Extragalactic H II regions in the UV - Implications for primeval galaxies

Details Extragalactic H II regions in the UV - Implications for primeval galaxies Extragalactic H II regions in the UV - Implications for primeval galaxies

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l.109m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, June 15, 1981, p. L109-L113. Research supported by the Science

Astronomy and Astrophysics

Astronomy

71

Galactic Evolution, H Ii Regions, Intergalactic Media, Nebulae, Ultraviolet Astronomy, Balmer Series, Iue, Lyman Alpha Radiation, Stellar Evolution, Ultraviolet Spectra

Scientific paper

Three extragalactic regions of rapid star formation with redshifts great enough to separate the Lyman-alpha region from geocoronal Lyman-alpha have been observed with the IUE satellite. Only the low metal abundance object had detectable Lyman-alpha emission with Lyman-alpha/H-alpha of about 6; the other two have Lyman-alpha/H-alpha less than 0.6 (2 sigma). In the normal metallicity objects, there is some evidence for Lyman-alpha extinction in addition to that computed from the Balmer decrement. Lyman-alpha is therefore expected to be weak or absent in collapsed primeval galaxies because of their predicted moderate to high metallicity.

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