Statistics – Methodology
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.1104c&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #11.04; Bulletin of the American Astronomical Society, Vol. 24, p.1134
Statistics
Methodology
Scientific paper
Over the course of several years, high-resolution VLA images of a sample of 79 high-redshift steep-spectrum QSRs have been accumulated. These images are of high quality, and cover three frequencies with complete polarization information. A methodology has been devised to extract numerous astrophysically interesting parameters from these images with a minimum of user-induced bias or error, with the aim of constructing a comprehensive database. We report on the methods employed, and on progress in the database construction. Analysis of the parameter database for a subset of the 79 sources in the sample, at the relatively low angular resolution of 1.2 arcseconds, is briefly described. Despite the preliminary nature of these investigations, several interesting trends have emerged. Radio sources with one-sided jets display a spectral index asymmetry in the lobes, for this subsample, in the sense that jetted lobes have less steep spectra than unjetted lobes. The well-known depolarization asymmetry may be stronger in this sample than in previous samples, suggesting that depolarizing screens at high redshift may have greater Faraday depths than at lower redshifts. The jet spectral index appears to correlate with the jetted lobe spectral index, but not with the unjetted lobe spectral index. These findings would appear to conflict with a simple beaming picture. Conversely, core prominence and jetted hot spot prominence may be correlated, which could be interpreted in terms of modest relativistic beaming in the hot spot, in support of beaming hypotheses.
Barthel Peter D.
Carson Jennifer E.
Lonsdale Colin J.
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