Spectral classification of emission-line galaxies

Details Spectral classification of emission-line galaxies Spectral classification of emission-line galaxies

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2466..737v&link_type=abstract

Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, June 16

Astronomy and Astrophysics

Astronomy

1

Emission Spectra, Galactic Nuclei, Interstellar Extinction, Line Spectra, Active Galaxies, Astronomical Models, Flux Density, H Ii Regions, Photoionization, Power Spectra, Star Formation

Scientific paper

A revised method of classification of narrow line active galaxies and H II region-like galaxies is proposed. It involves the line ratios (O III) lambda 5007/H beta, (N II) lambda 6583/H alpha, (S II) (lambda lambda 6716 = 6731)/H alpha, and (O I) lambda 6300/H alpha. These line ratios take full advantage of the physical distinction between the two types of objects and minimize the effects of reddening correction and errors in the flux calibration. Large sets of internally consistent data are used including new previously unpublished measurements. Prediction of recent photoionization models by power law spectra and by hot stars are compared with the observations. The classification is based on the observational data interpreted on the basis of these models.

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