mainieri, Steffen Frey, Domenico Giannone, Roger Haynes, Diana Johl, Olivier Schnurr, Jakob Walcher, Roland Winkler

Proceedings Volume 10702, 107021D (2018) https://doi.org/10.1117/12.2312012

KEYWORDS: Space telescopes, Telescopes, Spectroscopy, Optical instrument design, Device simulation, Astronomical imaging, Observatories, Computer simulations, Optical fibers

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We present an overview and status update of the 4MOST project at the Final Design Review. 4MOST is a major new wide-field, high-multiplex spectroscopic survey facility under development for the VISTA telescope at the Paranal Observatory of ESO. Starting in 2022, 4MOST will deploy 2436 optical fibres in a 4.1 square degree field-of-view using a fibre positioner based on the tilting spine principle. The fibres will feed one high-resolution (R~20,000) and two low-resolution (R~5000) spectrographs that all have fixed configuration, 3-channel designs with identical 6k x 6k CCD detectors. Updated performance estimates will be presented based on components already manufactured and pre-production prototypes of critical subsystems. The 4MOST science goals are mostly driven by a number of large area, space-based observatories of prime European interest: Gaia and PLATO (Galactic Archeology and Stellar Physics), eROSITA (High-Energy Sky), and Euclid (Cosmology and Galaxy Evolution). Science cases based on these observatories, along with wide-area ground-based facilities such as LSST, VISTA and VST drive the ten Consortium Surveys covering a large fraction of the Southern sky, with bright time mostly devoted to the Milky Way disk and bulge areas and the Magellanic Clouds, and the dark/gray time largely devoted to extra-galactic targets. In addition there will be a significant fraction of the fibre-hours devoted to Community Surveys, making 4MOST a true general-purpose survey facility, capable of delivering spectra of samples of objects that are spread over a large fraction of the sky. The 4MOST Facility Simulator was created to show the feasibility of the innovative operations scheme of 4MOST with all surveys operating in parallel. The simulator uses the mock catalogues created by the science teams, simulates the spectral throughput and detection of the objects, assigns the fibres at each telescope pointing, creates pointing distributions across the sky and simulates a 5-year survey (including overhead, calibration and weather losses), and finally does data quality analyses and computes the science Figure-of-Merits to assess the quality of science produced. The simulations prove the full feasibility of running different surveys in parallel.

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