J/A+A/584/A44ivo://CDS.VizieR/J/A+A/584/A44doi:10.26093/cds/vizier.35840044CDSCarrasco D.Barrientos L.F.Pichara K.Anguita T.Murphy D.N.A.,Gilbank D.G.Gladders M.D.Yee H.K.C.Hsieh B.C.Lopez S.2015-11-18T08:50:27Z2015-11-18T09:34:34ZCDS support team

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

cds-question@unistra.frquasarsvisible-astronomysloan-photometryultraviolet-photometryWe present new quasar candidate catalogs from the Red-Sequence Cluster Survey 2 (RCS-2), identified solely from photometric information using a Random Forest algorithm. The algorithm is trained using a well-defined SDSS spectroscopic sample of quasars and stars. The algorithm identifies putative quasars from broadband magnitudes (g, r, i, z) and colors. Exploiting NUV GALEX measurements for a subset of the objects, we refine the classifier by adding new information. An additional subset of the data with WISE W1 and W2 bands is also studied. Upon analyzing 542,897 RCS-2 point sources, the algorithm identified 21,501 quasar candidates, with a training-set-derived precision of 89.5% and recall of 88.4%. These performance metrics improve for the GALEX subset; 6530 quasar candidates are identified from 16898 sources, with a precision and recall respectively of 97.0% and 97.5%. Algorithm performance is further improved when WISE data are included, with precision and recall increasing to 99.3% and 99.1% respectively for 21834 quasar candidates from 242902 sources. After merging these samples and removing duplicates, we obtain 38257 candidates.2015A&A...584A..44Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/584/A44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)J/ApJS/158/161 : Photometric redshift catalog from the RCS (Hsieh+, 2005)J/ApJ/749/150 : Group galaxies in the RCS (Li+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/584/A44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/584/A44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/584/A44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/584/A44https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/584/A44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/584/A44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/584/A44/table3 (Quasar candidates from DS3)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/584/A44/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/584/A44/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/584/A44/table3?GETtext/xml+votable180.050000true7.5194553.54606690.005555555555555556Cone search capability for table J/A+A/584/A44/table1 (Quasar candidates from DS1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/584/A44/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/584/A44/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/584/A44/table1?GETtext/xml+votable180.050000true7.517164.70561890.005555555555555556Cone search capability for table J/A+A/584/A44/table2 (Quasar candidates from DS2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/584/A44/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/584/A44/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/584/A44/table2?GETtext/xml+votable180.050000true7.52613.26450.0055555555555555564/516 518 1187 1193 1196 1418 2289 2291 5/1511 1517-1519 1528 1530 1860-1862 2053 2055 2060-2061 2063 2070 2076 2365 2401-2403 2408 2410 2537-2539 2880 4279 4323 4326 4328-4329 4415 4493-4495 4498 4504-4505 4510 4516-4517 4519 4528 4533-4534 4536-4537 4544 4679 4685 4687-4688 4690-4691 4696-4698 4742-4743 4747 4760 4762-4763 4769 4771 4780-4781 4783 4788 4792 5667 5676 5678 5761 6378-6379 6533-6534 6558 6577 6677-6679 6720-6721 6723-6724 6726 6729-6731 9067 9070-9071 9152-9154 9168 9170 9176 6/6041-6043 6053 6055 6061 6064-6066 6090 7429 7431 7452 7488 8209 8211 8219 8249 8251 8272 8274 8284 8286-8287 8308 8341 8343 8384-8386 9435 9456-9457 9459 9468-9469 9471 9515 9518 9601-9603 9618-9619 9624-9626 9636-9638 9644 9648 9983 10123-10124 10126-10127 10147 10162 10168 10170 11524-11526 11529 11536 17111 17140-17141 17143 17191 17195 17197-17198 17202 17208 17281-17284 17286 17288 17290 17298-17299 17320-17321 17323-17326 17328-17330 17387 17629 17631 17651-17652 17654-17655 17657-17659 17800 17802-17803 17824-17825 17827 17830-17831 17833-17837 17839 17848 17850 17943 17949 17951 17959 17965 17967 17969-17971 17986 17998 18001 18004-18006 18029-18031 18046 18053 18055 18073 18100-18101 18103 18116-18118 18120 18122-18123 18126-18127 18131 18140 18152-18153 18156 18160 18180-18182 