Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..135b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 135-141.
Astronomy and Astrophysics
Astrophysics
47
Active Galactic Nuclei, Continuous Radiation, Emission Spectra, Ionizing Radiation, Seyfert Galaxies, Carbon, Lyman Alpha Radiation, Photoionization, Ultraviolet Spectra, X Ray Spectra
Scientific paper
The evolution of the emission line ratios of a photoionized cloud described by standard BLR parameters which is exposed to a varying ionizing continuum is studied. The hardness of the ionizing distribution was varied by decoupling the UV increase from that of the X-ray component. After many tests using various ionizing distributions, it became apparent that the energy distribution must change in certain specific ways if Ly-alpha/C IV is to increase monotonically with f(1338 A) as in Fairall 9. A distribution composed of a varying 10 eV bump and a constant luminosity X-ray power law can successfully reproduce the observed Ly-alpha/C IV slope. This would be consistent with reported X-ray data only if the varying absorbing column density model were a valid explanation of its variability.
Binette Luc
Prieto Almudena
Szuszkiewicz Ewa
Zheng Wei
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