J/AJ/144/49ivo://CDS.VizieR/J/AJ/144/49doi:10.26093/cds/vizier.51440049CDSWu X.-B.Hao G.Jia Z.Zhang Y.Peng N.2017-02-15T14:05:12Z2013-10-11T07:26:17ZCDS support team

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

cds-question@unistra.frsurveysquasarsvisible-astronomysloan-photometryredshiftedextinctioninfrared-photometryWe present a catalog of 37842 quasars in the Sloan Digital Sky Survey (SDSS) Data Release 7, which have counterparts within 6" in the Wide-field Infrared Survey Explorer (WISE) Preliminary Data Release. The overall WISE detection rate of the SDSS quasars is 86.7%, and it decreases to less than 50.0% when the quasar magnitude is fainter than i=20.5. We derive the median color-redshift relations based on this SDSS-WISE quasar sample and apply them to estimate the photometric redshifts of the SDSS-WISE quasars. We find that by adding the WISE W1- and W2-band data to the SDSS photometry we can increase the photometric redshift reliability, defined as the percentage of sources with photometric and spectroscopic redshift difference less than 0.2, from 70.3% to 77.2%. We also obtain the samples of WISE-detected normal and late-type stars with SDSS spectroscopy, and present a criterion in the z-W1 versus g-z color-color diagram, z-W1>0.66(g-z)+2.01, to separate quasars from stars. With this criterion we can recover 98.6% of 3089 radio-detected SDSS-WISE quasars with redshifts less than four and overcome the difficulty in selecting quasars with redshifts between 2.2 and 3 from SDSS photometric data alone. We also suggest another criterion involving the WISE color only, W1-W2>0.57, to efficiently separate quasars with redshifts less than 3.2 from stars. In addition, we compile a catalog of 5614 SDSS quasars detected by both WISE and UKIDSS surveys and present their color-redshift relations in the optical and infrared bands. By using the SDSS ugriz, UKIDSS, YJHK, and WISE W1- and W2-band photometric data, we can efficiently select quasar candidates and increase the photometric redshift reliability up to 87.0%. We discuss the implications of our results on the future quasar surveys. An updated SDSS-WISE quasar catalog consisting of 101853 quasars with the recently released WISE all-sky data is also provided.2012AJ....144...49Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/49CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012)V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/311 : WISE All-Sky Data Release (Cutri+ 2012)J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012)J/AJ/142/78 : New 2.2<z<3 quasars from SDSS and UKIDSS (Wu+, 2011)J/MNRAS/406/1583 : Quasar from SDSS and UKIDSS (Wu+, 2010)J/MNRAS/386/1605 : Luminous K-band selected QSOs from UKIDSS (Maddox+, 2008)J/ApJ/667/673 : FIRST-2MASS red quasar survey (Glikman+, 2007)J/AJ/121/2843 : QSOs in 2MASS II incremental data release (Barkhouse+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/49https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/144/49/table1 (A catalog of 37842 SDSS-WISE quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/49/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/49/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/49/table1?GETtext/xml+votable180.050000true18.9848330631.799980.005555555555555556Cone search capability for table J/AJ/144/49/table3 (A catalog