Cold stream stability during minor mergers
arXiv:1401.1812 · doi:10.1093/mnrasl/slu005
Abstract
We use high-resolution Eulerian simulations to study the stability of cold gas flows in a galaxy size dark matter halo (10^12 Msun) at redshift z=2. Our simulations show that a cold stream penetrating a hot gaseous halo is stable against thermal convection and Kelvin-Helmholtz instability. We then investigate the effect of a satellite orbiting the main halo in the plane of the stream. The satellite is able to perturb the stream and to inhibit cold gas accretion towards the center of the halo for 0.5 Gyr. However, if the supply of cold gas at large distances is kept constant, the cold stream is able to re-establish itself after 0.3 Gyr. We conclude that cold streams are very stable against a large variety of internal and external perturbations.
5 pages, 3 figures, accepted for publication in MNRAS Letters
References in corpus (10)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Cold streams in early massive hot haloes as the main mode of galaxy formation
- Concentration, Spin and Shape of Dark Matter Haloes as a Function of the Cosmological Model: WMAP1, WMAP3 and WMAP5 results
- A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
- Moving mesh cosmology: tracing cosmological gas accretion
- Bimodal gas accretion in the Horizon-MareNostrum galaxy formation simulation
- Seeding the formation of cold gaseous clouds in Milky Way size halos
- Dissecting the properties of optically-thick hydrogen at the peak of cosmic star formation history
- Metal-Poor, Cool Gas in the Circumgalactic Medium of a z = 2.4 Star-Forming Galaxy: Direct Evidence for Cold Accretion?
- Turbulence in the Inter-galactic Medium: Solenoidal and Dilatational Motions, and the Impact of Numerical Viscosity
Cited by in corpus (5)
- Co-orbiting satellite galaxy structures are still in conflict with the distribution of primordial dwarf galaxies
- Hiding in plain sight: An abundance of compact massive spheroids in the local Universe
- Instability of Supersonic Cold Streams Feeding Galaxies I: Linear Kelvin-Helmholtz Instability with Body Modes
- Entrainment of Hot Gas into Cold Streams: The Origin of Excessive Star-formation Rates at Cosmic Noon
- Evolution of cold streams in hot gaseous halos