Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254...15n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Jan. 1, 1992, p. 15-20. Research supported by USIB
Astronomy and Astrophysics
Astronomy
43
Active Galactic Nuclei, Continuous Spectra, Line Spectra, Quasars, Spectral Correlation, Accretion Disks, Carbon, Luminosity, Lyman Alpha Radiation, Photoionization
Scientific paper
A very large sample of Active Galactic Nuclei (AGNs) is analyzed, and several of the observed line and continuum correlations are discussed. It is shown that the luminosity of the Ly alpha and C IV lambda 1549 lines do not increase as fast as the continuum luminosity, and that the slope of the Baldwin relationship is a function of the luminosity range of the sample under study. Thin AGN accretion disks can provide one explanation for those correlations, by computing the continuum emitted by such systems and combining it with photoionization model calculations for the BLR. The agreement between the observed and the theoretical line correlations is very good, especially for Ly alpha. In particular, there is no need to invoke a luminosity-dependent covering factor, since higher luminosity disks are predicted to emit softer ionizing continuum. The alternative explanation involves line and continuum variability.
Gondhalekar P. M.
Laor Ari
Netzer Hagai
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