Abstract :
Investigating the star formation rate density (SFRD) of galaxies across cosmic time stands as a fundamental pursuit in modern astrophysics. While galaxy surveys have effectively traced the SFR up to a redshift of approximately z∼ 11, their limitation lies in the inability to capture complete information, particularly due to the presence of numerous faint and undetectable galaxies, especially at high redshifts. To complement traditional surveys, the intensity mapping technique (2D or 3D) has emerged as a valuable approach. CONCERTO, a pioneering instrument operating at 120-310 GHz, has measured the 3D fluctuations of the [CII] line from sources at z>5. By exploiting the tight correlation between the [CII] line and SFR in galaxies, the goal was to trace high-z dusty star formation. Through the development of a realistic simulation, my aim has been to assess the potential for extracting physical information from such intensity mapping experiments. Additionally, I will focus on how the 2D (CIB) and 3D (extragalactic CO) intensity mapping can bring us closer to detecting the elusive kinematic Sunyaev–Zeldovich signal, which holds crucial information about the epoch of reionization.
