The lifetime of galactic bars: central mass concentrations and gravity torques

  title={The lifetime of galactic bars: central mass concentrations and gravity torques},
  author={Fr{\'e}d{\'e}ric Bournaud and Françoise Combes and Beno{\^i}t Semelin},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
Bars in gas-rich spiral galaxies are short-lived. They drive gas inflows through their gravity torques, and at the same time self-regulate their strength. Their robustness has been subject of debate, as it was thought that only the resulting central mass concentrations (CMCs) were weakening bars, and only relatively rare massive CMCs were able to completely destroy them. Through numerical simulations including gas dynamics, we find that with the gas parameters of normal spiral galaxies, the CMC… Expand

Figures from this paper

Quantifying the Redistribution of Mass in Galactic Disks due to Bars
Abstract Numerical simulations have shown that strong gravitational torque by non-axisymmetric components induce evolutionary processes such as redistribution of mass and angular momentum in theExpand
The effect of warm gas on the buckling instability in galactic bars
By using $N$-body and hydro simulations, we study the formation and evolution of bars in galaxies with significant gas content focusing on the phenomenon of the buckling instability. The galaxies areExpand
Tidally Induced Bars in Gas-rich Dwarf Galaxies Orbiting the Milky Way
Bars in galaxies may form not only through instability, but also as a result of an interaction with another galaxy. In particular, they may appear in disky dwarf galaxies interacting with MilkyExpand
Gas Feedback on Stellar Bar Evolution
We have analyzed evolution of live disk-halo systems in the presence of various fractions of gas, fgas � 8% of the disk mass, for 5 Gyr. Specifically, we have addressed the issue of angular momentumExpand
Gaseous flows in galaxies
  • F. Combes
  • Physics
  • Proceedings of the International Astronomical Union
  • 2007
Abstract The gas component plays a major role in the dynamics of spiral galaxies, because of its dissipative character, and its ability to exchange angular momentum with stars in the disk. Due to itsExpand
Effects of Gas on Formation and Evolution of Stellar Bars and Nuclear Rings in Disk Galaxies
We run self-consistent simulations of Milky Way-sized, isolated disk galaxies to study formation and evolution of a stellar bar as well as a nuclear ring in the presence of gas. We consider two setsExpand
Evolution of spiral galaxies in modified gravity II. Gas dynamics
The stability of spiral galaxies is compared in modified Newtonian Dynamics (MOND) and Newtonian dynamics with dark matter. We extend our previous simulations that involved pure stellar discs withoutExpand
Mass Distribution and Bar Formation in Growing Disk Galaxy Models
We report idealized simulations that mimic the growth of galaxy disks embedded in responsive halos and bulges. The disks manifested an almost overwhelming tendency to form strong bars that we foundExpand
Bulge Growth Through Disc Instabilities in High-Redshift Galaxies
The role of disc instabilities, such as bars and spiral arms, and the associated resonances, in growing bulges in the inner regions of disc galaxies have long been studied in the low-redshift nearbyExpand


The Destruction of Bars by Central Mass Concentrations
More than two-thirds of disk galaxies are barred to some degree. Many today harbor massive concentrations of gas in their centers, and some are known to possess supermassive black holes (SMBHs) andExpand
Gas accretion on spiral galaxies: Bar formation and renewal
The eects of gas accretion on spiral disk dynamics and stability are studied through N-body simulations, including star formation and gas/stars mass exchange. The detailed processes of bar formation,Expand
If the interstellar medium (ISM) in a galaxy is driven into the nuclear region, it will change the evolution of the galaxy. Although it is generally assumed that bars are efficient at driving the ISMExpand
Gravitational torques in spiral galaxies: Gas accretion as a driving mechanism of galactic evolution
The distribution of gravitational torques and bar strengths in the local Universe is derived from a detailed study of 163 galaxies observed in the near-infrared. The results are compared withExpand
Gas‐driven evolution of stellar orbits in barred galaxies
We carry out a detailed orbit analysis of gravitational potentials selected at different times from an evolving self-consistent model galaxy consisting of a two-component disc (stars+gas) and a liveExpand
On the formation of disk galaxies and massive central objects
We propose that massive central objects form in the centers of the bars that must develop in young high surface density galactic disks. Large-scale dynamics shut off the growth of the central massExpand
Dissipation in barred galaxies: the growth of bulges and central mass concentrations
Basic dynamical mechanisms that produce an amplification of the accretion rate of gas clouds into the central regions of barred galaxies, and their subsequent effects on the evolution of barredExpand
Formation and evolution of galactic disks with a multiphase numerical model
The formation and evolution of galactic disks are complex phenomena, where gas and star dynamics are coupled through star formation and the related feedback. The physical processes are so numerousExpand
The regeneration of stellar bars by tidal interactions: numerical simulations of fly-by encounters
We study the regeneration of stellar bars triggered by a tidal interaction, using numerical simulations of either purely stellar or stellar+gas disc galaxies. We find that interactions which areExpand
The existence and shapes of dust lanes in galactic bars
I study the flow of gas in and around the bars or ovals of model barred galaxies and show that it is intimately linked to the properties of the periodic orbits. Simulations show that the density ofExpand