J/ApJ/685/773ivo://CDS.VizieR/J/ApJ/685/773doi:10.26093/cds/vizier.16850773CDSGibson R.R.Brandt W.N.Schneider D.P.2018-01-05T08:56:00Z2010-02-05T11:31:10ZCDS support team

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

cds-question@unistra.frsurveysquasarsx-ray-sourcesultraviolet-astronomyredshiftedWe analyze archived Chandra and XMM-Newton X-ray observations of 536 Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) quasars (QSOs) at 1.7<=z<=2.7 in order to characterize the relative UV and X-ray spectral properties of QSOs that do not have broad UV absorption lines (BALs). We constrain the fraction of X-ray-weak, non-BAL QSOs and find that such objects are rare; for example, sources underluminous by a factor of 10 comprise <~2% of optically selected SDSS QSOs. X-ray luminosities vary with respect to UV emission by a factor of <~2 over several years for most sources. UV continuum reddening and the presence of narrow-line absorbing systems are not strongly associated with X-ray weakness in our sample. X-ray brightness is significantly correlated with UV emission-line properties, so that relatively X-ray-weak, non-BAL QSOs generally have weaker, blueshifted CIV {lambda}1549 emission and broader CIII] {lambda}1909 lines. The CIV emission-line strength depends on both UV and X-ray luminosity, suggesting that the physical mechanism driving the global Baldwin effect is also associated with X-ray emission.2008ApJ...685..773Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/685/773CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)J/AJ/133/313 : AGN from RASS and SDSS DR5 (Anderson+, 2007)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/ApJ/685/773https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/685/773http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/685/773https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/685/773https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/685/773http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/685/773GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/685/773/xqsos (Source information and UV emission line measurements of QSOs at redshifts 1.7<=z<=2.7)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/685/773/xqsos?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/685/773/xqsos?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/685/773/xqsos?GETtext/xml+votable180.050000true1.7254167-0.25927780.0055555555555555565/6814 6/0 4139 4229 4759 4790 4808 4835 4838 4850 4976 4990 4992 5016 5069 5090 5091 5099 5106 5112 5116 5241 5299 5305 5362 5420 5423 5429 5437 5438 5482 5504 5523 5538 5545 5564 5569 5587 5591 5618 5671 5675 5687 5689 5715 5721 5723 5731 5733 5762 5798 5799 5825 5847 5854 5860 5862 5863 5864 5970 5975 5976 5984 5988 5999 6047 6056 6057 6073 6077 6079 6086 6098 6196 6197 6253 6340 6467 6498 6541 6552 6559 6574 6581 6623 7240 7241 7261 7281 7298 7311 7316 7379 7424 7446 7456 7459 7478 7482 7485 7494 7498 7500 7522 7552 7568 8203 8224 8227 8659 9144 9146 9147 9148 9150 9151 9185 9367 9387 9401 9443 9468 9506 9512 9618 9632 9732 9747 9776 9842 9855 9997 10074 10153 10193 10209 10214 10220 10221 10222 10293 10302 10345 10391 10401 10404 10512 10513 10515 10517 10518 10519 10527 10529 10549 10578 10588 10589 10599 10601 10604 10607 10618 10630 10657 10664 10694 10706 10709 10734 10799 10841 10843 10883 10888 10896 10911 10938 10940 10968 10970 10977 10979 11027 11071 11073 11080 11084 11111 11112 11117 11179 11191 11194 11204 11206 11252 