J/A+A/702/A140ivo://CDS.VizieR/J/A+A/702/A140doi:10.26093/cds/vizier/bc-ny/lbeaCDSMarchili N.Righini S.Giroletti M.Raiteri C.M.Giri R.P.,Carnerero M.I.Villata M.Bach U.Cassaro P.Liuzzo E.Buemi C.S.,Leto P.Trigilio C.Umana G.Bonato M.Patricelli B.Stamerra A.2026-08-03T06:57:49Z2025-10-15T08:46:36ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frbl-lacertae-objectsquasarsradio-continuum-emissionThe extreme variability of blazars, in both timescale and amplitude, is generally explained as the effect of a relativistic jet closely aligned to the observer's line-of-sight. Due to causality arguments, variability characteristics translate into spatial information about the emitting region of blazars. Since radiation at different wavelengths is emitted in different parts of the jet, multi-frequency observations provide us with a virtual view of the structure of the jet on different scales. Radio-gamma-ray correlations, moreover, are essential to reveal where and how the high-energy radiation is produced. We present here the observations collected within the blazar radio monitoring program that we are running at the Medicina and Noto telescopes. It aims at investigating how the variability characteristics and spectral energy distribution of blazars evolve in time. Since 2004, observation have been performed at 5, 8, 24, and 43GHz on 47 targets, with monthly cadence; the monitoring program is still active at frequencies of 8 and 24GHz. The database we built in more than twenty years of activity comprises to date about 21000 flux density measurements. Some basic analysis tools have been applied to the data to characterise the detected variability and offer a first glance at the wealth of information that such a program can provide about blazars.2025A&A...702A.140Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A140CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/702/A140https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/702/A140http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/702/A140https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/702/A140https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/702/A140http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/702/A140GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/702/A140/tablea1 (Basic information about the sources included in the Blazar IRA Monitoring programme)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/702/A140/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/702/A140/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/702/A140/tablea1?GETtext/xml+votable180.050000true35.66543.03550.0055555555555555566/579 893 1701 1782 2414 4285 4695 4770 4820 5423 7570 7896 7969 8858 9003 9442 9460 9612 9633 13820 13927 15067 15969 16059 18661 19398 19609 20099 21935 21972 22950 23015 23099 23121 24084 25630 26131 26292 28083 28479 28492 29072 29570 29675 31663-31664 449083.313034785154005e-24 2.8492099152324443e-23https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/702/A140?format=asciiRadiodefaultJ/A+A/702/A140/tablea1Basic information about the sources included in the Blazar IRA Monitoring programmerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (HHMM+DDd)meta.id;meta.maincharANameAlternative namemeta.idcharTypeBlazar typesrc.classcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatN(5GHz)Number of datapoints at 5GHzmeta.numberintS(5GHz)? Average flux density at 5GHzJyphot.flux.density;em.radio.3-6GHzfloatnullableN(8GHz)Number of datapoints at 8GHzmeta.numberintS(8GHz)Average flux density at 8GHzJyphot.flux.density;em.radio.6-12GHzfloatN(24GHz)Number of datapoints at 24GHzmeta.numberintS(24GHz)Average flux density at 24GHzJyphot.flux.density;em.radio.12-30GHzfloatN(43GHz)Number of datapoints at 43GHzmeta.numberintS(43GHz)? Average flux density at 43GHzJyphot.flux.density;em.mm.30-50GHzfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/702/A140/tablea2Basic characteristics of the monitored sources in different bandsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (HHMM+DDd)meta.id;meta.maincharm(5GHz)? Intrinsic modulation index at 5GHz%src.var.indexfloatnullableSF'1.5(5GHz)? Structure function at a time lag of 1.5yr at 5GHz%src.var.indexfloatnullableSF'1.5/SF'3.0(5GHz)? Fastness of the flux density variations at 5GHzsrc.var.indexfloatnullablem(8GHz)Intrinsic modulation index at 8GHz%src.var.indexfloatSF'1.5(8GHz)Structure function at a time lag of 1.5yr at 8GHz%src.var.indexfloatSF'1.5/SF'3.0(8GHz)? Fastness of the flux density variations at 8GHzsrc.var.indexfloatnullablem(24GHz)Intrinsic modulation index at 24GHz%src.var.indexfloatSF'1.5(24GHz)Structure function at a time lag of 1.5yr at 24GHz%src.var.indexfloatSF'1.5/SF'3.0(24GHz)? Fastness of the flux density variations at 24GHzsrc.var.indexfloatnullablem(43GHz)? Intrinsic modulation index at 43GHz%src.var.indexfloatnullableSF'1.5(43GHz)? Structure function at a time lag of 1.5yr at 43 GHz%src.var.indexfloatnullableSF'1.5/SF'3.0(43GHz)? Fastness of the flux density variations at 43GHzsrc.var.indexfloatnullablealphaSpectral index between 8 and 24GHzspect.index;em.radio.12-30GHzfloatJ/A+A/702/A140/dataallFlux density measurments collected within the ROBIN programmerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharMJDModified Julian datedtime.epochdoubleindexedFreqObserved frequency (1)MHzem.freqintSFlux densityJyphot.flux.density;em.radiofloate_S1-sigma uncertainty on SJystat.errorfloat