Bibcode
DOI
Binette, Luc; Prieto, Almudena; Szuszkiewicz, Ewa; Zheng, Wei
Bibliographical reference
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 135-141.
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8
1989
Journal
Citations
50
Refereed citations
41
Description
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.