18185 18188 18192 18705-18707 18710-18713 18715 18737 18739 18745 18747 18756 18758-18759 18796 18798-18800 18802 18836-18837 18839 18880 18882 18884 18959 18963 18983 18987 19016 19018-19019 19044 19046-19047 19064 19066-19067 19073 19109 19129 19156 19158 19160 19162 19172-19174 19176-19178 22665 22667 22710 22716 22718 23040-23041 23043 23052-23053 23056-23058 25343 25510 25528 25530 25789-25791 25832 25834-25835 26125 26127 26130-26131 26160 26176 26223 26236 26238 26307 26316-26317 26320 26703 26736-26737 26739-26740 26742-26743 26748-26749 26751 26888-26889 26891 26902-26903 26908-26910 26915 26928-26930 26936 27008-27009 27011-27014 31421-31423 31464 31466-31467 31470-31471 36251 36263 36267 36273 36275-36276 36328 36330-36331 36341-36343 36348-36349 36351 36439 36445 36620-36622 36641 36644 36646 36676 36678 36685-36687 36696 36698 36708-36709 36712-36714 36753 36756-367573.830199579824256e-20 9.736485774071566e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/584/A44?format=asciiUVOpticaldefaultJ/A+A/584/A44/table3Quasar candidates from DS3recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal hours (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmagAB magnitude in the g band from RCS-2magphot.mag;em.opt.Bfloate_gmagPhotometric error in the g band from RCS-2magstat.error;phot.mag;em.opt.BfloatrmagAB magnitude in the r band from RCS-2magphot.mag;em.opt.Rfloate_rmagPhotometric error in the r band from RCS-2magstat.error;phot.mag;em.opt.RfloatimagAB magnitude in the i band from RCS-2magphot.mag;em.opt.Ifloate_imagPhotometric error in the i band from RCS-2magstat.error;phot.mag;em.opt.IfloatzmagAB magnitude in the z band from RCS-2magphot.mag;em.opt.Ifloate_zmagPhotometric error in the z band from RCS-2magstat.error;phot.mag;em.opt.IfloatW1magAB magnitude in the W1 band from WISEmagphot.mag;em.IR.3-4umfloate_W1magPhotometric error in the W1 band from WISEmagstat.error;phot.magfloatW2magAB magnitude in the W2 band from WISEmagphot.mag;em.IR.4-8umfloate_W2magPhotometric error in the W2 band from WISEmagstat.error;phot.magfloatDS1[0/1] Whether the object is classified as a quasar from DS1 (1: true)meta.codeintDS2[0/1] Whether the object is classified as a quasar from DS2 (1: true)meta.codeintallDisplay the data of this source in the 3 catalogs, if existmeta.ref.urlcharJ/A+A/584/A44/table1Quasar candidates from DS1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension in decimal hours (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maingmagAB magnitude in the g band from RCS-2magphot.mag;em.opt.Bfloate_gmagPhotometric error in the g band from RCS-2magstat.error;phot.mag;em.opt.BfloatrmagAB magnitude in the r band from RCS-2magphot.mag;em.opt.Rfloate_rmagPhotometric error in the r band from RCS-2magstat.error;phot.mag;em.opt.RfloatimagAB magnitude in the i band from RCS-2magphot.mag;em.opt.Ifloate_imagPhotometric error in the i band from RCS-2magstat.error;phot.mag;em.opt.IfloatzmagAB magnitude in the z band from RCS-2magphot.mag;em.opt.Ifloate_zmagPhotometric error in the z band from RCS-2magstat.error;phot.mag;em.opt.IfloatDS2[0/1] Whether the object is classified as a quasar from DS2 (1: true)meta.codeintDS3[0/1] Whether the object is classified as a quasar from DS3 (1: true)meta.codeintallDisplay the data of this source in the 3 catalogs, if existmeta.ref.urlcharJ/A+A/584/A44/table2Quasar candidates from DS2recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal hours (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainNUVAB magnitude in the NUV band from GALEXmagphot.mag;em.UVfloate_NUVPhotometric error in the NUV band from GALEXmagstat.errorfloatgmagAB magnitude in the g band from RCS-2magphot.mag;em.opt.Bfloate_gmagPhotometric error in the g band from RCS-2magstat.error;phot.mag;em.opt.BfloatrmagAB magnitude in the r band from RCS-2magphot.mag;em.opt.Rfloate_rmagPhotometric error in the r band from RCS-2magstat.error;phot.mag;em.opt.RfloatimagAB magnitude in the i band from RCS-2magphot.mag;em.opt.Ifloate_imagPhotometric error in the i band from RCS-2magstat.error;phot.mag;em.opt.IfloatzmagAB magnitude in the z band from RCS-2magphot.mag;em.opt.Ifloate_zmagPhotometric error in the z band from RCS-2magstat.error;phot.mag;em.opt.IfloatDS1[0/1] Whether the object is classified as a quasar from DS1 (1: true)meta.codeintDS3[0/1] Whether the object is classified as a quasar from DS3 (1: true)meta.codeintallDisplay the data of this source in the 3 catalogs, if existmeta.ref.urlchar