2001/02/27 by Miguel A. de Avillez, Mordecai-Mark Mac Low · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/319842
Accepted for publication in ApJ Letters. Latex manuscript, 3 figures (4 postsript files)
arxiv created 2001/02/27 · openalex publication_date 2001/04/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Recent H I emission observations of the southern Galactic hemisphere have revealed a mushroom-like structure extending from z = −70 to −450 pc, composed of a stem and a cap. Similar structures occur in three-dimensional simulations of a dynamic galactic disk driven by isolated and clustered supernovae. Using these simulations, we show that hot gas in the Galactic disk that is not evacuated through chimneys expands into the cooler gas of the thick disk, forming mushroom-shaped structures. This new class of objects traces buoyant flow of hot gas into the thick disk.