Theory and Models of the Disc-Halo Connection
arXiv:0905.0431 · doi:10.1051/eas/1256055
Abstract
We review the evolution of the interstellar medium in disc galaxies, and show, both analytically and by numerical 3D hydrodynamic simulations, that the disc-halo connection is an essential ingredient in understanding the evolution of star forming galaxies. Depending on the star formation rate of the underlying gaseous disc, a galactic fountain is established. If the star formation rate is sufficiently high and/or cosmic rays are well coupled to the thermal plasma, a galactic wind will be formed and lead to a secular mass loss of the galaxy. Such a wind leaves a unique imprint on the soft X-ray spectra in edge-on galaxies, with delayed recombination being one of its distinctive features. We argue that synthetic spectra, obtained from self-consistent dynamical and thermal modelling of a galactic outflow, should be treated on an equal footing as observed spectra. We show that it is thus possible to successfully fit the spectrum of the starburst galaxy NGC 3079.
10 pages, 4 figures, Invited review for the proceedings of "The Role of Disk-Halo Interaction in Galaxy Evolution: Outflow vs Infall?" (Ed. M.A. de Avillez), in Espinho, Portugal, 18-22 August, 2008
References in corpus (13)
- Turbulent Structure of a Stratified Supernova-Driven Interstellar Medium
- The Milky Way's Kiloparsec Scale Wind: A Hybrid Cosmic-Ray and Thermally Driven Outflow
- Global Dynamical Evolution of the ISM in Star Forming Galaxies - I. High Resolution 3D HD and MHD Simulations: Effect of the Magnetic Field
- Disk-Halo Interaction - I. Three-Dimensional Evolution of the Galactic Disk
- Volume Filling Factors of the ISM Phases in Star Forming Galaxies - I. The Role of the Disk-Halo Interaction
- Direct simulations of a supernova-driven galactic dynamo
- The search for the origin of the Local Bubble redivivus
- Chandra Detection of a Hot Gaseous Corona Around the Edge-on Galaxy NGC 4631
- The origin of the young stellar population in the solar neighborhood - a link to the formation of the Local Bubble?
- The Global Structure and Evolution of a Self-Gravitating Multi-phase Interstellar Medium in a Galactic Disk
- The gradient of diffuse gamma-ray emission in the Galaxy
- The multi-phase gaseous halos of star forming late-type galaxies - I. XMM-Newton observations of the Hot Ionized Medium
- Dynamical Evolution and Ionization Structure of an Expanding Superbubble: Application to W4