Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1034s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1034-1045.
Astronomy and Astrophysics
Astronomy
42
Emission Spectra, Galactic Radiation, Line Spectra, Seyfert Galaxies, Starburst Galaxies, Galactic Nuclei, Galactic Structure, Star Formation
Scientific paper
The galaxy IC 5135 is host for Seyfert activity and vigorous star formation in its nucleus. Results of a study based on optical spectroscopy and imaging are presented that reveal the ionization properties of the nucleus and near-nucleus region, as well as the global morphology of this galaxy. The dual nature of the nucleus is evident in emission-line profiles, which show two kinematic components. Line intensity ratios in the nucleus are typical of Seyfert 2 galaxies, but evolve with increasing radius to values generally characteristic of H II regions. IC 5135 provides an illustration of the importance of the O I 6300 forbidden line as a tracer of a hard-spectrum, photoionizing continuum; the presence at large radii of ionizing radiation from nucleus is clearly revealed by the relative strength of this line.
Filippenko Alexei V.
Shields Joseph C.
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