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High-redshift galaxies are the source of the ionizing radiation responsible for driving the Epoch of Reionization (EoR). Our knowledge of high redshift (z>6) galaxy formation is constantly improving and will take yet another important step forward with the imminent launch of JWST. In tandem to this, the upper limits on the 21cm power spectrum from neutral hydrogen during the EoR are continually improving, with a firm measurement being a certainty in coming years. In order to maximise what we can learn from these two complimentary observational datasets, we need to be able to model them together, self-consistently. However, this is a difficult task. In this talk I will give a brief overview of why this is, before moving on to discuss semi-analytic models as a useful and powerful compliment to other relevant simulation methods. I will then present some of the recent and ongoing work being carried out at the University of Melbourne ASTRO 3D node using the Meraxes semi-analytic model to explore high redshift galaxy formation and the EoR. In particular, I will focus on the effects of dust modelling assumptions on inferred galaxy formation parameters, constraining the escape fraction of ionising photons, and extending the mass resolution of simulations to resolve the faintest ionising sources. To finish off, I will switch gears and discuss Science and Technology Australia’s STEM Ambassador program and the importance of scientists actively advocating for evidence based policy and interacting with politicians. |
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