Cold stream stability during minor mergers

Liang Wang, Weishan Zhu, Long Long Feng, Andrea Maccio, Jiang Chang, Xi Kang

Research output: Contribution to journalArticle

Abstract

We use high-resolution Eulerian simulations to study the stability of cold gas flows in a galaxy size dark matter halo (1012M⊙) 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 centre of the halo for 0.5 Gyr. However, if the supply of cold gas at large distan ces 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.

Original languageEnglish (US)
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume439
Issue number1
DOIs
StatePublished - Mar 1 2014

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merger
cold gas
halos
Kelvin-Helmholtz instability
thermal convection
free convection
gas flow
dark matter
gas
simulation
cold
galaxies
perturbation
accretion
high resolution

Keywords

  • Galaxies: formation
  • Galaxies: interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Cold stream stability during minor mergers. / Wang, Liang; Zhu, Weishan; Feng, Long Long; Maccio, Andrea; Chang, Jiang; Kang, Xi.

In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 439, No. 1, 01.03.2014.

Research output: Contribution to journalArticle

Wang, Liang ; Zhu, Weishan ; Feng, Long Long ; Maccio, Andrea ; Chang, Jiang ; Kang, Xi. / Cold stream stability during minor mergers. In: Monthly Notices of the Royal Astronomical Society: Letters. 2014 ; Vol. 439, No. 1.
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