J/ApJ/863/144ivo://CDS.VizieR/J/ApJ/863/144doi:10.26093/cds/vizier.18630144CDSSchindler J.-T.Fan X.McGreer I.D.Yang J.Wang F.Green R.,Garavito-Camargo N.Huang Y.-H.O'Donnell C.Patej A.Pucha R.,Rees J.M.Spalding E.2021-02-23T11:50:37Z2019-09-17T15:30:19ZCDS support team

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

cds-question@unistra.frquasarssurveysvisible-astronomysloan-photometryultraviolet-photometryredshiftedinfrared-photometryradio-sourcesWe present the North Galactic Cap sample of the Extremely Luminous Quasar Survey (ELQS-N), which targets quasars with M_1450_{<}-27 at 2.8<=z<5 in an area of ~7600deg^2^ of the Sloan Digital Sky Survey (SDSS) footprint with 90{deg}<RA<270{deg}. Based on a near-infrared/infrared JKW2 color cut, the ELQS selection efficiently uses random forest methods to classify quasars and to estimate photometric redshifts; this scheme overcomes some of the difficulties of pure optical quasar selection at z~3. As a result, we retain a completeness of >70% over z~3.0-5.0 at m_i_<~17.5, limited toward fainter magnitudes by the depth of the Two Micron All Sky Survey. The presented quasar catalog consists of a total of 270 objects, of which 39 are newly identified in this work with spectroscopy obtained at the Vatican Advanced Technology Telescope and the MMT 6.5m telescope. In addition to the high completeness, which allowed us to discover new quasars in the already well-surveyed SDSS North Galactic Cap, the efficiency of our selection is relatively high at ~79%. Using 120 objects of this quasar sample we are able to extend the previously measured optical quasar luminosity function (QLF) by one magnitude toward the bright end at 2.8<=z<=4.5. A first analysis of the QLF suggests a relatively steep bright-end slope of {beta}~-4 for this sample. This result contrasts with previous results in the same redshift range, which find a much flatter slope around {beta}~-2.5, but agrees with recent measurements of the bright-end slope at lower and higher redshifts. Our results constrain the bright-end slope at z=2.8-4.5 to {beta}{<}-2.94 with a 99% confidence.2018ApJ...863..144Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/863/144CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)II/328 : AllWISE Data Release (Cutri+ 2013)VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)VII/283 : The Million Quasars (Milliquas) catalog (6.3) (Flesch, 2019)J/ApJS/95/1 : Atlas of Quasar Energy Distributions (Elvis+ 1994)J/ApJ/635/123 : The SDSS-DR3 damped Ly{alpha} survey (Prochaska+, 2005)J/ApJ/640/579 : Near-infrared spectra of 27 SDSS quasars (Glikman+, 2006)J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)J/ApJS/165/1 : BAL QSOs from SDSS DR3 (Trump+, 2006)J/MNRAS/383/1513 : 2MASS, SDSS and FIRST fluxes of QSOs (Labita+, 2008)J/MNRAS/386/1605 : Luminous K-band selected QSOs from UKIDSS (Maddox+, 2008)J/ApJS/180/67 : Phot. selection of quasars from SDSS. II. (Richards+, 2009)J/MNRAS/406/1583 : Quasar from SDSS and UKIDSS (Wu+, 2010)J/MNRAS/410/860 : Redshift dependence of BAL QSOs (Allen+, 2011)J/ApJ/728/23 : GALEX UV-bright high-redshift quasars (Worseck+, 2011)J/AJ/143/119 : SDSS Quasar Lens Search. V. Final catalog (Inada+, 2012)J/ApJ/755/169 : 3<z<5 QSO luminosity function in the COSMOS (Masters+, 2012)J/ApJS/199/3 : The quasars MMT-BOSS pilot survey (Ross+, 2012)J/ApJ/746/169 : Luminosity function of broad-line quasars (Shen+, 2012)J/AJ/144/49 : Quasars from SDSS-DR7, WISE and UKIDSS surveys (Wu+, 2012)J/ApJ/768/105 : z~5 QSO LF from SDSS Stripe 82 (McGreer+, 2013)J/ApJ/773/14 : BOSS: quasar luminosity function (Ross+, 2013)J/ApJ/778/127 : UKIDSS+FIRST+SDSS red QSOs candidates (Glikman+, 2013)J/ApJS/219/39 : QSOs selection from SDSS and WISE (Richards+, 2015)J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015)J/ApJS/227/11 : PS1 z>5.6 quasars follow-up (Banados+, 2016)J/A+A/588/A103 : 2nd ROSAT all-sky survey (2RXS) source cat. (Boller+, 2016)J/A+A/585/A87 : Quasar composite made from bright QSOs (Selsing+, 2016)J/ApJ/829/33 : Luminous of high-z QSOs with