Ultraviolet variability of NGC 5548 - Dynamics of the continuum production region and geometry of the broad-line region

Details Ultraviolet variability of NGC 5548 - Dynamics of the continuum production region and geometry of the broad-line region Ultraviolet variability of NGC 5548 - Dynamics of the continuum production region and geometry of the broad-line region

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..541k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 20, 1991, p. 541-562.

Astronomy and Astrophysics

Astronomy

260

Galactic Nuclei, Galactic Radiation, Line Spectra, Seyfert Galaxies, Ultraviolet Spectra, Continuous Radiation, Emission Spectra, Iue, Power Spectra, Spectrum Analysis, Ultraviolet Astronomy

Scientific paper

Data from the 1989-1990 IUE monitoring of the Seyfert galaxy NGC 5548 are used here to analyze the continuum variability properties of the galaxy and to derive the structure or its emission-line region. The mean shape of the UV continuum is well fit by an accretion disk model with a given black hole mass and an additional component required to reproduce the observed soft X-ray flux. The continuum fluctuation power spectrum is very steep, with most of the variance coming from about 1 yr time scales. The entire optical/UV continuum rises and falls almost simultaneously, so that the logarithmic slope of the power spectrum is nearly the same for all bands, but the flux at higher photon frequencies varies with larger amplitude. The emission-line material around the nucleus may best be described by a highly ionized inner zone of high and nearly constant pressure that stretches about 4-14 light-days from the center and an outer, more weakly ionized zone of considerably lower ionization at least 20-30 light-days out.

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