Cosmological evolution and large scale structures of radio
galaxies and quasars
Krzysztof T. Chyzy and Stanislaw Zieba
Astronomical Observatory, Jagiellonian University, ul. Orla
171, Krakow, Poland
The simple unification scheme of powerful radio galaxies and quasars,
based entirely on the orientation dependent effects, has been
confronted with the observed radio structures for 152 radio galaxies
and 173 steep spectrum quasars. Contrary to the scheme's prediction,
the cosmological evolution of geometrical parameters describing
the large scale structure of these two types of radio sources
are different. Linear size, arm ratio asymmetry and bending are
all together stronger evolving with epoch for radio galaxies.
Moreover, linear size and bending are more closely correlated
with radio luminosity for radio galaxies than for quasars. This
supports the supposition that, even if these two AGN classes are
intrinsically identical sets of objects in deep interior regions,
their large scale structures reveal rather various host environmental
conditions which can lead to various classes of objects.
Keywords: cosmology: - galaxies: active - quasars: general
- radio continuum: - galaxies