5 Conclusions

We have presented VLA 6 cm and ATCA 3.5 cm radio data for 29 southern Seyfert galaxies selected from a volume limited sample (cz<3600 km s^-1). The resolution of the observations is about $\sim1$$^{\prime\prime}$, similar to that of the ground-based, optical narrow band images. The new radio observations presented in this paper cover more than 50% of our southern ($\delta<0^\circ$) volume limited (cz<3600 km s^-1) sample of Seyfert galaxies. When data available from the literature are added the coverage improves to greater than 80%. Only 2 of the 22 newly observed sources are undetected in our radio observations. Including data from the literature, we find 38% of the distance-limited sample is unresolved at arcsecond resolution, and most of the resolved objects (34% of the sample) show, as expected, a linear structure.

Statistical comparisons are consistent with the picture that Seyferts 1 and 2 arise from the same parent population of AGN, but the radio jets of Seyfert 1 galaxies are smaller in projection owing to their orientation. This model is not contrary to the power-size correlation, but, conversely, projection effects add noise to the measured correlation. An additional prediction is that, binned in radio power, Seyfert 1s should be smaller than Seyfert 2s. Unfortunately, owing to the small number of sources per decade in radio power and the large number of limits at low radio power, we are unable to test this prediction with the current sample.

Acknowledgements

MA acknowledges the support of an Australian Post-Graduate Research Award (APRA). This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, Caltech, under contract with NASA.