J/AZh/85/314ivo://CDS.VizieR/J/AZh/85/314CDSGorshkov A.G.Konnikova V.K.Mingaliev M.G.2017-10-11T05:12:56Z2008-08-09T16:53:08ZCDS support team

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

cds-question@unistra.frradio-sourcesWe present the results of twenty-year observations of a complete sample of 68 flat-spectrum radio sources with flux densities S3.9GHz>200mJy carried out at centimeter wavelengths with the RATAN-600 radio telescope. Since 1995, we have observed simultaneously at six frequencies between 0.97 and 21.7GHz. Of the 56 sources identified with optical objects, 41 are quasars with redshifts between 0.293 and 3.263. Based on our analysis of the spectral shapes, we divide the sources into four classes. Changes of spectral class for individual sources are fairly rare. Based on the light curves and spectra, in most cases,a flare's evolution is in accordance with a model in which the variations result from the evolution of a shock in the radio jet. The main result of our study is that there is no redshift dependence for the true linear sizes of the radiating regions, the variability indices derived for all 20 years of data or for individual flares, or the peak frequencies of the spectra of the compact radio emission. We suggest that this testifies to an absence of cosmological evolution of the sample quasars, at least to z~3.2008AZh....85..314Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AZh/85/314CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/60 : Interferometer phase calibration sources (Patnaik+ 1998)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AZh/85/314https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AZh/85/314http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AZh/85/314https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AZh/85/314https://vizier.iucaa.in/viz-bin/votable?-source=J/AZh/85/314http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AZh/85/314GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AZh/85/314/table1 (Coordinates, identifications, and variability amplitudes of the sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AZh/85/314/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AZh/85/314/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AZh/85/314/table1?GETtext/xml+votable180.050000true1.33423175.40300030.0055555555555555566/27 49 4122 8207 8220 12311 12323 12352 17791 17877 17898 18155 18158 18214 18242 18907 18926 19162 19166 19223 19483 19493 19500 19523 21886 21972 21987 21990 21997 22298 22305 23014 23015 23016 23257 23259 23261 23274 23323 23333 23335 23336 26073 26083 26089 26303 26340 26345 27096 27417 27433 27436 27675 27689 27712 30171 31190 31211 31439 31444 31451 31461 31508 31511 31523 31529 31770https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AZh/85/314?format=asciiRadiodefaultJ/AZh/85/314/table1Coordinates, identifications, and variability amplitudes of the sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_NameSimbad column added by the CDSmeta.ref.urlcharNameName (JHHMM+DDMM)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000) (1)pos.eq.raDEJ2000Declination (J2000) (1)pos.eq.decClClassification (G1)src.classcharz? Redshiftsrc.redshiftfloatnullabler_z? Reference for redshift (3)meta.ref;pos.frameintnullableBmag? B magnitude (2)magphot.mag;em.opt.BfloatnullableV3.9? Variability index at 3.9GHz (4)src.var.indexfloatnullableV3.9c? Variability index at 3.9GHz after subtracting the extended component (4)src.var.indexfloatnullableV7.7? Variability index at 7.7GHz (4)src.var.indexfloatnullableV7.7c? Variability index at 7.7GHz after subtracting the extended component (4)src.var.indexfloatnullableSp[1/4] Spectrum class (5)meta.code.classintSimbadNameSimbad column added by the CDSmeta.idchar_RAComputed Right Ascension for Equinox: J2000degpos.eq.ra;meta.main_DEComputed Declination for Equinox: J2000degpos.eq.dec;meta.mainJ/AZh/85/314/table2Parameters of sources derived from the long-term flux-density variationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharn_Name[*] * when no intermediate observations between the minimum and the level assumed to be the flare maximummeta.notecharClClassification (G1)src.classcharz? Redshiftsrc.redshiftfloatnullableVf7.7-GHz flare variability indexmeta.code;meta.code.multipfloatDSFlare amplitude (DS=Smax-Smin)mJysrc.var.amplitudeinttauFlare timescaleyrtime.intervalfloatR? Apparent linear sizepcphys.angSize;srcfloatnullabletheta? Apparent angular sizemasphys.angSize;srcfloatnullableTb? Brightness temperature in the source rest frame1e+12Kphys.temperaturefloatnullableDvar? Corresponding Doppler factor, Dvar=(T^0^_b_/10^12^)^1/3^spect.dopplerParamfloatnullable