J/AJ/151/54ivo://CDS.VizieR/J/AJ/151/54doi:10.26093/cds/vizier.51510054CDSSandrinelli A.Covino S.Dotti M.Treves A.2017-06-22T14:29:27Z2016-07-13T09:59:01ZCDS support team

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

cds-question@unistra.frquasarsinfrared-photometryvisible-astronomyphotometryWe searched for quasi-periodicities on year-like timescales in the light curves of six blazars in the optical--near-infrared bands and we made a comparison with the high energy emission. We obtained optical/NIR light curves from Rapid Eye Mounting photometry plus archival Small & Moderate Aperture Research Telescope System data and we accessed the Fermi light curves for the {gamma}-ray data. The periodograms often show strong peaks in the optical and {gamma}-ray bands, which in some cases may be inter-related. The significance of the revealed peaks is then discussed, taking into account that the noise is frequency dependent. Quasi-periodicities on a year-like timescale appear to occur often in blazars. No straightforward model describing these possible periodicities is yet available, but some plausible interpretations for the physical mechanisms causing periodic variabilities of these sources are examined.2016AJ....151...54Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/151/54CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)J/A+A/562/A79 : Variability of seven blazars in six bands (Sandrinelli+, 2014)J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)J/AJ/133/2866 : 2001-02 optical variability of blazar 3C279 (Kartaltepe+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/151/54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/151/54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/151/54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/151/54https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/151/54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/151/54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/151/54/table1 (Blazar sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/151/54/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/151/54/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/151/54/table1?GETtext/xml+votable180.050000true84.70833-44.085830.0055555555555555566/4695 26131 34123 44908 47014 47375https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/151/54?format=asciiInfraredOpticaldefaultJ/AJ/151/54/table1Blazar samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the blazarmeta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainClassClass from Massaro et al. 2015 (cat. VII/274) (BL Lac or FSRQ=Flat Spectrum Radio Quasar)src.classcharBZCATDisplay the data from the 5th edition of the Roma BZCAT (Massaro et al. 2015, cat. VII/274) within 13"meta.ref.urlcharSEDSED classification (2)src.spTypecharz[0.07/0.9] Redshift (1)src.redshiftfloatSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlcharJ/AJ/151/54/table2Rapid Eye Mounting telescope (REM) photometry of 3C 279recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFlt[VRIJHK] Filter used in the observation (V, R, I, J, H, or K)instr.setup;obscharMJD[53462/55742] Modified Julian Date of the observationdtime.epochint<mag>[9.5/16.9] Average magnitude in Filtermagphot.magfloate_<mag>[0/1] Error in <mag>magstat.error;phot.magfloat