Long-slit optical spectroscopy of powerful far-infrared galaxies - The nature of the nuclear energy source

Details Long-slit optical spectroscopy of powerful far-infrared galaxies - The nature of the nuclear energy source Long-slit optical spectroscopy of powerful far-infrared galaxies - The nature of the nuclear energy source

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..727a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 727-742. Research supported by NASA.

Astronomy and Astrophysics

Astronomy

194

Absorption Spectra, Early Stars, Galactic Nuclei, Infrared Sources (Astronomy), Optical Emission Spectroscopy, Visible Spectrum, Balmer Series, Emission Spectra, H Alpha Line, Interstellar Extinction, Line Shape, Spectral Line Width

Scientific paper

Optical spectroscopic data are presented for a sample of 47 powerful far-IR galaxies chosen for IR spectral shape, and for six other IR-bright galaxies. The stellar absorption lines expected from a population of old stars are generally very weak in the nuclei of the galaxies. Very weak Mg I absorption is found in regions well off the nucleus, implying that the visible spectrum is dominated by young stars and not by an AGN. At least one, and probably five, of the galaxies have detectable WR emission features, providing additional evidence for a young stellar population. About 20 percent of the galaxies have strong Balmer absorption lines, indicating the presence of a substantial intermediate-age stellar population. The equivalent width of the H-alpha emission line can be modeled as arising from a mixture of a large young population and an intermediate-age population of stars.

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