Variability of the emission-line spectra and optical continua of Seyfert galaxies. I

Details Variability of the emission-line spectra and optical continua of Seyfert galaxies. I Variability of the emission-line spectra and optical continua of Seyfert galaxies. I

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...49..469p&link_type=abstract

Astrophysical Journal Supplement Series, vol. 49, July 1982, p. 469-486.

Astronomy and Astrophysics

Astrophysics

68

Emission Spectra, Line Spectra, Oxygen Spectra, Photoionization, Seyfert Galaxies, Spectrophotometry, Data Reduction, Luminosity, Spectrum Analysis, Variability

Scientific paper

H-beta and O III forbidden line 4959,5007 A line strengths obtained from new observations of 27 broad line-emitting galaxies and six narrow line-emitting galaxies are compared with earlier measurements. It is found that about 80% of broad line-emitting galaxies show significant changes in their optical spectra, on time scales of less than about five years. An analysis of changes in O II forbidden line/H-beta ratio for 24 broad line-emitting galaxies shows that (1) changes in the H-beta flux are correlated with changes in the optical continuum, providing evidence for energy input into the line-emitting region by photoionization, and (2) in a number of galaxies, the structure of the broad emission lines in complex, with detailed line structure changes on time scales shorter than about two months.

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