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tokens: Based on observations with the 100-m telescope of the MPIfR (Max-Planck-Institut für Radioastronomie) at Effelsberg. This research made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. A.P. is a member of the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics at the Universities of Bonn and Cologne. C.C.-G. acknowledges support by UNAM-DGAPA-PAPIIT grant number IA101214. We thank the Effelsberg operators for the useful help. We acknowledge Roberto Fanti for useful discussions and suggestions and Jochen Heidt for providing us with spectral redshifts of some of the sources. We thank the anonymous referee for careful revising of the paper and useful comments.