Journal
NEW ASTRONOMY REVIEWS
Volume 47, Issue 4-5, Pages 205-209Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S1387-6473(03)00026-5
Keywords
galaxies : active; radio continuum : galaxies
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Evidence for the Receding Torus Model for radio-loud AGN comes from two main sources: (i) the rise in quasar fraction with emission-line luminosity; and (ii) the difference in emission-line luminosity between radio galaxies and radio quasars. We have constructed a new type of luminosity function which shows that a two-population model, with a low-luminosity population of radio galaxies and a high-luminosity population composed of radio galaxies and radio quasars, can mimic the effects of a receding torus. The data are best explained, however, by a two-population model with a receding torus in both populations. (C) 2003 Elsevier B.V. All rights reserved.
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