Parsec-scale structure in the nuclei of double lobed radio quasars

Details Parsec-scale structure in the nuclei of double lobed radio quasars Parsec-scale structure in the nuclei of double lobed radio quasars

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phdt.........5h&link_type=abstract

Ph.D. Thesis California Inst. of Tech., Pasadena.

Astronomy and Astrophysics

Astronomy

13

Astrometry, Quasars, Radio Astronomy, Radio Galaxies, Galactic Nuclei, Stellar Parallax, Very Long Base Interferometry

Scientific paper

A complete sample of double lobed quasars is defined, which is believed to be randomly oriented and which contains many objects with central components accessible to very long baseline interferometry (VLBI). The purpose of defining the sample in this way is to facilitate tests of physical models proposed to explain both the compact and extended structures in extragalactic radio sources. Statistical studies of the properties of these objects on the > approx. kiloparsec scale are consistent with the assumption of random orientations and the simple relativistic beaming theory. The central components of six double lobed quasars were mapped at high resolution and high sensitivity with VLBI. Each object exhibits a double or extended structure on the approx. parsec scale. This structure can be interpreted as a core jet, the same morphology found in the dominant cores of powerful flat spectrum sources, thus indicating a relation between the two classes of compact radio source. The presumed VLBI jets are all fairly well aligned with > approx. kiloparsec scale, one sided jets. The fact that the VLBI and large scale jets always lie on the same side of the compact core suggests the same cause for the assymmetric structure on both scales.

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