
Sofia Feltzing
Professor

4MOST - 4-metre multi-object spectroscopic telescope
Författare
Summary, in English
The 4MOST consortium is currently halfway through a Conceptual Design study for ESO with the aim to develop a wide-field (>3 square degree, goal >5 square degree), high-multiplex (>1500 fibres, goal 3000 fibres) spectroscopic survey facility for an ESO 4m-class telescope (VISTA). 4MOST will run permanently on the telescope to perform a 5 year public survey yielding more than 20 million spectra at resolution R∼5000 (λ=390-1000 nm) and more than 2 million spectra at R∼20,000 (395-456.5 nm & 587-673 nm). The 4MOST design is especially intended to complement three key all-sky, space-based observatories of prime European interest: Gaia, eROSITA and Euclid. Initial design and performance estimates for the wide-field corrector concepts are presented. Two fibre positioner concepts are being considered for 4MOST. The first one is a Phi-Theta system similar to ones used on existing and planned facilities. The second one is a new R-Theta concept with large patrol area. Both positioner concepts effectively address the issues of fibre focus and pupil pointing. The 4MOST spectrographs are fixed configuration two-arm spectrographs, with dedicated spectrographs for the high- and low-resolution fibres. A full facility simulator is being developed to guide trade-off decisions regarding the optimal field-of-view, number of fibres needed, and the relative fraction of high-to-low resolution fibres. The simulator takes mock catalogues with template spectra from Design Reference Surveys as starting point, calculates the output spectra based on a throughput simulator, assigns targets to fibres based on the capabilities of the fibre positioner designs, and calculates the required survey time by tiling the fields on the sky. The 4MOST consortium aims to deliver the full 4MOST facility by the end of 2018 and start delivering high-level data products for both consortium and ESO community targets a year later with yearly increments.
Avdelning/ar
- Geologiska institutionen
- eSSENCE: The e-Science Collaboration
- Lund Observatory - Has been reorganised
Publiceringsår
2012
Språk
Engelska
Publikation/Tidskrift/Serie
Proceedings of SPIE - The International Society for Optical Engineering
Volym
8446
Dokumenttyp
Konferensbidrag
Förlag
SPIE
Ämne
- Astronomy, Astrophysics and Cosmology
Nyckelord
- eROSITA
- Euclid
- Facility simulator
- Fibre postioner
- Gaia
- NTT telescope
- VISTA telescope
- Wide field corrector
- Wide-field multi-object spectrograph facility
Conference name
Ground-Based and Airborne Instrumentation for Astronomy IV
Conference date
2012-07-01 - 2012-07-06
Conference place
Amsterdam, Netherlands
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 0277-786X
- ISBN: 9780819491473