Relation between the ionizing continuum and the emission lines in Fairall 9
Creators
- 1. Beijing Observatory (People's Republic of China)
- 2. Scuola Internazionale Superiore di Studi Avanzati, Trieste (Italy)
- 3. European Southern Observatory, Garching (Germany, F.R.)
- 4. Instituto de Astrofisica de Canarias, La Laguna (Spain)
- 5. Toronto Univ. (Canada)
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. 21 refs
Additional details
Publishing Information
- Journal Title
- Astrophysical Journal
- Journal Volume
- 343
- Series
- Astrophys. J.
- Journal Page Range
- 135-141
- ISSN
- 0004-637X
- CODEN
- ASJOA
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 21012569
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Descriptors DEI
- CARBON; COSMIC GASES; EMISSION SPECTRA; GALAXY NUCLEI; IONIZING RADIATIONS; LYMAN LINES; PHOTOIONIZATION; SEYFERT GALAXIES; ULTRAVIOLET SPECTRA; VARIATIONS; X-RAY SPECTRA
- Descriptors DEC
- ELEMENTS; FLUIDS; GALAXIES; GASES; IONIZATION; NONMETALS; RADIATIONS; SPECTRA