Speaker
Description
In this talk I will demonstrate the remarkable synergy of multi-tracer observations in the early Universe, presenting the first small survey from the Epoch of Reionization of the distribution and morphology of dust obscured star formation, along with resolved cool gas ((CII)158) kinematics. The ten-galaxy sample includes an optically dark 'ALMA only' galaxy and is otherwise comprised of the most luminous cold gas and dust reservoirs from the REBELS ALMA large survey of UV-bright Lyman break galaxies, representing typical main sequence galaxies just above the z$\sim$7 stellar mass function knee, with SFR 50-100 M$_{\odot}$/yr. We identify gaseous outflows with high mass-loading fractions in several sources, consistent with that required in cosmological simulations to regulate star formation over cosmic time. We classify dynamical type as a probe of stellar mass build-up, finding 'dispersion-dominated' kinematics more common than anticipated. Our multi-tracer observations of these Epoch of Reionization galaxies allow us to compare ALMA dust maps with the results of resolved SED fitting to JWST/NIRCam and HST/WFC3 photometry from which we elucidate the variation of SFH and SFR, among other physical properties, across the extent of individual galaxies. This enables us to characterise star-forming clumps and estimate the contribution of these structures to the overall star formation rate across the galaxy. The analysis of this pioneering sample will contribute significantly to our understanding of the physical mechanisms driving and suppressing star formation in typical galaxies at the redshift frontier.
