VLBA Observations of Low-luminosity Radio Galaxies

Details VLBA Observations of Low-luminosity Radio Galaxies VLBA Observations of Low-luminosity Radio Galaxies

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312205b&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #122.05; Bulletin of the American Astronomical Society, Vol. 31, p.665

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We are engaged in a VLBI survey of a complete sample of 22 low-luminosity (Fanaroff & Riley Type I) radio galaxies. We report here on 5 GHz images of the nuclei in 13 of these objects derived from observations made with the VLBA (plus, in some instances, the VLA) between 1991 June and 1995 October. These images typically have milliarcsecond resolution and, in all cases but one, reveal a one-sided ``core-jet'' morphology as is often found in powerful radio galaxies and quasars. The one exception is 3C338, which has a two-sided jet. Two-epoch observations in four cases suggest very weak upper limits on apparent tranverse jet speeds of 3c. An analysis of lower limits on jet-to-counterjet brightness ratios in terms of simple relativistic jet models indicates that the bulk Lorentz factors could be as low as 1.2. We consider implications of these results for active galaxy unification models. This work has been supported under NSF grants AST-9422075 and AST-9420018.

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