Longterm radio behaviour of GPS sources and candidates

This paper is a summary of the work that our group has done and recently published in several papers on longterm radio variability of GPS sources. We have studied the longterm up to 30 years variability of GPS sources and candidates, with emphasis on the highfrequency radio domain. Our data sets show that only a relatively small number of these sources retain their convex spectra when they are monitored densely and for long periods of time. The current GPS samples are especially contaminated by small, beamed blazartype sources. Also the remaining population with consistently convex GPStype spectra seems to be heterogeneous, falling into several subpopulations when their observed properties are used for clustering them through a selforganizing map © 2009 WILEYVCH Verlag GmbH & Co. KGaA, Weinheim