Relation between the ionizing continuum and the emission lines in Fairall 9

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/167691· OSTI ID:5509162

Binette, L; Prieto, A; Szusziewicz, E; Zheng, W ^[1]

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1. Toronto Univ. (Canada)

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. 21 refs.

• OSTI ID: 5509162
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 343; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON
COSMIC GASES
ELEMENTS
EMISSION SPECTRA
FLUIDS
GALAXIES
GALAXY NUCLEI
GASES
IONIZATION
IONIZING RADIATIONS
LYMAN LINES
NONMETALS
PHOTOIONIZATION
RADIATIONS
SEYFERT GALAXIES
SPECTRA
ULTRAVIOLET SPECTRA
VARIATIONS
X-RAY SPECTRA