The Representative Cluster Evolution SZ Survey (ReCESS) is a project that studies the intracluster medium (ICM) in galaxy clusters at high redshifts (z > 1.25) using the Sunyaev-Zel'dovich (SZ) effect at arcsecond scale resolution. By examining these high-z clusters,  initially selected throuh ACT observations, I aim to study their dynamical states, morphology, and evolutionary processes -- as I explain in this talk.

Recently, we secured over 80 hours of observing time on the Green Bank Telescope (GBT) to systematically follow up on all z > 1.25 clusters detected by ACT. These observations will allow us to study clusters during their most active growth periods and address systematics in cluster cosmology measurements at these uncharted epochs.

Papers:

1. XLSSC 122, caught in the ACT of growing up: Spatially resolved SZ observations of a z=1.98 galaxy cluster (J. van Marrewijk et al. Sub.)

2. Galaxy clusters at z~1 imaged by ALMA with the Sunyaev-Zel'dovich effect (T. Kitayama et al. 2023)

Directly comparing simulations with observations has always been challenging, particularly for sub-millimeter observations. Astronomers often require telescopes larger than 50 meters or must rely on interferometry to resolve their objects of interest. This complexity, combined with atmospheric noise, corrupts data and limits our understanding of the Universe. To address these issues, we developed a novel simulator for forecasting sub-millimeter observations. This tool helps bridge the gap between theory and observation, forecasts future observations, and links telescope design directly to scientific feasibility. For a detailed description of the tool and tutorials on how to use it, please refer to my paper and visit https://thomaswmorris.com/maria/.

Papers:

1. maria: A novel simulator for forecasting (sub-)mm observations (J. van Marrewijk et al. Sub.)

I am intrigued by what JWST is bringing us in terms of detections and the characterization of galaxies around the epoch of reionization. However, JWST is not the only telescope that can detect light from only 100 Myr after the Big Bang. ALMA has access to the FIR lines, crucial for deriving the properties that drive the formation of the earliest galaxies.

Papers:

1. ALMA as z>10 line finder (J. van Marrewijk, M. Kaasinen et al. in Prep.)

2. To see or Not to see a z~13 galaxy? That is the Question (M. Kaasinen, J. van Marrewijk, G. Popping et al. 2023)

My work is continued in a series of papers that will characterize how dense gases are manifested in multiple starburst galaxies around the cosmic noon. This will help us understand what fuels star formation in these extreme galaxies.

Papers:

1. PRUSSIC II -- ALMA imaging of dense-gas tracers in SDP.81: Evidence for low mechanical heating and a sub-solar metallicity in a z=3.04 dusty galaxy (M. Rybak, J. van Marrewijk et al. 2023)

2. Prussic I -- a JVLA survey of HCN/HCO+/HNC(1-0) emission in z~3 dusty galaxies: Low dense-gas fractions in high-redshift star-forming galaxies. (M. Rybak et al. 2022)

Cool cores are galaxy clusters for which the X-ray emission strongly peaks in the center. This would suggest that the core of this type of cluster of galaxies cools rapidly through radiative cooling and hence their name. However, characterizing the inner regions is not as straightforward as one might think.

Through multi-wavelength observations (radio, molecular lines, SZ-effect, optical, and X-ray), we try to get a complete view of all the mechanics at play in the inner regions of cool cores. This will give insights into the coupling between processes such as cooling flows, sloshing, and AGN feedback from the smallest to the largest scales. Check, for instance, this talk I gave about RXC-J2014.8, the strongest cool-core in REXCESS.

Papers:

1. The strongest cool core in REXCESS: Missing X-ray cavities in RXC J2014.8-2430 (T. Mroczkowski, M. Donahae, J. van Marrewijk et al. 2022)