Euclid Spectroscopic Image Simulations and Reconstruction

Parallel Talk presented at the XX International Workshop on Neutrino Telescopes - Venice 23-27 October 2023 Abstract: Euclid is a European Space Agency (ESA) mission, designed to investigate the nature of Dark Energy and Dark Matter. It will measure the positions, shapes, andcolors for billions of galaxies, and also redshift for a subset of tens of millions of those galaxies to map the matter distribution with unprecedented accuracy. Thesatellite launch took place in July 2023, and the data taking will last for six years covering one-third of the entire sky. To attain the desired level of precision in parameter estimation, meticulous management of systematic effects is required. These effects have both hardware and astrophysical origins: the former includes detector non-idealities and telescope response; the latter includes cosmic rays, background light, and signal contamination from different sources. In order to quantify the efficiency in the redshift reconstruction, we have developed the Spectroscopic Pipeline Runner and INput Generator (SPRING) which runs pixel-level simulations and performs the data processing through Euclid spectroscopic pipeline. SPRING is a runner of Euclid official codes suitable for quantifying systematics. It allows us to simulate both realistic images of the sky and non-astrophysical sources to properly evaluate instrumental effects.