Cake Talk by Lucie Rowland
JWST's discovery of numerous bright galaxies at Cosmic Dawn, including potentially "Universe-breaking" massive systems, is transforming our understanding of early galaxy formation and the speed at which galaxies assembled their mass in the early Universe. To investigate this further, I will present the latest results from the REBELS team, leveraging observations from both ALMA and JWST of a sample of massive galaxies at z~6-8. The NIRSpec IFU observations at 0.6-5.3 um of 12 of these galaxies provides spatially resolved information of their stellar content, star formation, metallicity, and ionisation properties, and reveals surprisingly metal-rich systems at high redshift. With this dataset, we are able to extend the mass-metallicity relation to higher mass systems, and with robust [CII] and dust continuum detections of the same galaxies with ALMA, we are also able to connect spatially resolved metallicity information with their dust emission and cold gas content. Additionally, I will discuss the discovery of a dynamically cold disc at z=7.31, challenging current cosmological models of galaxy kinematics. This powerful synergy of JWST and ALMA data provides a detailed panchromatic study of the assembly of massive galaxies in the Epoch of Reionisation, and offers new insights into early galaxy evolution.