Tidally induced bars in Illustris galaxies
Nicolas Peschken, Ewa L. {\L}okas

TL;DR
This study uses the Illustris simulation to analyze the formation and evolution of tidally induced bars in high-mass disc galaxies, revealing that external interactions significantly influence bar strength and prevalence.
Contribution
It provides the first detailed analysis of tidally induced bars in a cosmological simulation, highlighting the role of flybys and external perturbers in bar formation and evolution.
Findings
Bar fraction at z=0 is 21%, lower than observed in the local Universe.
Most bars are triggered by external interactions rather than secular evolution.
Tidally induced bars tend to be stronger and are influenced by the orbit and strength of flybys.
Abstract
We study barred galaxies selected from the Illustris cosmological simulation, focusing on tidally induced bars formed from flyby interactions. To guarantee high enough resolution we focus on high mass disc galaxies (). We find that the fraction of barred galaxies among those (21% at redshift ) is lower in Illustris than observed in the local Universe, and the fraction grows slightly with redshift. The bar fraction also increases with the stellar mass and decreases with the amount of gas in the disc. Only very few bars at redshift are formed in secular evolution ( 7%) and most of them are triggered by external perturbers in mergers or flybys. Many of these bars disappear over time, mostly during secular evolution, which leads to a lower fraction of bars at redshift . We then focus on the effect of flyby interactions on the disc and…
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