Orateur
Description
In recent years there have been an increasing amount of studies on the overdensities of galaxies in the distant Universe, even beyond a redshift of z>4. However, how these so-called protoclusters evolve from a structure stretching several hundreds of Mpc to a bonafide galaxy cluster and how these distant clusters of galaxies differ from local ones are still open questions in modern astronomy. This is because there are only a handful of observational constraints of clusters at intermediate, z~2, redshifts.
Despite being named for their visible galaxy constituents, a galaxy cluster's main baryonic matter component is the thermalized, low-density plasma found between the galaxies, which is known as the intracluster medium (ICM). Therefore, observations of the ICM in distant clusters of galaxies are key to answering the above-mentioned questions. However, many sub-mm observations focus only on the cluster members.
In this talk, I will show you how to jointly model ALMA+ACA+ACT observations of the ICM observed through the Sunyaev-Zeldovich (SZ) effect via a bayesian forward-modeling technique implemented in the Fourier domain. With this routine, we detect and characterize the ICM of the most distant galaxy cluster found in current SZ-cluster catalogs, namely XLSSC 122. This case study will be the start of a high-resolution era for observations of the ICM in high-z systems as single-dish telescopes start finding more and more high-z galaxy clusters, which can be followed up and combined with ALMA Band 3 and future Band 1 and 2 observations.
