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Spectral Properties of AGN with Very Weak [O III] Lines

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Author(s): Kovacevic, J.

Journal: Serbian Astronomical Journal
ISSN 1450-698X

Volume: 182;
Start page: 17;
Date: 2011;
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Keywords: Galaxies: active | Galaxies: emission lines

ABSTRACT
The spectral properties of a sample of 58 Active GalacticNuclei (AGN) spectra, in which emission [O~III] $lambdalambda$4959, 5007 AA lines are weak or totally absent, are analyzed. In order to investigate thephysical reason for the [O~III] emission suppression, the spectral propertiesof the weak [O~III] spectra sample are compared with the same properties of asample of 269 spectra with the strong [O~III] lines. The spectra are obtainedfrom Sloan Digital Sky Survey (SDSS) Database. It is found that the objectswith the weak or absent [O~III] $lambdalambda$4959, 5007 AA linesgenerally have the high continuum luminosities (log($lambda$L$_{5100}$) $>$45), that they are very rare at smaller redshifts ($z

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