of 5614 SDSS-UKIDSS-WISE quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/49/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/49/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/49/table3?GETtext/xml+votable180.050000true25.9946588914.706348890.005555555555555556Cone search capability for table J/AJ/144/49/table5 (A catalog of 101853 SDSS-WISE quasars by matching the WISE all-sky data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/49/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/49/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/49/table5?GETtext/xml+votable180.050000true0.03390.276301110.0055555555555555561/8 10 27 2/16 17 19 20 21 22 25 28 38 103 107 3/72 73 75 92 94 95 97 116 144 147 176 177 178 184 407 411 423 427 491 494 4/296 297 299 373 374 375 399 468 469 472 580 582 583 585 586 587 592 594 600 602 624 716 718 740 744 745 746 1375 1621 1622 1623 1625 1626 1627 1637 1638 1639 1641 1642 1643 1685 1687 1691 1703 1707 1961 1962 1963 1980 1982 1983 2027 5/7 12 136 138 178 425 518 523 574 1192 1193 1195 1488 1489 1490 1540 1541 1549 1585 1588 1589 1685 1728 1732 1790 1791 1880 1881 1882 1896 1897 1900 1901 2041 2325 2327 2336 2337 2338 2504 2506 2518 2521 2523 2524 2526 2528 2530 2536 2545 2547 2548 2550 2553 2555 2868 2870 2876 2878 2893 2897 2898 2899 2968 2970 2988 3095 3097 3098 3099 3100 3137 3138 3140 3332 3749 4303 4307 4308 4309 4310 4312 4313 4314 4323 4324 4325 4326 4329 4330 4351 4373 4374 4375 4377 4378 4379 4380 4387 4389 4390 4393 4394 4416 4437 4438 4441 4442 4444 4452 4453 4454 4457 4458 4476 4501 4502 4505 4506 4516 4517 4518 4521 4522 4523 4544 4558 4575 4596 4597 4598 4601 4602 4629 4630 4633 4634 4635 4636 4645 4647 4651 4652 4656 4687 4693 4694 4696 4697 4698 4709 4710 4713 4714 4736 4737 4738 4757 4758 4761 4762 4773 4774 4777 4778 4780 4817 4831 4845 4846 4847 4851 4852 4853 4854 4856 4899 4917 4918 4919 4921 4922 4923 4924 4933 4934 4935 4937 4938 4939 4940 4960 4985 4997 4998 5000 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24053 24057 24060 24061 24237 24251 25247 25289 25291 25312 25313 25316 25331 25332 25335 25340 25517 25519 25528 25530 25531 25565 25566 25567 25581 25582 25583 25585 25586 25587 25771 25821 25822 25823 25837 25838 25839 25841 25842 25843 25885 25887 25901 25902 25903 25905 25907 25923 25985 25986 25987 26112 26113 26115 26116 26118 26120 26121 26141 26142 26143 26157 26158 26159 26161 26162 26163 26168 26169 26170 26177 26178 26179 26241 26242 26243 26877 26878 26879 26909 26910 26911 26933 26941 26942 26943 26945 26946 26947 26985 26986 26987 27021 27022 27023 27025 27026 27027 27041 27042 27043 27197 27198 27199 27213 27214 27215 27217 27218 27219 27233 27234 27235 27277 27278 27279 27281 27282 27283 27297 27299 29777 29973 30029 30030 30031 30033 30034 30035 30044 30045 30046 30053 30064 30065 30066 30068 30973 30974 30975 31138 31139 31150 31289 31290 31291 31309 31310 31311 31313 31314 31315 31324 31325 31326 31329 31330 31331 31340 31341 31342 31344 31345 31346 31353 31354 31355 31357 31358 31359 31369 31370 31371 31488 31489 31490 31522 31550 31551 31594 31598 31599 31607 31611 31612 31614 31700 31710 31880 31881 31886 31905 31908 32180 32391 32397 32398 32399 32402 32403 32406 32407 32425 32426 32427 32460 32462 32478 32479 32484 32486 32492 32494 32495 32497 32499 32505 32519 32530 32537 