Spectral classification of emission-line galaxies

Journal Article · Sun Feb 01 00:00:00 EST 1987 · Astrophys. J., Suppl. Ser.; (United States)

DOI:https://doi.org/10.1086/191166· OSTI ID:6323588

Veilleux, S; Osterbrock, D E

A revised method of classification of narrow-line active galaxies and H II region-like galaxies is proposed. It involves the line ratios which 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 Large sets of internally consistent data are used, including new, previously unpublished measurements. Predictions 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. 63 references.

• Research Organization: Lick Observatory, Santa Cruz, CA
• OSTI ID: 6323588
• Journal Information: Astrophys. J., Suppl. Ser.; (United States), Vol. 63
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
CLASSIFICATION
EMISSION SPECTRA
LINE WIDTHS
PHOTOIONIZATION
SEYFERT GALAXIES
IONIZATION
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies