S. Dusini (INFN), C. Sirignano, L. Stanco (INFN), S. Ventura (INFN)


Fulvio Laudisio

Research Activity

This activity is in collaboration with the Euclid European consortium that has a key role in the construction, data taking and data analysis of the ESA approved Euclid space mission. The Group involved in the project is composed by researchers from Padova University (Physics and Astronomy and Information Engineering Departments), INFN and INAF Padova.
The Euclid mission is designed to investigate the nature of dark energy and dark matter and it is optimized for two independent primary cosmological probes: Weak gravitational Lensing (WL) and Baryonic Acoustic Oscillations (BAO). WL is a technique to map dark matter and measure dark energy by quantifying the apparent distortions of galaxy images. The lensing signal is derived from the measurement of shape and distance of galaxies. BAO are wiggle patterns imprinted in the clustering of galaxies that provide a standard ruler to measure the expansion of the Universe.

The launch of the Euclid satellite is expected in 2020 and the data taking will last at least 6 years. The payload consists of a 1.2 m aperture Korsch telescope that drives the light to two instruments via a dichroic filter: the visual imager (VIS) and the near-infrared spectrometer and photometer (NISP). Both instruments share a large common field of view (~0.54 srad). VIS provides high quality images to carry out the weak lensing galaxy shear measurements. NISP performs imaging photometry to provide NearInfraRed (NIR) photometric measurements for photometric redshifts, and slitless spectroscopy. The VIS can measure the shapes of galaxies with a resolution better than 0.2 arcsec. The NISP works in photometric mode with three NIR bands and in spectroscopic mode looking at H-alpha line.
VIS and NISP will be hosted on a cold-module (<140K) while the electronics boards devoted to the data processing (DPU) and to the slow control (ICU) will stay on a warm-module (>240K), they are referred as NISP warm electronics (NISP-WE).

The INFN Padova group is responsible of all the activities related to the hardware assembly, software integration and validation of the NISP-WE.