Affiliation: European Space Agency (ESA)

Contribution: Poster

Title: The Euclid survey

Abstract: Euclid, launched on July 1st, 2023, is a medium-class mission in the Cosmic Vision 2015–2025 programme of the European Space Agency (ESA). Euclid provides high-resolution optical imaging, as well as near-infrared imaging and spectroscopy, over about 14000 square degrees of the Extragalactic sky. In addition to accurate weak lensing and galaxy clustering measurements that probe structure formation over half of the age of the Universe, its primary probes for cosmology, these data enable a wide range of additional science. Euclid instruments consist of a wide-band visible imager (VIS) and a near-infrared spectrophotometer (NISP). To achieve its primary cosmology objectives, Euclid aims to observe a sample of 1.5 billion galaxies for the weak lensing, and measure 35 million redshifts for the analysis of the spectroscopic clustering signal. To do so, it needs to cover about 14000 sq. deg. of Extragalactic sky with low zodiacal background and low Galactic extinction, for which it requires a period of about six years. The Wide Survey is scheduled to observe as much of the region of interest as possible during 6 years of the mission. On top of this Wide Survey (EWS), the mission also needs three Deep Fields (EDS): the need to calibrate and monitor the telescope, cameras and electronics requires repeated visits of specific fields that will accumulate substantial depth over time. In this poster, we briefly describe the different parts of the Euclid survey and the methods used to schedule them and re-plan them as part of the ever-evolving operational situation, the challenges encountered after launch from the additional stray-light situation, and the current state of the executed survey. We also discuss future plans for the main survey and the additional observing opportunities provided by the periods of unallocated time where the main cosmology probes run out of good areas to observe.

This contribution can be found in the Poster Hall.