32553 32555 32556 32558 32641 32650 32672 32674 32684 32686 32696 32697 32700 32702 36607 36703 36715 36721 36722 36723 36759 36761 36762 36763 36792 36793 36794 36796 36812 36816 36817 36818 36832 36861 36862 36863 40959 45023 45039 45043 48894 48983 48987 49005 49007 49020 49021 49022 49077 49078 49079 49091 49108 49112 49124 49126 49128 49129 49130 49149 49150 491519.932213363424795e-25 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/144/49?format=asciiOpticalInfrareddefaultJ/AJ/144/49/table1A catalog of 37842 SDSS-WISE quasarsz[0.06/5.47] Redshiftsrc.redshiftfloate_imag? Error in imagmagstat.error;phot.mag;em.opt.IfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000SDSS Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000SDSS Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedOff[0/6] SDSS-WISE positional offsetarcsecpos.angDistancefloatumag[15.3/26.8]? SDSS u band PSF AB magnitude (G1)magphot.mag;em.opt.Ufloatnullablee_umag? Error in umagmagstat.error;phot.mag;em.opt.Ufloatnullablegmag[15.3/26.5]? SDSS g band PSF AB magnitude (G1)magphot.mag;em.opt.Bfloatnullablee_gmag? Error in gmagmagstat.error;phot.mag;em.opt.Bfloatnullablermag[15.2/22.9]? SDSS r band PSF AB magnitude (G1)magphot.mag;em.opt.Rfloatnullablee_rmag? Error in rmagmagstat.error;phot.mag;em.opt.Rfloatnullableimag[14.8/22.1]? SDSS i band PSF AB magnitude (G1)magphot.mag;em.opt.Ifloatnullablezmag[14.8/22.7]? SDSS z band PSF AB magnitude (G1)magphot.mag;em.opt.Ifloatnullablee_zmag? Error in zmagmagstat.error;phot.mag;em.opt.IfloatnullableAu[0.0/3.8] Extinction in the u band (2)magphys.absorptionfloatW1mag[9.8/19.1] WISE W1 (3.4um) band Vega magnitudemagphot.mag;em.IR.3-4umfloate_W1mag? Error in W1magmagstat.error;phot.magdoublenullableW2mag[8.8/17.9]? WISE W2 (4.6um) band Vega magnitudemagphot.mag;em.IR.4-8umdoublenullablee_W2mag? Error in W2magmagstat.error;phot.magdoublenullableW3mag[4.1/13.8]? WISE W3 (12um) band Vega magnitudemagphot.flux.density;em.IR.8-15umdoublenullablee_W3mag? Error in W3magmagstat.error;phot.magdoublenullableW4mag[-0.7/10.4]? WISE W4 (22um) band Vega magnitudemagphot.flux.density;em.IR.15-30umdoublenullablee_W4mag? Error in W4magmagstat.error;phot.magdoublenullablem20cm? FIRST (Cat. VIII/90) 20cm peak flux density expressed as AB magnitude (0 = no detection; -1.0 = source is not in FIRST area)magphot.flux.density;em.radio.750-1500MHzfloatnullablelogFX? log RASS full band count ratelog(count.s**-1)phot.count;em.X-rayfloatnullableSDSS_QDisplay the data from the SDSS Quasar Catalog DR7 (Cat. VII/260) within 1.5"meta.ref.urlcharSDSSDisplay the data from SDSS-DR7 and -DR9, Cat II/294 and V/139, within 1"meta.ref.urlcharSloanDisplay the SDSS data for this quasarmeta.ref.urlcharJ/AJ/144/49/table2The color-redshift relations of SDSS-WISE quasarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintz[0.075/5] Redshift (step of 0.05)src.redshiftfloatu-g? SDSS (u-g) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/u-g}{}{plot of u-g(z)}\fimagphot.color;em.opt.U;em.opt.Bfloatnullableg-rSDSS (g-r) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/g-r}{}{plot of g-r(z)}\fimagphot.color;em.opt.B;em.opt.Rfloatr-iSDSS (r-i) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/r-i}{}{plot of r-i(z)}\fimagphot.color;em.opt.R;em.opt.Ifloati-zSDSS (i-z) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/i-z}{}{plot of i-z(z)}\fimagphot.color;em.opt.I;em.opt.Ifloatz-W1The (SDSS z - WISE W1) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/z-W1}{}{plot of z-W1(z)}\fimagphot.color;em.IR;em.IRfloatW1-W2WISE (W1-W2) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/W1-W2}{}{plot of W1-W2(z)}\fimagphot.color;em.IR;em.IRfloatW2-W3WISE (W2-W3) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/W2-W3}{}{plot of W2-W3(z)}\fimagphot.color;em.IR;em.IRfloatW3-W4? WISE (W3-W4) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/W3-W4}{}{plot of W3-W4(z)}\fimagphot.color;em.IR;em.IRfloatnullableJ/AJ/144/49/table3A catalog of 5614 SDSS-UKIDSS-WISE quasarsULASDisplay the data from the DR9 data of the UKIDSS/LAS (Cat. II/319) within 5"meta.ref.urlcharSDSSDisplay the data from SDSS-DR7 and -DR9, Cat II/294 and V/139, within 1"meta.ref.urlcharSloanDisplay the SDSS data for this quasarmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000SDSS Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000SDSS Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainz[0.00/1.81] Redshiftsrc.redshiftfloatOff1[0/6] SDSS-UKIDSS positional offsetarcsecpos.angDistancefloatOff2[0/5] SDSS-WISE positional offsetarcsecpos.angDistancefloatumag[15.4/26.2] SDSS u band PSF AB magnitude (G1)magphot.mag;em.opt.Ufloate_umagError in umagmagstat.error;phot.mag;em.opt.Ufloatgmag[15.4/25.5] SDSS g band PSF AB magnitude (G1)magphot.mag;em.opt.Bfloate_gmagError in gmagmagstat.error;phot.mag;em.opt.Bfloatrmag[15.3/21.6] SDSS r band PSF AB magnitude (G1)magphot.mag;em.opt.Rfloate_rmagError in rmagmagstat.error;phot.mag;em.opt.Rfloatimag[15.0/21.3] SDSS i band PSF AB magnitude (G1)magphot.mag;em.opt.Ifloate_imagError in imagmagstat.error;phot.mag;em.opt.Ifloatzmag[14.7/21.1] SDSS z band PSF AB magnitude (G1)magphot.mag;em.opt.Ifloate_zmagError in zmagmagstat.error;phot.mag;em.opt.IfloatYmag[14.7/20.4] UKIDSS Y band Vega magnitudemagphot.mag;em.IR.Jfloate_YmagError in Ymagmagstat.error;phot.mag;em.opt.BfloatJmag[14.2/20.1] UKIDSS J band Vega magnitudemagphot.mag;em.IR.Jfloate_JmagError in Jmagmagstat.error;phot.mag;em.IR.JfloatHmag[13.5/19.4] UKIDSS H band Vega magnitudemagphot.mag;em.IR.Hfloate_HmagError in Hmagmagstat.error;phot.mag;em.IR.HfloatKmag[12.3/18.7] UKIDSS K band Vega magnitudemagphot.mag;em.IR.Kfloate_KmagError in Kmagmagstat.error;phot.mag;em.IR.KfloatW1mag[10.8/17.5] WISE W1 (3.4um) band Vega magnitudemagphot.mag;em.IR.3-4umfloate_W1magError in W1magmagstat.error;phot.magfloatW2mag[9.8/17.0] WISE W2 (4.6um) band Vega magnitudemagphot.mag;em.IR.4-8umfloate_W2magError in W2magmagstat.error;phot.magfloatSDSS_QDisplay the data from the SDSS Quasar Catalog DR7 (Cat. VII/260) within 1.5"meta.ref.urlcharJ/AJ/144/49/table4The color-redshift relations of SDSS-UKIDSS-WISE quasarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintz[0.075/4.9] Redshift (step of 0.05)src.redshiftfloatu-g[0.024/2.185]? SDSS (u-g) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/u-g}{}{plot of u-g(z)}\fimagphot.color;em.opt.U;em.opt.Bfloatnullableg-r[-0.05/2.43] SDSS (g-r) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/g-r}{}{plot of g-r(z)}\fimagphot.color;em.opt.B;em.opt.Rfloatr-i[-0.079/1.758] SDSS (r-i) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/r-i}{}{plot of r-i(z)}\fimagphot.color;em.opt.R;em.opt.Ifloati-z[-0.209/0.503] SDSS (i-z) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/i-z}{}{plot of i-z(z)}\fimagphot.color;em.opt.I;em.opt.Ifloatz-Y[0.388/1.101] The (SDSS z - UKIDSS Y) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/z-Y}{}{plot of z-Y(z)}\fimagphot.color;em.IR;em.IRfloatY-J[0.03/0.85] UKIDSS (Y-J) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/Y-J}{}{plot of Y-J(z)}\fimagphot.color;em.IR;em.IRfloatJ-H[0.193/0.859] UKIDSS (J-H) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/J-H}{}{plot of J-H(z)}\fimagphot.color;em.IR.J;em.IR.HfloatH-K[0.252/1.117] UKIDSS (H-K) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/H-K}{}{plot of H-K(z)}\fimagphot.color;em.IR.H;em.IR.KfloatK-W1[0.536/1.608] The (UKIDSS K - WISE W1) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/K-W1}{}{plot of K-W1(z)}\fimagphot.color;em.IR;em.IRfloatW1-W2[0.445/1.385] WISE (W1-W2) color index \ifnum\Vphase=4\else\wGraph{J/AJ/144/49/W1-W2}{}{plot of W1-W2(z)}\fimagphot.color;em.IR;em.IRfloatJ/AJ/144/49/table5A catalog of 101853 SDSS-WISE quasars by matching the WISE all-sky dataz[0.06/5.47] Redshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000SDSS Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000SDSS Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedOff[0/6] SDSS-WISE positional offsetarcsecpos.angDistancefloatumag[15.3/26.8]? SDSS u band PSF AB magnitude (G1)magphot.mag;em.opt.Ufloatnullablee_umag? Error in umagmagstat.error;phot.mag;em.opt.Ufloatnullablegmag[15.3/26.5]? SDSS g band PSF AB magnitude (G1)magphot.mag;em.opt.Bfloatnullablee_gmag? Error in gmagmagstat.error;phot.mag;em.opt.Bfloatnullablermag[15.2/22.9]? SDSS r band PSF AB magnitude (G1)magphot.mag;em.opt.Rfloatnullablee_rmag? Error in rmagmagstat.error;phot.mag;em.opt.Rfloatnullableimag[14.8/22.1]? SDSS i band PSF AB magnitude (G1)magphot.mag;em.opt.Ifloatnullablee_imag? Error in imagmagstat.error;phot.mag;em.opt.Ifloatnullablezmag[14.8/22.7]? SDSS z band PSF AB magnitude (G1)magphot.mag;em.opt.Ifloatnullablee_zmag? Error in zmagmagstat.error;phot.mag;em.opt.IfloatnullableAu[0.0/3.8] Extinction in the u band (2)magphys.absorptionfloatW1mag[9.8/19.1] WISE W1 (3.4um) band Vega magnitudemagphot.mag;em.IR.3-4umfloate_W1mag? Error in W1magmagstat.error;phot.magdoublenullableW2mag[8.8/17.9]? WISE W2 (4.6um) band Vega magnitudemagphot.mag;em.IR.4-8umdoublenullablee_W2mag? Error in W2magmagstat.error;phot.magdoublenullableW3mag[4.1/13.8]? WISE W3 (12um) band Vega magnitudemagphot.flux.density;em.IR.8-15umdoublenullablee_W3mag? Error in W3magmagstat.error;phot.magdoublenullableW4mag[-0.7/10.4]? WISE W4 (22um) band Vega magnitudemagphot.flux.density;em.IR.15-30umdoublenullablee_W4mag? Error in W4magmagstat.error;phot.magdoublenullablem20cm? FIRST (Cat. VIII/90) 20cm peak flux density expressed as AB magnitude (0 = no detection; -1.0 = source is not in FIRST area)magphot.flux.density;em.radio.750-1500MHzfloatnullablelogFX? log RASS full band count ratelog(count.s**-1)phot.count;em.X-rayfloatnullableSDSS_QDisplay the data from the SDSS Quasar Catalog DR7 (Cat. VII/260) within 1.5"meta.ref.urlcharWISEDisplay the data from the WISE all-sky data (Cat. II/311) within 5"meta.ref.urlcharSDSSDisplay the data from SDSS-DR7 and -DR9, Cat II/294 and V/139, within 1"meta.ref.urlcharSloanDisplay the SDSS data for this quasarmeta.ref.urlchar