SIMBAD references

2014AJ....148...16S - Astron. J., 148, 16 (2014/July-0)

Discordance of the unified scheme with observed properties of quasars and high-excitation galaxies in the 3CRR sample.


Abstract (from CDS):

We examine the consistency of the unified scheme of Fanaroff-Riley type II radio galaxies and quasars with their observed number and size distributions in the 3CRR sample. We separate the low-excitation galaxies from the high-excitation ones, as the former might not harbor a quasar within and thus may not be partaking in the unified scheme models. In the updated 3CRR sample, at low redshifts (z < 0.5), the relative number and luminosity distributions of high-excitation galaxies and quasars roughly match the expectations from the orientation-based unified scheme model. However, a foreshortening in the observed sizes of quasars, which is a must in the orientation-based model, is not seen with respect to radio galaxies even when the low-excitation galaxies are excluded. This dashes the hope that the unified scheme might still work if one includes only the high-excitation galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: nuclei - quasars: general

VizieR on-line data: <Available at CDS (J/AJ/148/16): table1.dat>

Simbad objects: 138

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2014AJ....148...16S and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact