Modeling Evolution of Galactic Bars at Cosmic Dawn

Abstract

We study evolution of galactic bars using suite of very high-resolution zoom-in cosmological simulations of galaxies at z ~ 9-2. Our models were chosen to lie within similar mass DM halos, log(Mvir/Mo) ~ 11.65 +- 0.05, at z=6, 4, and 2, in high and low overdensity environments. We apply two galactic wind feedback mechanisms for each model. All galaxies develop sub-kpc stellar bars differing in their properties. We find that (1) The high-z bars form in response to various perturbations: mergers, close flybys, cold accretion inflows along the cosmological filaments, etc.; (2) These bars account for large-mass fraction of galaxies; (3) Bars display large corotation-to-bar-size ratios, and are weaker compared to their low-redshift counterparts, by measuring their Fourier amplitudes, and are very gas-rich; (4) Their pattern speed does not exhibit monotonic decline with time due to braking against DM, as at low z; (5) Bar properties, including their stellar population (SFRs and metal enrichment) depend sensitively on prevailing feedback; (6) Finally, we find that bars can weaken substantially during cosmological evolution, becoming weak oval distortions -- hence bars are destroyed and reformed multiple times unlike their low-z counterparts. In all cases, bars in our simulations have been triggered by interactions. In summary, stellar bars appear to be not only contemporary phenomenon, but based on increased frequency of mergers, flybys and the strength of cold accretion flows at high z, we expect them to be ubiquitous at redshifts > 2 -- the epoch of rapid galaxy growth and larger stellar dispersion velocities.

Astrophysical Journal (in press), 24 pages, 16 figures

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Cited by in corpus (15)

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• The rapid onset of stellar bars in the baryon-dominated centers of disk galaxies
• Simulated Bars May Be Shorter But Are Not Slower Than Observed: TNG50 vs. MaNGA
• Simulations of star forming main sequence galaxies in Milgromian gravity
• The Origin of Buckling Instability in Galactic Bars: Searching for the Scapegoat
• Stellar Bars in Spinning Halos: Delayed Buckling and Absence of Slowdown
• Galaxy formation physics behind bar formation: A view from cosmological hydrodynamical simulations
• Unraveling Joint Evolution of Bars, Star Formation, and Active Galactic Nuclei of Disk Galaxies
• The redshift evolution of galactic bar pattern speed in TNG50
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• Multiple-scale gas infall through gravity torques on Milky Way twins
• Formation of Substructure in Luminous Submillimeter Galaxies (FOSSILS): Evidence of Multiple Pathways to Trigger Starbursts in Luminous Submillimeter Galaxies
• The oldest tidally induced bar-like galaxy in the IllustrisTNG cluster
• Discovery of a Barred-Spiral Galaxy at $z_{spec}$ = 3.16 II. The Star Formation History
• A nuclear disc at Cosmic Noon: evidence of early bar-driven galaxy evolution