Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..128v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 128-144.
Astronomy and Astrophysics
Astrophysics
66
Elliptical Galaxies, Interstellar Matter, Metallicity, Radiant Cooling, Star Formation, Stellar Winds, Supernovae, Energy Dissipation, Pressure Effects, Stellar Mass Ejection, Stellar Motions
Scientific paper
The generation of galactic winds from star-forming galaxies is investigated. It is shown that the large supernova rates believed to have occurred during the early evolution of elliptical galaxies result in a chemically inhomogeneous two-phase interstellar medium consisting of cool clouds embedded in a hot low-density matrix that occupies most of space. The energy and heavy-element production of supernovae exploding directly in the hot matrix can generate a metal-enhanced galactic wind. Supernova-driven mass loss is found to depend critically on the supernova rate in dwarf galaxies and, in the case of giant ellipticals, on the depth of the potential well. The latter fact suggests the possibility that the transition from giant to dwarf ellipticals is due to the transition from partial to total winds.
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