Mathematics – Logic
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt..........j&link_type=abstract
PhD Thesis, Jagiellonian University
Mathematics
Logic
Extragalactic Radio Sourcecs, Radio Source Counts, Cosmological Evolution
Scientific paper
In this work I attempted to investigate cosmological evolution of powerful extragalactic radio galaxies in terms of the dual-population model (Jackson & Wall 1999), where radio sources of Fanaroff-Riley (1974) types I and II are regarded as two physically separate types of Active Galactic Nuclei (AGN). Radio source counts and redshift distributions at 408 MHz and 1.4 GHz of radio galaxies of FRI and FRII classes with extended and compact morphologies in the flux density range between 0.02 and 20 Jy are provided here. The observational distributions are presented just for two frequencies, where the FIRST, NVSS and WENSS maps provide most of the available morphological data on weak sources. The dual-population numerical model predicted counts are compared with the observational data to find the best-fitting evolution and beaming parameter values, as well as to improve the model itself. The new approach, which assume the existence of only two types, i.e. FRI and FRII, of radio sources as parent population for all powerful extragalactic radio structures turns out to yields quite satisfactory results.
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