SDSS and WISE. II (Yang+, 2016)J/MNRAS/473/4937 : AllWISE ctp to ROSAT/2RXS & XMMSLEW2 cat. (Salvato+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/863/144https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/863/144http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/863/144https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/863/144https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/863/144http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/863/144GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/863/144/table2 (Newly discovered quasars at z>=2.8 in the ELQS-N sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/863/144/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/863/144/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/863/144/table2?GETtext/xml+votable180.050000true120.9905916739.139736110.005555555555555556Cone search capability for table J/ApJ/863/144/table6 (The North Galactic Cap the Extremely Luminous Quasar Survey (ELQS-N) catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/863/144/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/863/144/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/863/144/table6?GETtext/xml+votable180.050000true120.3241552.176266670.0055555555555555566/4125 4292 4301 4369 4378 4389 4451 4453 4460 4504 4723 4729 4870 4891 4946 4947 4955 4971 4977 4992 5008 5082 5088 5124 5129 5142 5184 5190 5270 5278 5279 5281 5285 5302 5349 5355 5398 5458 5462 5506 5555 5563 5571 5678 5698 5723 5789 5807 5820 5879 5888 5952 5967 6028 6059 6077 6085 6106 6143 6544 6644 6652 7168 7190 7211 7307 7309 7320 7338 7416 7436 7442 7456 7469 7577 8027 8028 8039 8276 8333 8344 8345 8376 8553 8561 8582 8599 8627 8741 8799 8900 8912 8919 8985 9114 9138 9169 9186 9201 9227 9231 9314 9365 9568 9609 9721 9745 9774 9798 9806 9821 9901 9947 9988 10011 10022 10027 10029 10033 10074 10117 10137 10181 10188 10286 10289 10307 10315 10318 10382 10405 10474 10480 10491 10544 10567 10607 10629 10641 10657 10682 10685 10706 10734 10753 10921 10947 10954 10992 10996 10998 11022 11062 11082 11102 11104 11110 11180 11223 11262 11268 11287 11307 11308 11321 11337 11347 11386 11429 11479 11489 11498 11686 11751 11785 11786 11854 11940 25294 25307 25316 25953 26072 26167 26180 26239 26264 26398 26427 26453 26553 26556 26567 26879 26992 27083 27323 27341 27365 27403 27416 27429 27441 27549 27578 27608 27649 27687 27729 27756 27830 27838 27845 27846 27855 27868 27889 27907 27939 27979 28005 28015 28039 28102 28113 28147 28168 28169 28174 28181 28213 28251 28261 28281 28328 28330 28359 28389 28416 28417 28448 28453 28482 28558 28561 28563 28610 28611 28624 28644 28648 28671 31285 31308 31313 31316 31353 31375 31408 31451 31514 31546 31587 31622 32394 44873https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/863/144?format=asciiUVOpticalInfraredRadiodefaultJ/ApJ/863/144/table2Newly discovered quasars at z>=2.8 in the ELQS-N sampleFlagFlag (1)meta.code.errorcharDateObservation UT datetime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[8/17] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainimag[17/18] SDSS DR13 i-band magnitude, dereddened AB magmagphot.mag;em.opt.Ifloate_imag[0.01/0.06] Uncertainty in imagmagstat.error;phot.magfloatM1450[-29/-27] Absolute magnitude at rest-frame 1450{AA}magphys.magAbsfloatzspec[2.8/4.5] Spectroscopic redshiftsrc.redshiftfloatNUVmag[20.4/22.8]? GALEX GR6/7 Near-UV magnitudemagphot.mag;em.UV.200-300nmfloatnullablee_NUVmag[0.05/0.5]? Uncertainty in NUVmagmagstat.error;phot.magfloatnullableFUVmag[21.4/22.1]? GALEX GR6/7 Near-UV magnitudemagphot.mag;em.UV.100-200nmfloatnullablee_FUVmag[0.3/0.6]? Uncertainty in FUVmagmagstat.error;phot.magfloatnullableBAL[-1/1]? Broad absorption line flag (G1)meta.codeintnullableELQSDisplay the ELQS-N quasar catalog parameters for this QSO (link to Table 6)meta.ref.urlcharJ/ApJ/863/144/table6The North Galactic Cap the Extremely Luminous Quasar Survey (ELQS-N) catalogNUVmag[19.6/23.8]? GALEX GR6/7 Near-UV fluxmagphot.mag;em.UV.200-300nmdoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNNewly