Optical emission-line gas in the nuclei of normal galaxies Implications for nuclear activity

Details Optical emission-line gas in the nuclei of normal galaxies Implications for nuclear activity Optical emission-line gas in the nuclei of normal galaxies Implications for nuclear activity

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..159h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Feb. 1986, p. 159-162.

Astronomy and Astrophysics

Astronomy

12

Emission Spectra, Galactic Nuclei, Galactic Radiation, Interstellar Gas, H Ii Regions, Line Spectra, Optical Emission Spectroscopy, Photoionization, Seyfert Galaxies, Visible Spectrum

Scientific paper

The properties of the optical emission-line gas in normal galactic nuclei are reviewed to investigate how common nuclear activity is in normal galaxies. In H II region nuclei, the weakness of the lines from highly ionized species reflects the lack of photons of requisite ionization energy produced by the exciting stars, and the presence of a nuclear spectrum is strongly correlated with a relatively hot stellar population. The gas in Seyferts is modeled as heated and ionized by a central source of high-energy photons, and is shown to be in a highly disturbed state. Evidence for the two models explaining LINER spectra, photoionization by a dilute but energetic continuum source (where nuclear activity is nearly universal), and shock-wave heating (where nuclear activity may not necessarily be manifested), is presented. A Space Telescope spectroscopic and imaging survey of these nuclei will help clarify many of these issues.

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