Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-03-05
Astronomy and Astrophysics
Astrophysics
6 pages, 1 figure, Accepted for publication in the Proceedings of The Eighth Texas-Mexico Conference on Astrophysics: Energeti
Scientific paper
We stress some of the major differences between supergalactic winds and giant superbubbles evolving into the giant low density haloes of galaxies. We review major properties of bursts of star formation and the critical energy required for mass ejection both in the case of an ISM strongly flattened by rotation and that imposed by a more extended ISM distribution arising from a smaller rotation. The limits are thus establish for galaxies with an ISM mass in the range 10$^6$ M$_\odot$ to more than 10$^9$ M$_\odot$, and are compared with a sample of local galaxies. Some of these galaxies seem to be above the critical limit despite the fact that their structure is clearly that of a superbubble. True supergalactic winds, as evidence by M82, are shown to exceed the critical limit by more than an order of magnitude and thus the limit derived by Silich & Tenorio-Tagle (2001) for mass ejection should be regarded as a lower limit.
Munoz-Tunon Casiana
Silich Sergiy
Tenorio-Tagle Guillermo
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