J/A+A/650/A83ivo://CDS.VizieR/J/A+A/650/A83doi:10.26093/cds/vizier.36500083CDSHovatta T.Lindfors E.Kiehlmann S.Max-Moerbeck W.Hodges M,Liodakis I.Lahteenmaki A.Pearson T.J.Readhead A.C.S.Reeves R.A.,Suutarinen S.Tammi J.Tornikoski M.2021-09-29T08:57:25Z2021-06-10T08:24:03ZCDS support team

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

cds-question@unistra.frradio-continuum-emissionbl-lacertae-objectsquasarsIdentifying the most likely sources for high-energy neutrino emission has been one of the main topics in high-energy astrophysics ever since the first observation of high-energy neutrinos by the IceCube Neutrino Observatory. Active galactic nuclei with relativistic jets, also known as blazars, have been considered to be one of the main candidates because of their ability to accelerate particles to high energies. We study the connection between radio emission and IceCube neutrino events using data from the Owens Valley Radio Observatory (OVRO) and Metsahovi Radio Observatory blazar monitoring programs. We identify sources in our radio monitoring sample that are positionally consistent with IceCube high-energy neutrino events. We estimate their mean flux density and variability amplitudes around the neutrino arrival time, and compare these with values from random samples to establish the significance of our results. We find radio source associations within our samples with 15 high-energy neutrino events detected by IceCube. Nearly half of the associated sources are not detected in the {gamma}-ray energies, but their radio variability properties and Doppler boosting factors are similar to the {gamma}-ray detected objects in our sample, meaning that they could still be potential neutrino emitters. We find that the number of strongly flaring objects in our statistically complete OVRO samples is unlikely to be a random coincidence (at 2{sigma} level). Based on our results, we conclude that although it is clear that not all neutrino events are associated with strong radio flaring blazars, observations of large-amplitude radio flares in a blazar at the same time as a neutrino event are unlikely to be a random coincidence.2021A&A...650A..83Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/650/A83CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/650/A83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/650/A83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/650/A83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/650/A83https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/650/A83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/650/A83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/650/A83/sources (List of studied sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/650/A83/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/650/A83/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/650/A83/sources?GETtext/xml+votable180.050000true32.804916710.85966670.0055555555555555566/514 1546 1550 8299 10422 19066 19166 19189-19190 19253 19367 19373 20969 20974 23015 24099 26131 28383 29675 29730https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/650/A83?format=asciiRadiodefaultJ/A+A/650/A83/sourcesList of studied sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameJ2000 Name of the target (JHHMM+DDMM)meta.id;meta.maincharRAJ2000Simbad Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000.0)pos.eq.dec;meta.mainLC15Show the 15GHz light curvemeta.ref.urlcharN15GHz? Number of 15GHz flux density measurements in fluxdens.dat filemeta.numberintnullableLC37Show the 37GHz light curvemeta.ref.urlcharN37GHz? Number of 37GHz flux density measurements in fluxdens.dat filemeta.numberintnullableSNameSimbad namemeta.idcharJ/A+A/650/A83/fluxdensFlux densities at 15 and 37GHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameJ2000 Name of the target (JHHMM+DDMM)meta.id;meta.maincharONameAlias of the namemeta.idcharFreq[15/37] Frequency of the observationGHzem.freq;obsintMJDModified Julian date of the observationdtime.epochdoubleindexedSFlux densityJyphot.flux.densityfloate_S1-sigma uncertainty of the flux densityJystat.errorfloatTelInstrument used for observationinstr.setupchar