Milli-Arcsecond Morphology and Structural Changes in a Complete Sample of Radio Sources

Details Milli-Arcsecond Morphology and Structural Changes in a Complete Sample of Radio Sources Milli-Arcsecond Morphology and Structural Changes in a Complete Sample of Radio Sources

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.4408p&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #44.08; Bulletin of the American Astronomical Society, Vol. 25, p.869

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Scientific paper

We have conducted a VLBI survey of a complete, flux-density--limited sample of 65 extragalactic radio sources, selected at 5 GHz, in order to study their morphology and to look for superluminal motion and other structural changes. First-epoch images of 37 sources were published by Pearson & Readhead (1988, ApJ, 328, 114). Here we present 5-GHz images, with a resolution ~ 1 milliarcsec, taken at three epochs spread over 9 years for each of 25 sources. The majority of the sources have an asymmetric, core-jet morphology. Several of these are superluminal sources in which an emission feature moves outward along the jet at v_app > c (e.g., 0850+581, 1642+690, 1928+738, BL Lac, 3C 216, 3C 345). Several other sources with similar morphology, however, show no changes in relative positions of subcomponents, although subcomponent flux densities do change (e.g., 0711+356, 1652+398, 1823+568). We draw attention to a new class of ``compact symmetric'' objects with double or triple morphology (e.g., 0108+388, 0710+439, 2352+495). We have placed limits < c on relative motion of components in these sources, and they show little if any evidence for relativistic beaming. The central engine appears to lie midway between two lobes ~ 100 pc apart. The sample also includes some compact steep-spectrum sources and other sources that are difficult to classify.

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