Mathematics – Logic
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998iraj...25...25u&link_type=abstract
Irish Astronomical Journal, 1998, 25(1), 25
Mathematics
Logic
1
Scientific paper
We re-examine the relative importance of cosmological evolution and luminosity selection effects in the interpretation of the observed dependence of spectral index with redshift in connection with jet-sided asymmetries. We find a very strong correlation between spectral index on the counter-jet side (alphacj) with both redshift and radio luminosity while only a marginally significant correlation is obtained for the jet side (alphaj). We also find that the difference in spectral index asymmetries (Delta alpha = alphacj-alphaj) is marginally correlated with both redshift and luminosity. We show, however, that the observed correlations between spectral index asymmetries and redshift can be completely accounted for by the strong luminosity selection effects present in the sample and therefore have no cosmological implications. This suggests that the observed spectral index asymmetries in lobe-dominated quasars are not consequent upon the interaction of the radio source components with epoch-dependent properties of the ambient medium.
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