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| Paper: |
Gigahertz Peaked Spectrum Radio Sources |
| Volume: |
300, Radio Astronomy at the Fringe |
| Page: |
71 |
| Authors: |
Lister, M.L. |
| Abstract: |
The study of compact AGN which possess convex radio spectra (the Gigahertz-peaked spectrum, or GPS sources) has generated a lot of interest over the last four decades, since these objects offer a unique opportunity to probe both the early evolutionary stages of relativistic AGN jets and their immediate nuclear environments. In this article I trace Ken Kellermann's early investigations of these sources, which played a major role in justifying the development of modern-day VLBI techniques. I describe how our understanding of these AGN has progressed since Kellermann's early discoveries, and discuss several ways in which the current classification scheme can be simplified to reflect intrinsic source characteristics, rather than observer-biased quantities. Finally, I discuss recent results from the VLBA 2 cm survey concerning the relativistic jet kinematics of the two-sided peaked-spectrum sources 4C+12.50 (PKS 1345+125) and OQ208(1404+286). |
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