Pattern speed evolution of barred galaxies in TNG50
Marcin Semczuk, Walter Dehnen, Ralph Sch\"onrich, E. Athanassoula

TL;DR
This study investigates how galaxy properties influence the evolution of bar pattern speeds in realistic cosmological simulations, revealing mass-dependent behaviors and the impact of AGN feedback on bar dynamics.
Contribution
It provides the first detailed analysis of bar pattern speed evolution in the cosmological TNG50 simulation, incorporating complex physics like star formation and AGN feedback.
Findings
More massive galaxies host bars that slow down rapidly.
Lower mass galaxies retain their initial pattern speeds longer.
AGN feedback amplifies the mass dependence of bar slowdown.
Abstract
Galactic bars are found in the majority of disc galaxies. They rotate nearly rigidly with an angular frequency called pattern speed. Previous idealised simulations have shown that bar pattern speed decreases with time due to dynamical friction exerted by the dark matter halo, while cold gas can reduce or even reverse this trend. We want to understand how different galaxy properties affect the evolution of the bar pattern speed in more realistic situations, including ongoing star formation, mass infall, AGN feedback and galaxy interactions. We used the high-resolution run TNG50-1 of the magnetohydrodynamical cosmological simulations suite IllustrisTNG to trace the pattern speed of simulated bars and see how it depends on various galaxy properties. Simulated bars with initially high pattern speed and a subsequent rapid slowdown are more likely found in more massive galaxies. Lower mass…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena
