Tidally induced bar-like galaxies in simulated clusters

Abstract

One of the scenarios for bar formation in galaxies involves their interaction with a more massive companion. The stellar component is then transformed from a disk into a bar-like prolate spheroid. I investigated a subsample of 77 bar-like galaxies tidally induced in the cluster environment, selected among the previously studied sample of bar-like galaxies from the IllustrisTNG simulations. I present six clear, convincing examples of bar-like galaxies formed after an interaction with a progenitor of a massive brightest cluster galaxy (BCG) and describe the properties of their bars. For the whole sample, the time of bar formation is strongly correlated with and typically slightly greater than the time of the pericenter passage. All galaxies are strongly stripped of dark matter and gas, and their rotation is similarly diminished. A larger pericenter distance typically requires a higher host mass in order to transform the galaxy, but the interactions show no preference for prograde configurations. The final strength of the bars does not correlate with the amount of tidal stripping experienced because of the variety of initial properties of the progenitors and the subsequent evolution over the next pericenter passages. In spite of difficulties in the interpretation of some cases involving mergers and multiple interactions, the results confirm in the cosmological context the reality of tidal bar formation in cluster environments previously studied using controlled simulations.

11 pages, 8 figures, accepted for publication in A&A

References in corpus (29)

• First results from the IllustrisTNG simulations: matter and galaxy clustering
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• What determines the strength and the slowdown rate of bars ?
• Morphology, photometry and kinematics of N-body bars. I Three models with different halo central concentrations
• Bar formation and evolution in disc galaxies with gas and a triaxial halo: Morphology, bar strength and halo properties
• A Classical Morphological Analysis of Galaxies in the Spitzer Survey of Stellar Structure in Galaxies (S4G)
• Ram Pressure Stripping in High-Density Environments
• Morphological evolution of disk galaxies in clusters
• Galactic Angular Momentum in the Illustris Simulation: Feedback and the Hubble Sequence
• The EFIGI catalogue of 4458 nearby galaxies with detailed morphology
• The Atlas3D project - XXIV. The intrinsic shape distribution of early-type galaxies
• The regeneration of stellar bars by tidal interactions. Numerical simulations of fly-by encounters
• Tidally induced bars in Illustris galaxies
• Adventures of a tidally induced bar
• Tidally induced bars of galaxies in clusters
• A Milky Way-like barred spiral galaxy at a redshift of 3
• Formation of tidally induced bars in galactic flybys: prograde versus retrograde encounters
• Barred Galaxies in the IllustrisTNG Simulation
• Tidal evolution of galaxies in the most massive cluster of IllustrisTNG-100
• Barred galaxies in the Illustris-1 and TNG100 simulations
• The resonant nature of tidal stirring of disky dwarf galaxies orbiting the Milky Way
• The effect of warm gas on the buckling instability in galactic bars
• Bar-like galaxies in IllustrisTNG
• Prospects for Recovering Galaxy Intrinsic Shapes from Projected Quantities
• Origin of Non-axisymmetric Features of Virgo Cluster Early-type Dwarf Galaxies. I. Bar Formation and Recurrent Buckling
• Preprocessing in small groups: Three simulated galaxies interacting prior to cluster infall
• The oldest tidally induced bar-like galaxy in the IllustrisTNG cluster