Parsec-scale Structure in Lobe-dominated Quasars: First Phase-referenced and Polarization-sensitive VLBA Images

Details Parsec-scale Structure in Lobe-dominated Quasars: First Phase-referenced and Polarization-sensitive VLBA Images Parsec-scale Structure in Lobe-dominated Quasars: First Phase-referenced and Polarization-sensitive VLBA Images

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..tss...c05h&link_type=abstract

American Physical Society, 1998 Texas Section Spring Meeting, 19-21 March 1998 San Antonio, Texas, abstract #C.05

Physics

Scientific paper

We are in the midst of a long-term VLBI survey of a complete sample of 25 lobe-dominated quasars (LDQs) drawn from the revised 3CR survey of powerful radio sources. We report here on the first Very Long Baseline Array observations of these objects that employed phase-referencing techniques and dual polarization recording. Seven faint LDQ nuclei -- 3C175, 3C181, 3C190, 3C191, 3C215, 3C336, and 3C351 -- were observed, along with nearby compact calibrators, at 8 GHz in January 1997. All seven of these nuclei were successfully imaged, many using transfer of fringe phase corrections derived from the calibrators, revealing one-sided ``core-jet'' structures. The strong nucleus in 3C245 was observed in dual polarization mode at 5 GHz in June 1996. An unusually long ( ~40 milliarcseconds) one-sided jet appears to have a well-ordered set of electric vectors parallel to its axis. This would imply a transverse magnetic field in the source, counter to what is usually seen in core-dominated quasars. We discuss these results in the context of active galaxy unification models.

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