Lyman-alpha emission in star-forming galaxies - Low-redshift counterparts of primeval galaxies?

Details Lyman-alpha emission in star-forming galaxies - Low-redshift counterparts of primeval galaxies? Lyman-alpha emission in star-forming galaxies - Low-redshift counterparts of primeval galaxies?

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l..39c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 1, p. L39-L42.

Astronomy and Astrophysics

Astrophysics

39

Lyman Alpha Radiation, Markarian Galaxies, Red Shift, Starburst Galaxies, Emission Spectra, Interstellar Extinction, Magellanic Clouds, Metallicity, Visible Spectrum

Scientific paper

The Ly-alpha flux and the Ly-alpha/H-beta line ratio of three metal-poor blue galaxies, Mrk 496, Mrk 357, and Tol 1924-416 are analyzed here using archival IUE spectra together with new optical spectra obtained in an aperture which matches the size of the IUE aperture. Dereddened Ly-Alpha/H-beta ratios roughly constant over the range of metallicities are derived. The lack of correlation between the dereddened ratios and metallicity implies that the effects of pure dust extinction are not negligible, in contrast to conclusions reached elsewhere, and play an important role in determining the observed ratio. It is also found that the dereddened Ly-alpha/H-beta ratios are consistent within the uncertainties with the theoretical case B recombination value for nebular emission. Selective absorption by dust of the Ly-alpha photons in the presence of multiple scattering within extended uniform H I regions seems to be ruled out by the results.

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