J/AJ/130/2439ivo://CDS.VizieR/J/AJ/130/2439doi:10.26093/cds/vizier.51302439CDSSuchkov A.A.Hanisch R.J.Margon B.2006-10-13T16:48:31Z2006-10-13T16:41:49ZCDS support team

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

cds-question@unistra.frgalaxiescatalogsvisible-astronomysloan-photometryredshiftedWe have applied ClassX, an oblique decision tree classifier optimized for astronomical analysis, to the homogeneous multicolor imaging database of the Sloan Digital Sky Survey (SDSS), training the software on subsets of SDSS objects whose nature is precisely known via spectroscopy. We find that the software, using photometric data only, correctly classifies a very large fraction of the objects with existing SDSS spectra, both stellar and extragalactic. ClassX also accurately predicts the redshifts of both normal and active galaxies in SDSS. To illustrate ClassX applications in SDSS research, we (1) derive the object content of the SDSS Data Release 2 photometric catalog and (2) provide a sample catalog of resolved SDSS objects that contains a large number of candidate active galactic nucleus (AGN) galaxies (27,000), along with 63,000 candidate normal galaxies at magnitudes substantially fainter than the typical magnitudes of SDSS spectroscopic objects.2005AJ....130.2439Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/130/2439CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/259 : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005)http://www.sdss.org/dr2 : SDSS DR2 Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/130/2439https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/130/2439http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/130/2439https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/130/2439https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/130/2439http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/130/2439GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/130/2439/table5 (Catalog of 91847 Galaxies and Resolved AGN from SDSS DR2 Photometric Catalog classified with ClassX)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/130/2439/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/130/2439/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/130/2439/table5?GETtext/xml+votable180.050000true238.64369-1.011440.0055555555555555564/1599 1635 1636 1640 1684 1957 1958 5/136 137 138 4575 4595 4596 4597 4598 4601 4602 4603 4933 4934 4935 4937 4938 4939 4940 4944 5455 5459 5460 5464 5679 5762 5763 5764 5765 5768 6391 6395 6459 6463 6479 6483 6484 6485 6486 6488 6489 6490 6499 6500 6501 6502 6505 6506 6535 6539 6548 6549 6550 6552 6553 6554 6564 6565 6566 6568 6569 6570 6727 6735 6740 6741 6742 6744 6745 6746 6756 6757 6819 6824 7743 7786 7823 7844 7845 7846 7849 7850 7856 9181 9182 9183 9191 9195 9196 9197 9200 9201 9202 10239 11263 6/521 522 523 524 526 527 538 556 640 642 8192 8193 8194 17668 17669 18293 18294 18295 18299 18365 18366 18367 18375 18379 18396 18397 18398 18401 18402 18403 18416 18417 18418 19725 19726 19727 19729 19730 19731 19745 19746 19747 19764 19768 19780 19784 19844 21815 21831 21835 21844 21848 21860 21864 21905 21908 22711 22713 22714 22715 22760 22762 22763 23043 23045 23046 23047 23064 23065 23066 23068 23076 23077 23078 23080 23104 25559 25563 25575 25579 25835 25847 25848 25850 25851 25911 25915 25927 25931 25948 25949 25950 25964 25965 25966 25968 25969 25970 25991 26012 26013 26014 26017 26018 26019 26028 26029 26030 26032 26033 26034 26048 26049 26050 26135 26139 26151 26155 26204 26205 26206 26220 26221 26222 26224 26225 26226 26268 26269 26270 26284 26285 26286 26288 26289 26290 26304 26305 26306 26368 26369 26370 26903 26933 26935 26972 26973 26974 26988 26989 26990 26992 26993 26994 27032 27033 27035 27036 27037 27038 27072 27073 27074 27275 27300 27304 27648 27649 27650 30971 31138 31139 31148 31150 31287 31291 31309 31310 31311 31344 31345 31346 31348 31352 31371 31373 31374 31375 31388 31389 31390 31393 31394 31395 31404 31405 31406 31408 31409 31410 31428 31488 31489 31490 31496 36702 36703 36715 36717 36718 36719 36721 36722 36723 36759 36761 36762 36763 36773 36774 36775 36777 36779 36792 36793 36794 36796 36812 36813 36814 36816 36817 36818 36820 36832 40951 40955 45047 450512.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/130/2439?format=asciiOpticaldefaultJ/AJ/130/2439/table5Catalog of 91847 Galaxies and Resolved AGN from SDSS DR2 Photometric Catalog classified with ClassXzmagSDSS dereddened z band magnitudemagphot.mag;em.opt.IfloatzlowLower redshift limitsrc.redshift.photfloatzupUpper redshift limitsrc.redshift.photfloatTypeObject type assigned by the classifiersrc.classcharSDSSdataDisplay the SDSS data for this galaxymeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning number (1)meta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedumagSDSS dereddened u band magnitudemagphot.mag;em.opt.UfloatgmagSDSS dereddened g band magnitudemagphot.mag;em.opt.BfloatrmagSDSS dereddened r band magnitudemagphot.mag;em.opt.RfloatimagSDSS dereddened i band magnitudemagphot.mag;em.opt.Ifloat