J/A+A/482/483ivo://CDS.VizieR/J/A+A/482/483doi:10.26093/cds/vizier.34820483CDSTorniainen I.Tornikoski M.Turunen M.Lainela M.Lahteenmaki A.,Hovatta T.Mingaliev M.G.Aller M.F.Aller H.D.2017-12-18T07:57:16Z2008-06-19T08:44:19ZCDS support team

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

cds-question@unistra.frquasarsradio-sourcesphotometrypolarimetryGigahertz-peaked spectrum (GPS) sources and high frequency peakers (HFPs) are among the smallest of active galactic nuclei currently believed to represent the earliest phases in the evolution of extragalactic radio sources. Recently there has been evidence of contamination by other types of radio sources among the GPS and HFP samples, but the confirmed GPS sources or HFPs also seem to form a very heterogeneous population. We study the statistical clustering of the GPS sources and the HFPs by taking as many source parameters as possible to find homogeneous groups among the sources. We expect the clustering to give us insight into the physical parameters that play a role in different source populations. We have collected a sample of 206 GPS sources and HFPs from the literature and gathered a massive database of various source properties, such as the redshift, the size, the polarization, the magnitudes, and the properties of the radio continuum. To visualize and to cluster these multidimensional data we used self-organising maps (SOM), which are neural networks trained by an unsupervised algorithm. We have classified the sources with an auxiliary classification to trace the locations of different types of radio continuum spectra on the map.2008A&A...482..483Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/482/483CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/482/483https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/482/483http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/482/483https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/482/483https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/482/483http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/482/483GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/482/483/table (Data for each source)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/482/483/table?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/482/483/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/482/483/table?GETtext/xml+votable180.050000true0.8304221.495830.0055555555555555566/64 392 465 696 1025 1154 1225 1576 2089 2207 2331 2397 2600 2631 3820 3918 3971 4070 4114 4216 4310 5479 5630 5767 5867 5974 6067 6252 6377 6381 6751 6755 6815 6853 6944 6946 7119 7129 7195 7857 8057 8106 8199 8220 8252 8345 8365 8718 8912 9347 9394 9403 9720 10321 10440 10654 10795 11024 11126 11594 11669 11686 11774 11806 12173 12209 12301 12338 12352 12580 12611 12896 13153 13287 13352 13585 13789 14874 14879 14905 15147 15936 16220 16247 16253 16281 16298 17048 17341 17542 17579 17857 17892 18096 18271 18592 18718 18871 18907 19060 19085 19101 19166 19177 19367 19410 19483 19537 19918 20228 20358 21012 21121 21497 21713 21924 22364 22375 22619 22774 22943 22965 23720 24084 24123 24571 24809 24936 25093 25239 25302 25354 25630 25920 26044 26483 26491 26898 26981 27035 27138 27433 27464 27672 28162 28184 28341 28643 29714 29963 30171 31161 31235 31248 31332 31423-31424 31529 31666 31696 31894 31909 32160 32247 32362 32571 32582 32764 34038 34123 34419 34461 34591 34727 34739 35482 35670 36408 36417 36423 36785 36941 38778 40131 42920 43399 43876 44078 44147 44361 44534 44681 44724 44907 45763 46174 46964 47540 47941 48493 48542 48610 48724 48846 48965https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/482/483?format=asciiOpticalRadiodefaultJ/A+A/482/483/tableData for each sourceIDOptical ID (1)meta.idchar_RAComputed Right Ascension for Equinox: J2000degpos.eq.ra;meta.main_DEComputed