The broad emission line and continuum variations of Seyfert galaxies. I - Time scales and amplitudes

Details The broad emission line and continuum variations of Seyfert galaxies. I - Time scales and amplitudes The broad emission line and continuum variations of Seyfert galaxies. I - Time scales and amplitudes

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...81...59r&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 81, no. 1, July 1992, p. 59-81.

Astronomy and Astrophysics

Astrophysics

32

Emission Spectra, Seyfert Galaxies, Active Galactic Nuclei, Astronomical Observatories, Astronomical Spectroscopy, Balmer Series, H Lines

Scientific paper

Spectroscopic observations of 13 Seyfert 1 galaxies made from 1979 to 1984 at Palomar and Steward Observatories were analyzed for Balmer-line and optical continuum variability. The majority of the galaxies showed significant variations, particularly in the continuum. Typical peak-to-peak changes for H-beta and H-gamma integrated line fluxes were 100-200 percent, while the continua varied by 200-350 percent. In several cases, Balmer-line and continuum variations were found to be strongly correlated, as expected for photoionization by a central continuum source. However, these correlations were found to be highly nonlinear. Significant correlations were found between variability amplitude and global AGN properties such as luminosity. Moreover, a significant number of variations occurring on short time scales constrains the size of the broad-line region in Seyfert galaxies to about 90 lt-days across or less.

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