Speaker
Description
Measuring the growth of cosmic structure is a powerful test of the standard cosmological model. The Euclid mission is delivering an unprecedentedly deep sample of Active Galactic Nuclei (AGN), providing a unique large-scale structure tracer reaching far into the high-redshift universe. Here, we explore the cosmological potential of cross-correlating Euclid AGNs with CMB lensing ($\kappa$) maps from Planck, ACT, and SO. Using a mock catalog of millions of unobscured AGNs up to $z=5$ (Bisigello et al., 2024), we model the $\kappa \times$ AGN signal to forecast constraints on the redshift evolution of structure growth ($\sigma_8(z)$), linear AGN bias, and primordial non-Gaussianity ($f_{NL}$). Building on this theoretical framework, we are actively adapting our pipelines to the newly acquired Euclid Q1 data. We will share early insights from these real observations, outlining our steps toward measuring the clustering properties of the first Euclid AGN sample.