Multi-Wavelength Observations of FR II Radio Galaxies and Quasars

Ilias Fernini

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Two statistically complete samples of 13 Fanaroff-Riley type II (FR II) radio galaxies (RGs) and 13 FR II quasars (QSRs) were observed at 3.6, 6, and 20 cm. At 6 cm, the two samples were compared in terms of the 1989 unification scheme of Barthel. Definite radio jets were detected in two RGs and candidate jets or jet components in four other RGs. These results are in strong contrast to the quasars sample, where radio jets were found in all QRSs in addition to six candidate counterjets. This jet detection is consistent with the prediction of the unification scheme. Using the 6 and 20 cm observations, the two samples were compared in terms of their depolarization properties. We found no statistically significant difference between the distribution of depolarization asymmetries in the RGs and QSRs. At 3.6 cm, the RGs and QSRs were compared in terms of the compactness and location of their hot spots on the jet and counterjet side. We have compared the largest linear size and the smallest linear size of each hot spot. The overall picture is that the QSRs hot spots are slightly more compact than the RG hot spots. In terms of location, more hot spots are edged than recessed with the jetted sources showing more recessed hot spots than the unjetted sources. We will discuss the importance of these multi-wavelength observations in terms of their implications for models of radio sources.
Original languageEnglish
Title of host publicationProceedings of the Extragalactic Jets Conference: From Radio to Gamma Rays (Girdwood, USA), eds. T.A. Rector & D. S. de Young, ASP Conf. Series Vol. 386, 120, 2008.
PublisherASP Conferences Series Vol. 386
Publication statusPublished - 2008
EventFrom Radio to Gamma Rays - Girdwood, Alaska (USA)
Duration: Jan 1 2007 → …


ConferenceFrom Radio to Gamma Rays
Period1/1/07 → …


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