J/ApJ/829/33ivo://CDS.VizieR/J/ApJ/829/33doi:10.26093/cds/vizier.18290033CDSYang J.Wang F.Wu X.-B.Fan X.McGreer I.D.Bian F.Yi W.Yang Q.,Ai Y.Dong X.Zuo W.Green R.Jiang L.Wang S.Wang R.Yue M.2018-05-17T11:39:14Z2018-03-09T13:01:23ZCDS support team

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

cds-question@unistra.frquasarsredshiftedvisible-astronomysloan-photometryinfrared-photometryspectroscopyThis is the second paper in a series on a new luminous z~5 quasar survey using optical and near-infrared colors. Here we present a new determination of the bright end of the quasar luminosity function (QLF) at z~5. Combining our 45 new quasars with previously known quasars that satisfy our selections, we construct the largest uniform luminous z~5 quasar sample to date, with 99 quasars in the range of 4.7<=z<5.4 and -29<M_1450_<=-26.8, within the Sloan Digital Sky Survey (SDSS) footprint. We use a modified 1/V_a_ method including flux limit correction to derive a binned QLF, and we model the parametric QLF using maximum likelihood estimation. With the faint-end slope of the QLF fixed as {alpha}=-2.03 from previous deeper samples, the best fit of our QLF gives a flatter bright end slope {beta}=-3.58+/-0.24 and a fainter break magnitude M_1450_^*^=-26.98+/-0.23 than previous studies at similar redshift. Combined with previous work at lower and higher redshifts, our result is consistent with a luminosity evolution and density evolution model. Using the best-fit QLF, the contribution of quasars to the ionizing background at z~5 is found to be 18%-45% with a clumping factor C of 2-5. Our sample suggests an evolution of radio loud fraction with optical luminosity but no obvious evolution with redshift.2016ApJ...829...33Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/829/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)II/328 : AllWISE Data Release (Cutri+ 2013)II/294 : The SDSS Photometric Catalog, DR7 (Adelman-McCarthy+, 2009)V/147 : The SDSS Photometric Catalog, DR12 (Alam+, 2015)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/A+A/585/A87 : Quasar composite made from bright QSOs (Selsing+, 2016)J/ApJ/819/24 : z>4.5 QSOs with SDSS and WISE. I. Opt. spectra (Wang+, 2016)J/ApJ/794/75 : HST-COS UV spectra observations of AGNs (Stevans+, 2014)J/ApJ/768/105 : z~5 QSO luminosity function from SDSS Stripe 82J/ApJ/773/14 : BOSS: quasar luminosity function (Ross+, 2013)J/ApJ/755/169 : 3<z<5 quasar luminosity function in COSMOS (Masters+, 2012)J/ApJ/728/23 : GALEX UV-bright high-redshift quasars (Worseck+, 2011)J/ApJ/710/1498 : QSO luminosity function at z~4 (Glikman+, 2010)J/AJ/131/2788 : Redshifts in the SFQS survey (Jiang+, 2006)J/AJ/131/2766 : Quasar luminosity function from SDSS-DR3 (Richards+, 2006)J/MNRAS/341/993 : u_j_br photometry and redshifts of QSOs (Cirasuolo+, 2003)J/ApJ/445/62 : Radio properties of optically selected quasars (Hooper+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/829/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/829/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/829/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/829/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/829/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/829/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/829/33/table1 (z~5 quasar used for QLF measurement)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/829/33/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/829/33/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/829/33/table1?GETtext/xml+votable180.050000true2.214291736.27041390.0055555555555555566/33 34 424 717 2515 2520 4626 4754 4872 4905 5186 5229 5333 5458 5537 5752 5923 6096 6112 6172 6342 6415 6547 6917 7197 7464 8329 8354 8515 8722 8813 8819 8829 8846 9195 9275 9285 9615 9659 9716 9966 10024 10027 10123 10193 10197 10246 10336 10451 10466 10497 10656 10759 10914 11473 12567 13683 17649 17706 17800 17898 18061 18222 18378 18638 19028 19046 19067 19104 19214 19374 19676 19728 20037 20145 20390 20441 22393 22826 23274 23838 26080 26280 26542 26589 26955 27359 27615 27833 27901 28023 28067 31529 31539 31705 32438 40938 44391 443992.040811542443644e-19 3.5010283109654867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/829/33?format=asciiOpticalInfrareddefaultJ/ApJ/829/33/table1z~5 quasar used for QLF measurementSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identifier (JHHMMSS.ss+DDMMSS.ss)meta.id;meta.maincharf_NameFlag on Name (1)meta.codecharrmag[19.48/22.35] SDSS r magnitude (2)magphot.mag;em.opt.Rfloate_rmag[0.02/0.15] Error in rmag (2)magstat.error;phot.mag;em.opt.Rfloatimag[17.96/20.15] SDSS i magnitude (2)magphot.mag;em.opt.Ifloate_imag[0.01/0.07] Error in imag (2)magstat.error;phot.mag;em.opt.Ifloatzmag[17.47/19.49] SDSS z magnitude (2)magphot.mag;em.opt.Ifloate_zmag[0.02/0.1] Error in zmag (2)magstat.error;phot.mag;em.opt.IfloatW1mag[14.31/16.89] W1 magnitude (3)magphot.mag;em.IR.3-4umfloate_W1mag[0.03/0.28] Error in W1mag (3)magstat.error;phot.magfloatW2mag[13.46/16.11] W1 magnitude (3)magphot.mag;em.IR.4-8umfloate_W2mag[0.03/0.18] Error in W2mag (3)magstat.error;phot.magfloatRedshift[4.7/5.37] Redshiftsrc.redshiftfloatM1450[-28.99/-26.8] Absolute 1450{AA} AB magnitudemagphys.magAbsfloatNotesQuasar origin (4)meta.notecharPapIDisplay data from Paper I (Wang et al. 2016, Cat. J/ApJ/819/24)meta.ref.urlcharSDSSDisplay data from the SDSS-DR7 (Adelman-McCarthy+, 2009, Cat. II/294) and from the SDSS-DR12 (Alam+, 2015, Cat. V/147) catalogs within 1"meta.ref.urlcharWISEDisplay data from the the WISE all-sky (Cutri+, 2012, II/311) and the AllWISE data (Cutri+, 2013, II/328) catalogs within 1"meta.ref.urlchar_RAPositions from Names (right ascension part)degpos.eq.ra;meta.main_DEPositions from Names (declination part)degpos.eq.dec;meta.main