discovered quasar (link to Table 2)meta.ref.urlintnullableWISEAAllWISE name (JHHMMSS.ss+DDMMSS.s; as in II/328)meta.id;meta.maincharRASdegSDSS DR13 Right Ascension (J2000)degpos.eq.raDESdegSDSS DR13 Declination (J2000)degpos.eq.decRAJ2000Hour of SDSS DR13 Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of SDSS DR13 Declination (J2000)pos.eq.dec;meta.mainRAWdegWISE Right Ascension (J2000)degpos.eq.raDEWdegWISE Declination (J2000)degpos.eq.decr_zbestReference to QSO classification (1)meta.ref;pos.framecharzbest[2.8/4.7] Best redshift of the quasar according to the referencesrc.redshift;pos.heliocentricdoubleM1450[-31/-27] Absolute magnitude, 1450{AA}, calculated using the k-correction determined in this workmagphys.magAbs;em.UVdoubleProb[0/1] Selection probability according to our completeness calculationstat.probabilityfloatumag[17.7/26.4] SDSS DR13 u-band magnitude, dereddened AB mag (2)magphot.mag;em.opt.Ufloate_umag[0.01/3.7] Uncertainty in umag (2)magstat.error;phot.magfloatgmag[16.4/20.4] SDSS DR13 g-band magnitude, dereddened AB mag (2)magphot.mag;em.opt.Bfloate_gmag[0.01/0.3] Uncertainty in gmag (2)magstat.error;phot.magfloatrmag[15.3/19] SDSS DR13 r-band magnitude, dereddened AB mag (2)magphot.mag;em.opt.Rfloate_rmag[0.009/0.1] Uncertainty in rmag (2)magstat.error;phot.magfloatimag[14.8/18] SDSS DR13 i-band magnitude, dereddened AB mag (2)magphot.mag;em.opt.Ifloate_imag[0.009/0.2] Uncertainty in imag (2)magstat.error;phot.magfloatzmag[14.5/18.1] SDSS DR13 z-band magnitude, dereddened AB mag (2)magphot.mag;em.opt.Ifloate_zmag[0.01/0.2] Uncertainty in zmag (2)magstat.error;phot.magfloatJmag[14.2/18.1] 2MASS J-band, dereddened AB magmagphot.mag;em.IR.Jfloate_Jmag[0.02/0.3]? Uncertainty in Jmagmagstat.error;phot.magfloatnullableHmag[14/18.4] 2MASS H-band, dereddened AB magmagphot.mag;em.IR.Hfloate_Hmag[0.02/0.4]? Uncertainty in Hmagmagstat.error;phot.magfloatnullableKmag[13.8/18.1] 2MASS Ks-band, dereddened AB magmagphot.mag;em.IR.Kfloate_Kmag[0.02/0.4]? Uncertainty in Kmagmagstat.error;phot.magfloatnullableW1mag[13.7/18.2] ALLWISE W1 band, dereddened AB magmagphot.mag;em.IR.3-4umfloate_W1mag[0.02/0.2] Uncertainty in W1magmagstat.error;phot.magfloatW2mag[13.8/18.1] ALLWISE W2 band, dereddened AB magmagphot.mag;em.IR.4-8umfloate_W2mag[0.02/0.2] Uncertainty in W2magmagstat.error;phot.magfloatE(B-V)[0.006/0.4]? E(B-V) color excessmagphot.color.excessfloatnullableAi[0.006/0.6] Extinction in the SDSS i-bandmagphys.absorptionfloatFIRSTBoolean to indicate successful matches with the FIRST catalogmeta.codecharSepFIRST[1.6e-5/0.0006]? Distance of the FIRST match relative to the SDSS positionarcsecpos.angDistancedoublenullableFpkFIRST[1/2405]? FIRST peak fluxmJy/beamphot.flux.density;em.radio.750-1500MHzfloatnullablee_FpkFIRST[0.1/0.6]? RMS error on the FIRST fluxmJy/beamstat.errorfloatnullableFintFIRST[0.8/2431]? FIRST integrated fluxmJyphot.flux.density;em.radio.750-1500MHzfloatnullableGALEXBoolean to indicate successful matches with the GALEX GR6/7 catalogmeta.idcharSepGALEX[0.1/1.7]? Distance of the GALEX GR6/7 match relative to the SDSS positionarcsecpos.angDistancedoublenullablee_NUVmag[0.01/0.7]? Uncertainty in NUVmagmagstat.error;phot.magdoublenullableFUVmag[20.5/23]? GALEX GR6/7 Far-UV fluxmagphot.mag;em.UV.100-200nmdoublenullablee_FUVmag[0.03/0.6]? Uncertainty in FUVmagmagstat.error;phot.magdoublenullableTRXSBoolean to indicate successful matches to the ROSAT 2RXS AllWISE counterpartsmeta.codecharSepTRXS[0/2.8e-14]? Match distance between the ELQS AllWISE position to the ROSAT 2RXS AllWISE position (3)arcsecpos.angDistancedoublenullablef_TRXS? Match Flag for ROSAT 2RXS AllWISE (4)meta.codefloatnullableFTRXS[1.7e-13/5.5e-13]? 2RXS flux, erg/s/cm2mW.m**-2phot.flux;em.X-raydoublenullablee_FTRXS[6.5e-14/2.2e-13]? Uncertainty in FTRXSmW.m**-2stat.errordoublenullableBAL[-1/1]? Broad absorption line flag (G1)meta.codeintnullableQLFIncluded in the estimation of the quasar luminosity function? (5)meta.codecharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar