J/MNRAS/428/226ivo://CDS.VizieR/J/MNRAS/428/226doi:10.26093/cds/vizier.74280226CDSPolsterer K.L.Zinn P.-C.Gieseke F.2024-07-20T20:13:21Z2014-02-06T09:50:57ZCDS support team

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

cds-question@unistra.frquasarsredshiftedQuasars with a high redshift (z) are important to understand the evolution processes of galaxies in the early Universe. However, only a few of these distant objects are known to this date. The costs of building and operating a 10-m class telescope limit the number of facilities and, thus, the available observation time. Therefore, an efficient selection of candidates is mandatory. This paper presents a new approach to select quasar candidates with high redshift (z>4.8) based on photometric catalogues. We have chosen to use the z>4.8 limit for our approach because the dominant Lyman {alpha} emission line of a quasar can only be found in the Sloan i- and z-band filters. As part of the candidate selection approach, a photometric redshift estimator is presented, too. Three of the 120000 generated candidates have been spectroscopically analysed in follow-up observations and a new z=5.0 quasar was found. This result is consistent with the estimated detection ratio of about 50% and we expect 60000 high-redshift quasars to be part of our candidate sample. The created candidates are available for download at MNRAS or at http://www.astro.rub.de/polsterer/quasar-candidates.csv.2013MNRAS.428..226Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/428/226CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)http://www.sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/428/226https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/428/226http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/428/226https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/428/226https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/428/226http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/428/226GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/428/226/qsocand (Quasar candidate data from SDSS photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/428/226/qsocand?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/428/226/qsocand?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/428/226/qsocand?GETtext/xml+votable180.050000true248.204041722.30188280.0055555555555555562/16 22 25 32-33 36 38 3/68 70-73 75-76 78-79 81-83 92-94 97 112-114 116 136-138 140-142 148 150 162-164 167 169-170 173-178 184 407 411-412 423 427 429-431 433-436 438 440 491 494 4/277-279 296-297 299 309-311 321-323 336-337 339 341-343 345-349 351 381-383 385 387 397 399 460-462 468-469 472 556-558 572-573 575 624 626 631-632 634 637 641-645 647 660-662 665-667 674 685-689 691 716 718 720 722 740 744-746 1367 1372-1373 1375 1397 1399 1599 1621-1623 1625-1627 1637-1639 1641-1643 1652-1653 1655-1656 1658-1662 1685-1687 1690-1691 1701-1702 1705 1707 1712-1713 1715 1728 1730-1731 1748 1757 1759 1764-1765 1767 1773-1775 1777 1779-1782 1784-1786 1789-1791 1961-1963 1980 1982-1983 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25565-25567 25581-25583 25821-25823 25831 25835 25837-25839 25841-25843 25885 25887 25901-25903 25905-25907 25922-25923 25985-25987 26141-26143 26157-26159 26161-26163 26177-26179 26241-26243 26464 26466-26467 26512-26513 26515 26517-26519 26613-26615 26845-26847 26861-26863 26865-26867 26909-26911 26933 26942-26943 26945-26947 27009-27011 27025-27027 27165-27167 27181 27183 27185-27187 27201-27203 27260 27262-27263 27267 27273 27297-27299 27424 27426-27427 27673-27675 27984-27985 27987 27992-27994 28008-28009 28011 28028-28030 28108 28110-28111 28133-28135 28256 28258-28259 28265 28267 28296-28298 28308 28310-28311 28328-28329 28331 28333-28335 28340 28342-28343 28352 28354-28355 28428-28429 28431 28453-28455 28540 28542-28543 28593-28595 28612-28614 28620-28621 28623 29973 30016 30029-30031 30033-30035 30053 30064-30066 30068 30971 30973-30975 31138-31139 31148 31150 31279 31283 31285-31287 31309-31311 31313-31315 31324-31326 31329-31331 31344-31346 31349-31351 31363 31488-31490 31520 31522-31523 31525-31527 31536 31538-31539 31542-31543 31586-31587 31590 31614 31700 31702 31708 31710 32299 32302-32303 32314-32315 32385 32387 32393 32395 32454-32455 32467 32470-32471 32642 32648 32650 32655 32694 32700 32702-32703 36607 36702-36703 36715 36717-36719 36721-36723 36732-36734 36759 36761 36763 36773-36775 36792-36794 36812 36816-36818 36832 36861-36863 40957-40959 45022-45023 45039 45043 48983 48987 49005 49007 49009-49011 49020-49022 49055 49077-49079 49081 49091 49112 49124-49126 49128-491302.040811542443644e-19 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/428/226?format=asciiOpticaldefaultJ/MNRAS/428/226/qsocandQuasar candidate data from SDSS photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS objID numbermeta.id;meta.mainRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedz[2.5/6.2] Redshift photometric estimatesrc.redshiftfloate_zStandard deviation in redshiftstat.error;src.redshiftfloatClass[0.83/1] Coarse classifier rate (separates quasars, galaxies and stars)meta.codefloatRej*[0/.471] Cool star rejection rate (separates cool stars and quasars)meta.codefloatDist[0.63/1] Modified distance rate (separates quasars, galaxies and stars)meta.codefloatumagpsf SDSS u magnitudemagphot.mag;em.opt.Ufloatgmagpsf SDSS g magnitudemagphot.mag;em.opt.Bfloatrmagpsf SDSS r magnitudemagphot.mag;em.opt.Rfloatimagpsf SDSS i magnitudemagphot.mag;em.opt.Ifloatzmagpsf SDSS z magnitudemagphot.mag;em.opt.IfloatSloanDisplay the SDSS data for this objectmeta.ref.urlchar