Physics
Scientific paper
Mar 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..tssap2001h&link_type=abstract
American Physical Society, Texas Section APS/AAPT/SPS Joint Spring Meeting, March 23-25, 2006, abstract #APS.200
Physics
Scientific paper
There is a well-known dichotomy of radio galaxies: low- luminosity ``FR I'' objects have edge-darkened structures with twin kiloparsec-scale jets, while high-luminosity ``FR II'' sources have edge-brightened structures with one-sided kiloparsec-scale jets. The ``magnetic switch'' model of Meier et al. (1997, Nature, 388, 350) predicts that parsec-scale jet speeds will be slower (0.6c) in ``FR I'' objects and faster (>0.98c) in ``FR II'' sources. To test this model, we made high-resolution 8.4-GHz VLBA observations of the ``FR I'' radio galaxies 3C31, 3C76.1, 3C296, and 3C449 on 2003 August 13. All four objects have compact cores. 3C31 and 3C296 show well- resolved jet structures on the scale of about 1 pc, with possible counterjet features. Analyses of the current images suggest that the jets lie at large angles (75-80 degrees) to our line of sight, but do not provide strong constraints on jet speeds. Future observations are planned for direct measurements of jet speeds.
Aars Christian
Ecklund Tait
Hough David
Lester William
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