J/ApJ/657/116ivo://CDS.VizieR/J/ApJ/657/116doi:10.26093/cds/vizier.16570116CDSKelly B.C.Bechtold J.2017-10-11T05:13:53Z2009-03-07T22:25:37ZCDS support team

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

cds-question@unistra.frquasarsx-ray-sourcesredshiftedWe report new Chandra observations of seven optically faint, z~4 radio-quiet quasars (RQQs). We have combined these new observations with previous Chandra observations of RQQs to create a sample of 174 sources. These sources have 0.1<z<4.7, and 10^44^ergs/s<{nu}L_{nu}_(2500{AA})<10^48^ergs/s. The X-ray detection fraction is 90%.2007ApJ...657..116Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/657/116CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/657/116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/657/116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/657/116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/657/116https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/657/116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/657/116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/657/116/table2 (List of Archival Sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/657/116/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/657/116/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/657/116/table2?GETtext/xml+votable180.050000true0.6279170.8330560.005555555555555556Cone search capability for table J/ApJ/657/116/table4 (X-ray and UV Parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/657/116/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/657/116/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/657/116/table4?GETtext/xml+votable180.050000true0.62795830.83305560.0055555555555555566/0 592 2247 4125 4169 4790 5090 5563 5731 5843 5881 5925 5930 5985 5995 6047 6069 6071 6073 6075 6079 6090 6112 6427 6552 6554 7178 7242 7261 7273 7279 7281 7309 7424 7459 7464 9163 9443 9506 9512 9632 9885 9959 9997 10072 10193 10217 10222 10473 10589 10601 10694 10706 10743 10911 11206 11252 11299 11353 11372 11461 11489 11596 17497 17735 17754 17815 17819 17829 17840 17895 18009 18022 18024 18032 18075 18076 18089 18096 18200 18411 18466 18537 18546 18780 18800 19457 19458 19740 23201 25597 25938 25948 25950 25956 25969 25977 25981 26005 26022 26175 26203 26204 26209 26221 26266 26276 26277 26281 26285 26295 26298 26316 26338 26846 26955 26977 26995 27053 27224 27428 27440 27476 27530 27552 27652 27714 27760 31310 32500 32502 33269 36217 36271 36785 36792https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/657/116?format=asciiX-rayOpticaldefaultJ/ApJ/657/116/table2List of Archival Sourcesl_FXLimit flag on FXmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identification (HHMM+DDMM, J2000, QSO JHHMM+DDMM in Simbad)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatr_zObserved frame optical spectrum reference (3)meta.ref;pos.frameintrmagThe r-band apparent magnitudemagphot.mag;em.opt.Rfloatr_rmagReference for rmag (3)meta.ref;pos.frameintOBSIDObservation identification numbermeta.id;obsintthetaOff-axis anglearcmininstr.offsetfloatCtsNumber of observed background-subtracted 0.3-7.0keV source counts (1)ctphot.count;em.X-rayfloatExpTimeExposure time (1)kstime.duration;obs.exposurefloatFXUnabsorbed 2-10 keV flux (2)1e-17W.m**-2phot.flux;em.X-rayfloate_FX? Uncertainty in FX (2)1e-17W.m**-2stat.errorfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharJ/ApJ/657/116/table4X-ray and UV ParameterszRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (HHMM+DDMM, J2000)meta.id;meta.maincharprimaryNew[e] e: One of seven new Chandra observationsmeta.codecharNHGalactic Hydrogen column density (1)1e+20cm**-2phys.columnDensity;pos.galacticfloatl_n0Limit flag on n0meta.code.errorcharn0Normalization value at 1keV (2)1e-06cm**-2.s**-1.keV**-1stat.fit.paramfloatE_n0? Upper 1{sigma} error in n01e-06cm**-2.s**-1.keV**-1stat.error;stat.maxfloatnullablee_n0? Lower 1{sigma} error in n01e-06cm**-2.s**-1.keV**-1stat.errorfloatnullableGamma? Photon index (3)meta.code;spect.indexfloatnullableE_Gamma? Upper 1{sigma} error in Gammastat.error;stat.maxfloatnullablee_Gamma? Lower 1{sigma} error in Gammastat.errorfloatnullablelogL2500Log of the 2500{AA} luminosity (4)1e-07Wphys.luminosityfloatl_logL2keVLimit flag on logL2keVmeta.code.errorcharlogL2keVLog of the 2keV luminosity (4)1e-07Wphys.luminosity;em.X-rayfloatl_a-oxLimit flag on a-oxmeta.code.errorchara-oxThe X-ray to UV/optical flux ratiophot.flux;arith.ratiofloata-UV? The UV spectral slope (5)spect.indexfloatnullableSimbadNameSimbad column added by the CDSmeta.idchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main