Bach, U.U.BachRAITERI, Claudia MariaClaudia MariaRAITERIVILLATA, MassimoMassimoVILLATAFuhrmann, L.L.FuhrmannBUEMI, CARLA SIMONACARLA SIMONABUEMILarionov, V.M.V.M.LarionovLETO, PAOLOPAOLOLETOArkharov, G.A.A.G.A.A.ArkharovColoma, J.M.J.M.ColomaDI PAOLA, AndreaAndreaDI PAOLADOLCI, MauroMauroDOLCIEfimova, N.N.EfimovaForné, E.E.FornéIbrahimov, M.A.M.A.IbrahimovHagen-Thorn, V.V.Hagen-ThornKonstantinova, T.T.KonstantinovaKopatskaya, E.E.KopatskayaLANTERI, LucianoLucianoLANTERIKurtanidze, O.M.O.M.KurtanidzeMACCAFERRI, GiuseppeGiuseppeMACCAFERRINikolashvili, M.G.M.G.NikolashviliORLATI, ANDREAANDREAORLATIRos, J.A.J.A.RosTosti, G.G.TostiTRIGILIO, CORRADOCORRADOTRIGILIOUMANA, Grazia Maria GloriaGrazia Maria GloriaUMANA2023-01-242023-01-2420070004-6361http://hdl.handle.net/20.500.12386/33049Context: Being dominated by non-thermal emission from aligned relativistic jets, blazars allow us to elucidate the physics of extragalactic jets, and, ltimately, how the energy is extracted from the central black hole in radio-loud active galactic nuclei. Aims: Crucial information is provided by broad-band spectral energy distributions (SEDs), their trends with luminosity and correlated multi-frequency variability. With this study we plan to obtain a database of contemporaneous radio-to-optical spectra of a sample of blazars, which are and will be observed by current and future high-energy satellites. Methods: Since December 2004 we are performing a monthly multi-frequency radio monitoring of a sample of 35 blazars at the antennas in Medicina and Noto. Contemporaneous near-IR and optical observations for all our observing epochs are organised. Results: Until June 2006 about 4000 radio measurements and 5500 near-IR and optical measurements were obtained. Most of the sources show significant variability in all observing bands. Here we present the multi-frequency data acquired during the first eighteen months of the project, and construct the SEDs for the best-sampled sources.STAMPAenArticle10.1051/0004-6361:200665612-s2.0-33947186164https://www.aanda.org/articles/aa/abs/2007/10/aa6561-06/aa6561-06.htmlhttp://www.scopus.com/inward/record.url?eid=2-s2.0-33947186164&partnerID=MN8TOARS2007A&A...464..175BFIS/05 - ASTRONOMIA E ASTROFISICA