The Lyman alpha emission of starburst galaxies

Details The Lyman alpha emission of starburst galaxies The Lyman alpha emission of starburst galaxies

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..161v&link_type=abstract

In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 161 (SEE N93-26706 10-90)

Astronomy and Astrophysics

Astronomy

Lyman Alpha Radiation, Populations, Starburst Galaxies, Ultraviolet Spectra, Dust, Sky Surveys (Astronomy)

Scientific paper

Nearby starburst galaxies have consistently shown anomalous Ly-alpha/H-beta ratios. It has been suggested that dust, associated with resonant scattering, quenches the Ly-alpha line by a large factor. However, the observed amount of dust can barely account for the large depletion factors. It is proposed here that a much more important effect is the age of the burst. Normal (i.e., case B recombination) ratios are observed if the galaxy is currently undergoing the burst, while anomalous ratios appear when the galaxy is observed in the post-burst phase. Underlying stellar populations in the UV spectra should therefore be older in the latter case. This scenario explains the presence of Ly-alpha in absorption. Implications for deep surveys are also discussed.

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