J/ApJS/224/18ivo://CDS.VizieR/J/ApJS/224/18doi:10.26093/cds/vizier.22240018CDSProctor D.D.2017-01-23T22:00:00Z2016-08-02T14:48:38ZCDS support team

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

cds-question@unistra.frradio-galaxiesactive-galactic-nucleiResults of the application of pattern-recognition techniques to the problem of identifying giant radio sources (GRSs) from the data in the NVSS catalog are presented, and issues affecting the process are explored. Decision-tree pattern-recognition software was applied to training-set source pairs developed from known NVSS large-angular-size radio galaxies. The full training set consisted of 51195 source pairs, 48 of which were known GRSs for which each lobe was primarily represented by a single catalog component. The source pairs had a maximum separation of 20' and a minimum component area of 1.87arcmin^2^ at the 1.4mJy level. The importance of comparing the resulting probability distributions of the training and application sets for cases of unknown class ratio is demonstrated. The probability of correctly ranking a randomly selected (GRS, non-GRS) pair from the best of the tested classifiers was determined to be 97.8+/-1.5%. The best classifiers were applied to the over 870000 candidate pairs from the entire catalog. Images of higher-ranked sources were visually screened, and a table of over 1600 candidates, including morphological annotation, is presented. These systems include doubles and triples, wide-angle tail and narrow-angle tail, S- or Z-shaped systems, and core-jets and resolved cores. While some resolved-lobe systems are recovered with this technique, generally it is expected that such systems would require a different approach.2016ApJS..224...18Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/224/18CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/272 : A catalogue of Galactic supernova remnants (Green, 2014)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/ApJS/194/31 : Morphology for groups in the FIRST database (Proctor, 2011)J/AJ/130/156 : Galactic radio compact HII regions at 1.4GHz (Giveon+, 2005)J/A+A/370/409 : New sample of large angular size radio gal. I. (Lara+, 2001)J/ApJS/126/133 : The FIRST bright quasar survey. II. (White+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/224/18https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/224/18http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/224/18https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/224/18https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/224/18http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/224/18GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/224/18/table6 (Giant radio sources and candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/224/18/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/224/18/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/224/18/table6?GETtext/xml+votable180.050000true0.17887512.26177780.0055555555555555566/6 11 18 50 90 141 145 207 215 246 322 341 370 398 425 429 435 447 462 519 551 558 595 651 737 747 762 767 813 841 880 921 946 1005 1008 1018 1030 1039 1052 1069 1106 1117 1160 1205 1208 1214 1226 1263 1369 1373 1393 1436 1466 1546 1556 1561 1567 1627 1635 1668 1671 1680 1690 1700 1701 1708 1714 1746 1756 1763 1786 1797 1825 1852 1999 2005 2028 2038 2066 2085 2089 2157 2176 2179 2186 2190 2208 2214 2227 2232 2313 2331 2375 2396 2407 2414 2431 2450 2461 2466 2471 2525 2611 2622 2653 2658 2670 2672 2709 2811 2813 2818 2831 2836 2843 2859 2866 2872 2883 2935 2963 3014 3023 3072 3073 3105 3147 3163 3175 3193 3233 3240 3299 3309 3431 3462 3502 3536 3710 3716 3803 3901 4022 4115 4146 4156 4175 4198 4267 4271 4294 4313 4327 4349 4373 4399 4419 4426 4451 4522 4586 4597 4613 4685 4688 4704 4705 4731 4745 4747 4776 4797 4822 4865 4928 4930 4954 4970 4978 5005 5018 5023 5046 5048 5075 5132 5142 5180 5185 5258 5297 5311 5365 5406 5438 5449 5454 5457 5507 5517 5518 5525 5616 5618 5679 5714 5731 5773 5785 5905 5906 5930 5975 5995 6007 6044 6045 6067 6107 6180 6213 6281 6320 6332 6348 6392 6398 6459 6469 6470 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34535 34545 34558 34578 34653 34685 34694 34710 34723 34760 34778 34779 34782 34785 34804 35189 35323 35512 35515 35516 35563 35591 35608 35619 35663 35711 35758 35817 35859 35875 35889 35963 35981 35984 35993 36000 36013 36017 36044 36066 36100 36116 36238 36247 36307 36374 36389 36435 36436 36450 36452 36470 36472 36537 36560 36564 36570 36580 36592 36686 36689 36816 36840 36844 38255 38260 38318 38322 38348 38359 38361 38376 38390 38525 38527 38558 38585 38596 38609 38644 38655 38658 38687 38701 38737 38791 38862 38864 39325 39353 39362 39393 39539 39542 39546 39658 39670 39692 39693 39707 39715 39719 39722 39724 39729 39733 39798 39799 39898 39931 39955 39961 39982 39983 40023 40081 40083 40105 40119 40154 40177 40199 40268 40297 40310 40332 40374 40383 40391 40412 40433 40436 40445 40457 40475 40509 40518 40525 40527 40534 40535 40550 40559 40561 40667 40674 40700 40726 40757 40803 40809 40824 40844 40857 40872 40912 40950 42463 42469 42682 42683 42702 42720 42729 42743 42820 42872 42882 42910 42960 42979 43358 43359 43471 43508 43693 43759 43778 43806 43871 43881 43883 43913 43919 43938 43950 43974 43977 43988 43991 44057 44106 44138 44144 44180 44200 44228 44243 44247 44253 44261 44262 44284 44296 44297 44302 44335 44338 44340 44343 44352 44362 44391 44405 44454 44467 44572 44623 44647 44649 44670 44710 44729 44731 44741 44782 44845 44900 44928 44969 44975 45006 45008 45020 46450 46540 46581 46767 46772 46797 46851 46912 46941 46991 47003 47040 47084 47101 47541 47543 47613 47615 47845 47873 47875 47881 47894 47899 47928 47929 47932 47957 47975 48032 48043 48064 48085 48098 48105 48106 48115 48170 48171 48189 48275 48282 48284 48311 48323 48335 48341 48344 48381 48390 48392 48447 48487 48501 48514 48519 48524 48541 48585 48594 48613 48614 48694 48725 48750 48788 48830 48901 48924 48926 48945 49065 49078 49150https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/224/18?format=asciiRadiodefaultJ/ApJS/224/18/table6Giant radio sources and candidatesNVSSDisplay data from NVSS (VIII/65) within 0.1"meta.ref.urlintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning sequence numbermeta.idintNVGRCIAU Name (JHHMMSS.s+DDMMSS) (1)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainFlag[cv] System coordinate code (2)meta.code.errorcharDiam[3/105] System diameter, 1.4MJy level (3)arcminphys.angSize;phys.atmol.levelfloatNotesAnnotations (4)meta.notecharRIDOther identifier(s) (5)meta.idchar