Statistics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.7105f&link_type=abstract
American Astronomical Society Meeting 208, #71.05; Bulletin of the American Astronomical Society, Vol. 38, p.149
Statistics
Scientific paper
The location and compactness of hot spots have been analyzed in a sample of 15 FR II 3CR radio sources ( 5 radio galaxies [RGs] and 10 quasars [QSRs]) with redshifts greater than 0.3. The overall picture is that the QSRs hot spots are slightly more compact than the RG hot spots. In terms of location, 15 hot spots out of 24 are found to be “edged” hot spots, while the remaining are “recessed” hot spots. We have also found that the jetted sources have more recessed hot spots than the unjetted sources. This is an important point since most of the jetted sources are QSRs. In terms of the standard model and the unification scheme of Barthel, the difference between a QSR and a RG lies in orientation. QSRs are assumed to lie at a smaller angle to the line of sight than RGs. Thus, the recession of a hot spot within the radio lobe of the source may indicate that its position depends on orientation. Our “recessed” hot spots are regular “edged” hot spots, but they are observed “recessed” just because of geometrical projection effects. We will discuss the importance of the hot spots observations and their statistics in terms of their implications for models of radio sources.
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