4-metre Multi-Object Spectroscopic Telescope

4MOST will be a fibre-fed spectroscopic facility on the VISTA telescope with a large field-of-view to survey a significant fraction of the southern sky in a few years. 4MOST will have a high multiplex being able to simultaneously obtain spectra for ~2400 objects.

4MOST is foreseen to cover in a 5-year survey most of the Southern sky 2-3 times resulting in more than 20 million spectra. The main scientific drivers for 4MOST are drawn from experiments benefiting from the wide survey area covered by this facility thanks to its multiplexing and field of view. These includes:

  • Gaia follow-up
  • eROSITA follow-up: clusters of galaxies and AGN
  • Weak Lensing surveys
  • Baryonic Acoustic Oscillations and Redshift Space Distorsion
  • LSST transients follow-up

EPFL LASTRO is a member of the international consortium responsible for this project and intends to spend valuable science time using 4MOST for specific surveys. 

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