Declination for Equinox: J2000degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSRCSource name (HHMM+DDd/d)meta.id;meta.maincharr_IDReference for optical IDmeta.ref;pos.framecharu_ID[)] Uncertainty flag on r_IDmeta.code.errorcharOClassOriginal classification, as GPS or HFP (High- Frequency Peaker)meta.code.classcharr_OClassReference for original classificationmeta.ref;pos.framecharClassAuxiliary classification (3)meta.code.classcharz? Redshiftsrc.redshiftfloatnullabler_zReference for redshiftmeta.ref;pos.framecharf_z[*] * for photometric redshiftmeta.codecharSzkpc? Size of the sourcekpcphys.angSizefloatnullabler_SzkpcReference for sizemeta.ref;pos.framecharf_Szkpc[*] * for recalculated size (2)meta.codecharP5GHz? log(10) of source power at 5GHz (5)log(W.Hz**-1)phys.luminosity;em.radio.3-6GHzfloatnullabler_P5GHz[calc] Reference for P5GHzmeta.ref;pos.framecharpolOpt? Optical polarization%phys.polarization;em.optfloatnullabler_polOptReference for optical polarizationmeta.ref;pos.framecharpolRad? Radio polarization%phys.polarizationfloatnullabler_polRadReference for radio polarizationmeta.ref;pos.framecharf_polRad[*] * for zuk99 and step95 referencemeta.codecharn_polRadNote on polRadmeta.notecharBmag? B magnitudemagphot.mag;em.opt.Bfloatnullabler_BmagReference for B magnitudemeta.ref;pos.framecharVmag? V magnitudemagphot.mag;em.opt.Vfloatnullabler_VmagReference for V magnitudemeta.ref;pos.framecharRmag? R magnitudemagphot.mag;em.opt.Rfloatnullabler_RmagReference for R magnitudemeta.ref;pos.framecharf_Rmag[*] * when calculated from r magnitudemeta.codecharImag? I magnitudemagphot.mag;em.opt.Ifloatnullabler_ImagReference for I magnitudemeta.ref;pos.framecharf_Imag[*] * when calculated from i magnitudemeta.codecharV-R? V-R colour indexmagphot.color;em.opt.V;em.opt.Rfloatnullabler_V-RReference for V-R colourmeta.ref;phot.color;em.opt.VcharB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullabler_B-VReference for B-V colourmeta.ref;phot.color;em.opt.BcharU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullabler_U-B[vv03] Reference for U-B colourmeta.ref;phot.color;em.opt.UcharR-I? R-I colour indexmagphot.color;em.opt.R;em.opt.Ifloatnullabler_R-IReference for R-I colourmeta.ref;phot.color;em.opt.RcharFreq? Rest-frame frequency of the turnover of the spectrumGHzmeta.notefloatnullableab? Spectral index below the turnoverspect.indexfloatnullableaa? Spectral index above the turnoverspect.indexfloatnullablesymm? Symmetry of the spectrummeta.notefloatnullablecurv? Curvature of the spectrummeta.notefloatnullableFWHM? Full width at half maximum of the spectrumspect.line.widthfloatnullableMid? Mid-frequency of the bin used in calculationsinstr.setupfloatnullableVI? Variability indexmeta.code;src.var.indexfloatnullableo_VI? Number of data points used for VImeta.numberintnullableNHX? Hydrogen column density in X-rays1e+22cm**-2phys.columnDensityfloatnullabler_NHXReference for N_H_Xmeta.ref;pos.framecharGamma? Power-law slope in X-raysspect.indexfloatnullabler_GammaReference for power-law slope in X-raysmeta.ref;pos.framecharNH21? Neutral hydrogen column density1e+20cm**-2phys.columnDensityfloatnullabler_NH21Reference for NH21meta.ref;pos.framecharEmag? E (photographic red) magnitudemagphot.mag;em.opt.Rfloatnullabler_Emagreference for E magnitudemeta.refcharOmag? O (photographic blue) magnitudemagphot.mag;em.opt.Bfloatnullabler_OmagReference for O magnitudemeta.refcharO-E? O-E colour indexmagphot.color;em.opt.B;em.opt.Rfloatnullabler_O-EReference for O-E colourmeta.ref;pos.framecharMorphVLBI morphology (4)meta.code;src.morphcharr_MorphReference for VLBI morphologymeta.ref;pos.framecharSimbadNameSimbad column added by the CDSmeta.idcharSPECFINDDisplay the radio data from SPECFIND (Cat. VIII/74)meta.ref.urlcharJ/A+A/482/483/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar