Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.278.1069s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 278, p. 1069
Astronomy and Astrophysics
Astronomy
10
Galaxies: Active, Galaxies: Nuclei, Quasars: General, Radio Continuum: Galaxies
Scientific paper
It is shown that at metre wavelengths the fraction of quasars contained in a sample appears to fall rapidly with a decrease in the flux-density level of the sample. This cannot be explained within the simple orientation-based unified scheme with a fixed average value of the half- opening angle (ψ_c_~45^deg^) for the obscuring torus. The absence of a corresponding drop in the ratio of the observed angular sizes of quasars and galaxies with the decreasing flux-density level of the sample makes it particularly difficult to explain within the unified scheme even if we allow for a systematic variation in the value of ψ_c_ with redshift or luminosity. Some implications of these observational results for the recently proposed modified versions of the unified scheme model are discussed.
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