An optical and radio survey of the nuclei of bright galaxies - Stellar populations and normal H II regions

Details An optical and radio survey of the nuclei of bright galaxies - Stellar populations and normal H II regions An optical and radio survey of the nuclei of bright galaxies - Stellar populations and normal H II regions

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..142h&link_type=abstract

Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 142-151. Research supported by the University of Washington.

Astronomy and Astrophysics

Astronomy

131

Abundance, Galactic Nuclei, H Ii Regions, Metallic Stars, Radio Astronomy, Star Distribution, Absorption Spectra, Continuous Spectra, Galactic Radiation, Galactic Structure, Heavy Elements, Interstellar Extinction, Light (Visible Radiation), Line Spectra, Stellar Evolution, Stellar Magnitude

Scientific paper

The natures of stellar populations and normal H II regions in galactic nuclei are discussed with regard to the results of an optical spectrophotometric and radio continuum survey of a sample of the nuclei of bright galaxies. Age and metal abundance effects in the stellar population are considered, and it is found that the inversely correlated strengths of the metallic and Balmer lines in galactic nuclei are caused primarily by variations in the relative content of young stars rather than by metal abundance. In addition, within a given Hubble type, the formation of young stars in the nucleus is encouraged by a weak central concentration of light (the Yerkes class) but is not influenced by the galaxy dynamics. Strong evidence is also found for a correlation between nuclear metal abundance and galaxy absolute magnitude for late-type galaxies based on the H II region spectra.

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