演講資訊

摘要：

Galaxy angular momentum reflects both the memory of the early universe and the influence of late-time cosmic environments. Multiple processes reshape spin orientations over cosmic time, leading to characteristic alignments between galaxy spins and the surrounding cosmic structures. In this talk, I will present a sequence of our recent studies using cosmological hydrodynamical simulations to examine galaxy spin properties, mainly focusing on the spin alignment phenomenon. I will trace how these alignments are generated through various channels across different scales and epochs: galaxy-galaxy interactions, the compressive effect of local tidal fields, and primordial tidal torquing. I will then introduce a newly defined parameter, the primordial spin factor (τ). It quantifies the initial misalignment between the inertia and tidal tensors, serving as a key factor not only in shaping spin alignments but also in affecting diverse present-day galaxy properties. Finally, I will briefly highlight our ongoing efforts to connect simulations and observations using MaNGA integral-field spectroscopy data and to test the detectability of the predicted spin alignment signals.