Abstract
Whether the formation of bars is triggered by interactions or by internal processes has been discussed for many decades. In this work, we study differences between both mechanisms by means of numerical simulations. We relate our analysis to fly-by interactions in different mass groups or clusters according to the velocity of the encounters. We find that once the bar is created, the interaction does not much affect its evolution. We also find that bars can be triggered purely by a slow interaction. Those bars affected or triggered by interaction stay for a longer time in the slow regime, i.e., the corotation radius is more than 1.4 times the bar radius.
Highlights
In this work we present a detailed study on how the environment affects the evolution of disk galaxies
The slow interactions, which we identify with encounters in groups of low mass, have a stronger effect on the galaxy
Focussing on the strong bar created purely by the slow interaction, we find that it is slower in dynamical terms (R > 1.4) than those created in isolation as already seen in [12,13]
Summary
In this work we present a detailed study on how the environment affects the evolution of disk galaxies Certain internal processes such as bar formation can be driven by interactions. Bars are ellipsoidal-like features presented in a large fraction of discs in galaxies They have strong influence on the dynamics of discs of galaxies. There are examples in the Universe of isolated galaxy pairs showing prominent bar features [5] These cases point towards the influence of the environment on the bar formation and is confirmed in larger galaxy samples. [7] showed that the effect of the environment on the bar formation depends on the mass of the galaxy They proposed that interactions trigger bar formation in massive galaxies that are stable enough to keep their cold disks even in galaxy clusters. We will focus on the three observational parameters which mainly characterize bars in galaxies: the bar length, the bar strength and the pattern speed
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