Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..126t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 126-134.
Astronomy and Astrophysics
Astronomy
23
Galactic Nuclei, Galactic Radiation, Seyfert Galaxies, Starburst Galaxies, Ultraviolet Astronomy, Ultraviolet Spectra, Continuous Spectra, H Lines, Iue, Line Spectra, Lyman Alpha Radiation, O Stars, Quasars
Scientific paper
The high excitation emission line galaxies NGC 1667, NGC 5135, and IC 5135 show activity which, while similar to that of Seyfert 2 galaxies, is 1-2 orders of magnitude smaller. The line and continuum emission is in all three cases more extended than would correspond to a point source. In addition to showing such Seyfert-like characteristics as broad, low contrast wings in the Lyman-alpha profiles and unusual strengths in the emission lines of such high ionization species as He II, NGC 5135 and IC 5135 show starburst characteristics in their UV spectra, with P Cygni profiles that furnish direct evidence of the presence of very massive and hot O stars in their nuclei. It is suggested that they may be galaxies undergoing the transition from the starburst stage to the mini-Seyfert stage.
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