A model for the variable continuum of the Seyfert 1 galaxy NGC 5548

Details A model for the variable continuum of the Seyfert 1 galaxy NGC 5548 A model for the variable continuum of the Seyfert 1 galaxy NGC 5548

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..148w&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 148-154 (SEE N85-20961 1

Astronomy and Astrophysics

Astronomy

2

Astronomical Models, Nebulae, Seyfert Galaxies, Ultraviolet Spectra, Balmer Series, Iron, Iue, Line Spectra, Power Spectra, Stellar Radiation, Ultraviolet Astronomy

Scientific paper

The variations of NGC 5548 as observed by IUE are analyzed. The results indicate that the amplitude of the variation is largest at the shorter UV wavelengths. The implications of this wavelength dependence are of importance for the continuum modeling. A fit to a simultaneously obtained UV and optical spectra based on the Fe II fluorescence model of Netzer and Wills is shown to give an extremely good match with the data. The results presented show that the spectrum of the Seyfert I galaxy NGC 5548 can be fairly well represented by a combination of a single power law continuum, Fe II lines, Balmer lines, and continuum and stellar variability data suggest that the variations in the strength of the power law spectrum are not accompanied by large changes in the spectral index. Apparent spectral index variations can occur due to the difference in relative importance of individual components at different wavelengths.

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