AAS 201st Meeting, January, 2003
Session 48. Blazars and AGNs
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[48.17U] VLBI Polarimetry of 177 Compact, Flat-Spectrum Sources

L.K. Pollack (NRAO/UCB), G.B. Taylor (NRAO), R.T. Zavala (NRAO/NMSU)

We present VLBA observations and a statistical analysis of 5 GHz VLBI polarimetry data from 177 sources in the complete, flux-density-limited Caltech-Jodrell Bank flat-spectrum (CJF) survey. We compare a broad range of source properties for quasars, galaxies and BL Lacertae objects, with an emphasis on their jet properties. We find that the electric vector position angle in quasar cores is preferentially oriented perpendicular to the jet axis. Furthermore the correlation is found to be even stronger for those quasars with short projected jet lengths. Contrary to previous claims in the literature, no correlation is found between the jet polarization angle and the jet axis in either quasars or BL Lac objects. With this large, homogeneous sample we also examine the size-redshift relation. While consistent with Friedmann cosmologies, these observations do not provide any meaningful constraints on the deceleration parameter. We also use our sample to search for source evolution, but find no strong trends. Based on these results we suggest that the formation and evolution of parsec-scale radio jets function independently of the large scale (> 1 kiloparsec) conditions.

LKP acknowledges support from the Research Experience for Undergraduates (REU) program at NSF.

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Bulletin of the American Astronomical Society, 34, #4
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