From Fairall 9 to high-z objects - Pattern of change in ionization structure

Details From Fairall 9 to high-z objects - Pattern of change in ionization structure From Fairall 9 to high-z objects - Pattern of change in ionization structure

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392...74z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 74-79. Research supported by NSF, Institute f

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19

Active Galactic Nuclei, Photoionization, Seyfert Galaxies, Ultraviolet Spectra, Continuous Spectra, Emission Spectra, Forbidden Transitions, Iron, Iue, Line Spectra, Magnesium, Spectrum Analysis

Scientific paper

Results of a study of 79 IUE spectra of the Seyfert galaxy Fairall 9 are presented. A significant change in the UV bump flux was found between 1826 and 3075 A. Since the UV bump exhibits a more pronounced variation than the X-ray and optical continuum, the UV continuum is harder at high states. It is suggested that the optical and the X-ray flux could be approximated by a single power law originating from a common physical mechanism. Both strong and weak emission lines show differential line variations as the continuum varies. The amplitude of the variations is inversely correlated with the energy of the photons responsible for exciting the emitting ions. The UV bump appears to affect more directly lines with an ionization potential between 1 and 3 Ry. In the order of increasing ionization potential, the luminosity dependence of emission-line equivalent width increases. This trend is present not only in F9 but also in the statistics of AGN.

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