Speaker
Description
Bars are common structures in spiral galaxies, and until recently, their formation and evolution were primarily studied through numerical simulations of individual galaxies and theoretical models. Over the past decade, however, hydrodynamical cosmological simulations, which model a wide range of physical processes involved in galaxy evolution, have opened new avenues for investigating bar dynamics, producing populations of simulated bars. In my talk I will present our analysis of the TNG50 simulation from the IllustrisTNG suite, focusing on two key aspects of bar evolution.
One critical parameter in bar evolution is its pattern speed. Previous studies have shown that the pattern speed tends to decrease over time due to dynamical friction exerted by dark matter halos, although gas inflows can counter this slowdown by contributing to the angular momentum balance. I will discuss how these and other factors influence the evolution of bar pattern speed in TNG50.
Up to 1/3 of bars observed in the Local Universe appear to double-barred, i.e. host an inner bar within the bigger outer one. In the second part of my talk I will present our new scenario of the formation of double bars, that is demonstrated through the two examples of these objects found in TNG50.
