LUMINOSITY SELECTION EFFECTS ON THE LINEAR SIZE EVOLUTION WITH COSMIC EPOCH OF COMPACT STEEP SPECTRUM SOURCES

Abstract

In this paper, we used statistical methods of analysis to show extents of luminosity selection effects on the linear
size evolution (with cosmic epoch) of Compact Steep Spectrum (CSS) sources and the implication on the
quasar/galaxy unification. Results suggest that while CSS quasars and galaxies have similar distributions in the
luminosity-redshift plane above certain redshift (ð’› > 0.3) cut-off, the quasars suffer much more luminosity
selection effects than the galaxies. However, it is not surprising to have the effects much stronger in the CSS
quasars, because, it may have originated from the predominance of relativistic beaming effects in quasars due
to the alignment of their jet axes in the observer's line of sight. These results support quasar/galaxy unification
scheme in which the two subclasses of objects should appear identical in all their independent characteristics.