11264 11314 11339 11342 11347 11351 11352 11372 11377 11392 11410 11424 11425 11428 11460 11467 11589 11787 11791 11807 11932 11953 17237 17492 17502 17514 17555 17727 17749 17752 17754 17755 17761 17805 17813 17815 17816 17818 17819 17829 17997 18001 18007 18009 18011 18022 18024 18025 18032 18034 18061 18071 18072 18073 18075 18076 18086 18088 18089 18092 18096 18112 18385 18406 18411 18607 18772 18773 18774 18780 18782 18800 18880 19028 19033 19036 19056 19087 19760 19842 23145 23182 23190 23191 23197 23209 23210 23211 25853 25907 25909 25934 25942 25945 25950 25965 25977 25981 25982 25983 25991 26019 26056 26078 26175 26206 26213 26214 26215 26219 26221 26223 26264 26292 26313 26317 26336 26547 26563 26955 26966 26972 26975 26994 27053 27100 27102 27127 27133 27247 27287 27305 27314 27318 27342 27343 27349 27351 27361 27383 27402 27428 27440 27462 27511 27520 27530 27537 27554 27617 27652 27664 27699 27714 27732 27756 27758 27772 27773 27861 27868 27914 27918 27936 27941 27942 27950 27954 28173 28184 28511 28593 28631 28632 30029 31396 31398 31399 31628 32484 36773 36785 36792 36794 36863 45044 45046 49106 49123https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/685/773?format=asciiX-rayUVOpticaldefaultJ/ApJ/685/773/xqsosSource information and UV emission line measurements of QSOs at redshifts 1.7<=z<=2.7recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS source name JHHMMSS.ss+DDMMSS.smeta.id;meta.maincharzSpectroscopic redshiftsrc.redshiftfloatObsIdChandra or XMM observation identification number (1)meta.id;obslongExpoX-ray exposure time (2)kstime.duration;obs.exposure;em.X-rayfloatSctsObserved-frame soft (0.5-2keV) counts in source regionctphot.count;em.X-rayintHctsObserved-frame hard (2-8keV) counts in source regionctphot.count;em.X-rayintX[0/1] X-ray detected? (1=yes)meta.codeintB[0/1] Source in sample B? (1=yes)meta.codeintl_logR*Limit flag on logR*meta.code.errorcharlogR*Radio-loudness parameter (5)phot.flux;arith.ratiofloatCIV.0Rest-frame balnicity index for CIV absorption (6)km/sspect.line.eqWidthintMgNumber of narrow Mg II absorption systems (7)meta.numberintL1400Log of monochromatic luminosity at 1400{AA} (8)log(1e-07W.Hz**-1)phys.luminosityfloatL2500Log of monochromatic luminosity at 2500{AA} (8)log(1e-07W.Hz**-1)phys.luminosityfloatl_L2keVLimit flag on log2keVmeta.code.errorcharL2keVLog of monochromatic luminosity at 2keV (8)log(1e-07W.Hz**-1)phys.luminosity;em.X-ray.softfloatl_a.OXLimit flag on a.OXmeta.code.errorchara.OXX-ray/optical spectral index (9)spect.indexfloate_a.OX? Uncertainty in a.OX (10)stat.errorfloatnullablel_Da.OXLimit flag on Da.OXmeta.code.errorcharDa.OXRelative X-ray brightness (11)phys.luminosity;em.X-rayfloatC4EWEquivalent width of CIV (1549{AA})0.1nmspect.line.eqWidthfloatC4WaveCentral wavelength of CIV (1549{AA})0.1nmem.wl.centralfloatC4FWHMFull-Width at Half-Maximum of CIV (1549{AA})0.1nmspect.line.widthfloatC3EW? Equivalent width of CIII] (1909{AA}) (1)0.1nmspect.line.eqWidthfloatnullableC3Wave? Central wavelength of CIII] (1909{AA}) (1)0.1nmem.wl.centralfloatnullableC3FWHM? Full-Width at Half-Maximum of CIII] (1909{AA}) (1)0.1nmspect.line.widthfloatnullableSloanDisplay the SDSS data for this quasarmeta.ref.urlcharDR5Display the SDss-DR5 data (Adelman-McCarthy et al. 2007, Cat. II/276)meta.ref.urlcharSimbadSimbad column added by the CDSchar_RApositions form SDSS name (right ascension part)degpos.eq.ra;meta.main_DEpositions form SDSS name (declination part)degpos.eq.dec;meta.main