Seminarium "Teoria cząstek elementarnych i kosmologia"

I will talk about the interactions between galaxies and how they influence their dynamics and morphology. The presentation will focus on recent results of simulations following an interaction of two similar disky galaxies on unbound orbits. It turns out that the result of the interaction can be very different depending on the relative orientation of the galaxy's internal spin and its orbital angular momentum. In the case of aligned spins and a sufficiently strong interaction, it can result in the formation of a tidally induced bar. The scenario will be placed in the cosmological context using the Illustris simulations. Then, I will discuss in detail the properties of such bars and the so-called buckling instability that occurs in them, when the bar becomes distorted out of the disk plane. I will present different measures of asymmetry in the edge-on view as well as kinematic signatures of buckling. I will demonstrate that tidally induced bars offer a unique possibility to obtain insight into the nature of buckling instability.