Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-09-08
Astronomy and Astrophysics
Astrophysics
12 pages, 4 Postscript figures; to appear in the proceedings of ``Dwarf Galaxies and Cosmology'' ed. T.X.Thuan et al. (Edition
Scientific paper
We review the Lyan alpha emission in local star-forming galaxies. In most cases as already shown by the IUE, the emission is absent or much weaker than expected. This occurs because Lyman alpha photons can be resonantly scattered by the neutral gas and destroyed by even very low amounts of dust. However new Hubble Space Telescope observations (HST) indicate that other factors such as the velocity structure of the gas play a crucial role. Gas flows are likely to occur as powered by the kinetic energy released via stellar winds and supernova. We propose a scenario based on the hydrodynamics of superbubbles powered by massive bursts of star formation that naturally accounts for the variety of Lyman alpha line detections in star-forming galaxies. We caution with the attempts to derive the co-moving star formation rate at high redshift from Lyman alpha emission searches.
Kunth Daniel
Tenorio-Tagle Guillermo
Terlevich Elena
Terlevich Robert
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