Winds from dwarf galaxies and Lyman-alpha absorption features in quasar spectra

Astronomy and Astrophysics – Astronomy

Scientific paper

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Absorption Spectra, Cosmic Gases, Galactic Evolution, Galactic Structure, Lyman Alpha Radiation, Quasars, Astronomical Models, Line Spectra, Lyman Spectra, Night Sky, Red Shift, Sky Brightness, Spectral Energy Distribution

Scientific paper

If the mass shedding through which gas-poor dwarf galaxies have evolved was caused by galactic wind, the diffuse gas clouds surrounding this class of galaxies could give rise to the weak Lyman-alpha absorption lines observed in the spectra of high-redshift quasars. A model predicated on this principle is described and shown to reproduce all observed Lyman-alpha absorption line features. It is noted that profiles with two symmetric minima and a central hump, which would constitute a significant fraction of the lines produced by this mechanism, should be observable.

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