J/MNRAS/468/77ivo://CDS.VizieR/J/MNRAS/468/77doi:10.26093/cds/vizier.74680077CDSEftekharzadeh S.Myers A.D.Hennawi J.F.Djorgovski S.G.Richards G.T.,Mahabal A.A.Graham M.J.2024-08-17T20:18:55Z2020-04-15T09:16:34ZCDS support team

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

cds-question@unistra.frsurveysquasarsWe present the most precise estimate to date of the clustering of quasars on very small scales, based on a sample of 47 binary quasars with magnitudes of g < 20.85 and proper transverse separations of ~25h^-1^kpc. Our sample of binary quasars, which is about six times larger than any previous spectroscopically confirmed sample on these scales, is targeted using a kernel density estimation (KDE) technique applied to Sloan Digital Sky Survey (SDSS) imaging over most of the SDSS area. Our sample is 'complete' in that all of the KDE target pairs with 17.0<=R<=36.2h^-1^kpc in our area of interest have been spectroscopically confirmed from a combination of previous surveys and our own long-slit observational campaign. We catalogue 230 candidate quasar pairs with angular separations of <8 arcsec, from which our binary quasars were identified. We determine the projected correlation function of quasars (<W>_ p_) in four bins of proper transverse scale over the range 17.0<=R<=36.2h^-1^kpc. The implied small-scale quasar clustering amplitude from the projected correlation function, integrated across our entire redshift range, is A=24.1+/-3.6 at ~26.6h^-1^kpc. Our sample is the first spectroscopically confirmed sample of quasar pairs that is sufficiently large to study how quasar clustering evolves with redshift at ~25h^-1^kpc. We find that empirical descriptions of how quasar clustering evolves with redshift at ~25h^-1^Mpc also adequately describe the evolution of quasar clustering at ~25h^-1^kpc.2017MNRAS.468...77Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/468/77CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/243 : SDSS quasar catalog. III. (Schneider+, 2005)VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)VII/279 : SDSS quasar catalog: twelfth data release (Paris+, 2017)J/ApJ/651/61 : Optically thick absorbers near luminous quasars (Hennawi+ 2006)J/AJ/135/496 : SDSS quasar lens search. II. (Inada+, 2008)J/ApJ/678/635 : Spectroscopy of quasar binary candidates (Myers+, 2008)J/ApJ/776/136 : QPQ VI. HI absorption of z~2 quasars (Prochaska+, 2013)J/ApJ/796/140 : Circumgalactic medium surrounding z~2 quasars (Prochaska+ 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/468/77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/468/77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/468/77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/468/77https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/468/77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/468/77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/468/77/table5 (Candidate quasar pairs drawn from our parent sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/468/77/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/468/77/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/468/77/table5?GETtext/xml+votable180.050000true184.191435.494880.005555555555555556Cone search capability for table J/MNRAS/468/77/table6 (Complete 47 spectroscopically confirmed binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/468/77/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/468/77/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/468/77/table6?GETtext/xml+votable180.050000true109.5146240.350750.0055555555555555566/4108 4159 4166 4186 4297 4312 4354 4428 4438 4444 4457 4556 4558-4559 4582 4608 4675 4701 4748 4912 4919 4947 4987 4997 5005 5024 5048 5121 5306 5372 5381 5442 5502 5556 5663 5733 5785 5817 5876 5945 5968 5990 6003 6078 6118 6166 6192 6194 6250 6353 6362 6394 6427 6575 6578 6605 6654 6738 6917 7208 7210 7222 7256 7337 7363 7424 7426 7479 7508 7561 7563 8292 8303 8321 8330 8352-8353 8392 8407 8489 8499 8580 8638 8645 8691 8700 8725 8733 8760 8769 8824 8870 8922 8995 9008 9027 9058 9061-9062 9098 9138 9168 9183 9268 9320 9327 9354 9359-9360 9444 9452 9458 9813 9890 9905 10094 10115 10120 10148 10152 10189 10272 10288 10295 10336 10396 10488 10503 10555 10750 10783 10880 10925 10933 10938 10974 11064 11254 11316 11341 11417 11431 11434 11456 11477 11739 11814 11826 11913 11955 12405 16893 17320 17756 18002 18406 18580 18610 18780 19426 19993 20007 21878 21976 22014 22390 22398 23101 23144 25588 26059 26087 26164 26191 26298 26327 26353 26395 26451 26454 26489 26531 26555 26561 26578 27017 27021 27096 27276 27371 27398 27414 27420 27447 27493 27500 27605 27643 27700 27759 27826 27852 27855 27858 27865 27872 27895 27952 27977 28010 28185 28217 28319 28387 28481-28482 28562 28606 28628 28640 31485 31598 31678 31719 32395 32436https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/468/77?format=asciidefaultJ/MNRAS/468/77/table5Candidate quasar pairs drawn from our parent samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDthetaAngular separation of the two members of the pair, {DELTA}{theta}arcsecpos.angDistance;src.orbitalfloatObsStat[0/2]? Observational status of the pair (1)meta.code.statusintnullableRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainimagDereddened i magnitudemagphot.mag;em.opt.IfloatgmagDereddened g magnitudemagphot.mag;em.opt.BfloatClassSpectroscopic classification (2)meta.code.classcharzsp? Measured or reported spectroscopic redshift for the members, -1 for objects with no redshiftsrc.redshiftfloatnullableQQ?[1/4]? Classification of the pair (3)meta.code.classintnullableNote[*] Note (4)meta.notecharJ/MNRAS/468/77/table6Complete 47 spectroscopically confirmed binariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameAName of the brighter quasar of the binary, SDSS JHHMM+DDMM A (1)meta.id.part;meta.maincharRAARight ascension (J2000) of brighter quasardegpos.eq.ra;meta.mainDEADeclination (J2000) of brighter quasardegpos.eq.dec;meta.mainimagADereddened i magnitude of brighter quasarmagphot.mag;em.opt.IfloatgmagADereddened g magnitude of brighter quasarmagphot.mag;em.opt.BfloatNameBName of the fainter quasar of the binary, SDSS JHHMM+DDMM B (1)meta.id.part;meta.maincharRABdegRight ascension (J2000) of fainter quasardegpos.eq.raDEBdegDeclination (J2000) of fainter quasardegpos.eq.decimagBDereddened i magnitude of fainter quasarmagphot.mag;em.opt.IfloatgmagBDereddened g magnitude of fainter quasarmagphot.mag;em.opt.BfloatDthetaAngular separation of the quasars in the binaryarcsecpos.angDistance;src.orbitalfloatzspSpectroscopic redshift for the binarysrc.redshiftfloat|DV|Velocity difference between the quasars in the binarykm/sphys.veloc;arith.diffintRTransverse proper separation between the quasars in the binary, in h^-1^kpc unitkpcpos.distancefloatJ/MNRAS/468/77/table3Normalized distribution of the spectroscopic redshifts for quasar candidates in our parent samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzminLower value of {Delta}z interval (1)src.redshift;stat.minfloatzmaxUpper value of {Delta}z interval (1)src.redshift;stat.maxfloat(1/N)dN/dzNormalized distributionstat.fit.paramdouble