Modelling galaxy formation in a cosmological context

DIPC Seminars

Camila Correa, Leiden University, Netherlands
Donostia International Physics Center
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Modelling galaxy formation in a cosmological context How galaxies form and evolve through cosmic time is one of the key questions of modern astrophysics. Cosmological time- and length-scales are so large that the evolution of individual galaxies cannot be directly observed. Only through numerical simulations we can follow the emergence of cosmic structures within the current cosmological paradigm. In this talk I will introduce cosmological simulations of galaxy formation, I will discuss how the simulated galaxies’ mass growth depends on the rate of growth of their parent dark matter haloes. Large-scale surveys have shown that most galaxies in the local Universe can be divided into two distinct populations, that differ in colour, star formation and morphology. I will show how the simulations reproduce these populations and comment the relation between galaxies changing colour and morphology. Cosmological simulations, however, are far from perfect. Feedback processes are not numerically resolved, and we have to rely on analytic prescriptions for these phenomena, the so-called ‘sub-grid physics’ modelling. The challenging task now is to improve the sub-grid modelling and at the same time increase the resolution of the simulations to unprecedented values. In the last slides I will comment on the latests updates done in this front, as well as on future research prospects. Host: Raul Angulo