J/MNRAS/504/2767ivo://CDS.VizieR/J/MNRAS/504/2767doi:10.26093/cds/vizier.75042767CDSLi J.-T.Wang F.Yang J.Bregman J.N.Fan X.Zhang Y.2024-11-06T20:33:36Z2024-05-27T10:07:18ZCDS support team

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

cds-question@unistra.frx-ray-sourcesaccretionactive-galactic-nucleiblack-holesquasarsredshiftedphotometryradio-sourcesinfrared-sourcesvisible-astronomyX-ray observations provide a unique probe of the accretion disc corona of supermassive black holes (SMBHs). In this paper, we present a uniform Chandra X-ray data analysis of a sample of 152 z >= 4.5 quasars. We firmly detect 46 quasars of this sample in 0.5-2 keV above 3{sigma} and calculate the upper limits of the X-ray flux of the remaining. We also estimate the power-law photon index of the X-ray spectrum of 31 quasars. 24 of our sample quasars are detected in the FIRST or NVSS radio surveys; all of them are radio-loud. We statistically compare the X-ray properties of our z >= 4.5 quasars to other X-ray samples of active galactic nuclei (AGNs) at different redshifts. The relation between the rest-frame X-ray luminosity and other quasar parameters, such as the bolometric luminosity, UV luminosity, or SMBH mass, shows large scatters. These large scatters can be attributed to the narrow luminosity range at the highest redshift, the large measurement error based on relatively poor X-ray data, and the inclusion of radio-loud quasars in the sample. The L_X_-L_UV_ relationship is significantly sublinear. We do not find a significant redshift evolution of the L_X_-L_UV_ relation, expressed either in the slope of this relation, or the departure of individual AGNs from the best-fitting {alpha}_OX_-L_UV_ relation ({Delta}{alpha}_OX_). The median value of the X-ray photon index is {Gamma} ~= 1.79, which does not show redshift evolution from z = 0 to z ~ 7. The X-ray and UV properties of the most distant quasars could potentially be used as a standard candle to constrain cosmological models. The large scatter of our sample on the Hubble diagram highlights the importance of future large unbiased deep X-ray and radio surveys in using quasars in cosmological studies.2021MNRAS.504.2767Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/504/2767CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/819/24 : z>4.5 QSOs with SDSS and WISE. I. Opt. spectra (Wang+, 2016)IX/59 : XMM-Newton Serendipitous Source Catalogue 4XMM-DR9 (Webb+, 2020)J/ApJ/829/33 : Luminous of high-z QSOs with SDSS and WISE. II (Yang+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/504/2767https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/504/2767http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/504/2767https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/504/2767https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/504/2767http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/504/2767GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/504/2767/tablea1 (Observational and physical properties of the 152 QSos final sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/504/2767/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/504/2767/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/504/2767/tablea1?GETtext/xml+votable180.050000true0.664135833325.84297752780.0055555555555555566/424 522 2187 2247 2584 2694 4279 5170 5517 5528 5630 5906 5923 5928 6071 6073 6077 6112 6172 6415 6552 6581 7326 7378 7459 7464 7478 7942 8289 8553 8713 8843 8845 9144 9146 9151 9275 9373 9394 9439 9469 9615 9735 9831 9966 10193 10334 10456 10501 10512 10516 10518 10520 10598 10609 10734 10747 10759 11030 11161 11252 11436 11443 11446 11460 12567 12576 13418 15578 16531 17239 17494 17679 17690 17749 17767 17772 17812-17813 17872 18009 18061 18077 18088 18155 18403 18601 18627 18858 19028 19033 19202 19676 20116 20273 21872 21877 22393 23078 23210 25330 25540 25844 25969 25977 26204 26215 26217 26221 26239 26262 26280-26281 26318 26470 26846 26955 26973 27022 27124 27256 27258 27367 27440 28023 28452 28504 30039 31310 31379 31629 32436 32438 33746 34512 35100 35727 35895 35952 36792 44429 44463 44833 48423 48715https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/504/2767?format=asciiX-rayOpticalInfraredRadiodefaultJ/MNRAS/504/2767/tablea1Observational and physical properties of the 152 QSos final sampleSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOther name of the QSO (OTHERNAMES)meta.idcharRAJ2000Right ascension (J2000) (QSORAh)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (QSODEd)pos.eq.dec;meta.mainRefReference discovering the QSO (DISCOVERY)meta.ref;pos.framecharzQSOBest Redshift of the QSO (REDSHIFT)src.redshift;pos.heliocentricdoublee_zQSO? Error of the redshift (REDSHIFT_ERR)stat.errordoublenullablezMETHODMethod used to measure the redshift (REDSHIFT_METHOD) (2)meta.code;obschare_alphaOXLower error 1 sigma of alphaOX (EALPHAOXL)stat.errordoubleE_alphaOXUpper error 1 sigma of alphaOX (EALPHAOXH)stat.error;stat.maxdoubleObsIDChaList of Chandra observation ID used in this work (OBSIDCHANDRA)meta.id;instr.setup;obscharTexpChaTotal effective Chandra exposure time (TEXPCHANDRA)kstime.duration;obs.exposuredoubleXMMdataList of XMM-Newton observations covering this QSO (XMMDATA)meta.id;obscharXMMObjObject name of the XMM-Newton observations covering this QSO (XMMOBJ)meta.idcharNIRrefReferences of the near-IR spectra (NIRREF)meta.bibcharMSMBHSupermassive black hole mass (MSMBH) (4)1e+10solMassphys.massdoublee_MSMBHLower error 1 sigma of MSMBH (EMSMBHL)1e+10solMassstat.errordoubleE_MSMBHUpper error 1 sigma of MSMBH (EMSMBHH)1e+10solMassstat.error;stat.maxdoubler_zQSOReference of the adopted redshift data (REDSHIFT_REF)meta.ref;pos.framechar1450MagAbsolute magnitude at 1450 angstrom (M1450)magphys.magAbsdoubleF2500Rest frame monochromatic flux at 2500 angstrom (F2500)1e-28mW.m**-2.Hz**-1phot.flux.densitydoubleL2500Rest frame monochromatic luminosity at 2502 angstrom (LNUR2500)1e+25W.Hz**-1phys.luminositydoubleNCtSoftBackground subtracted net counts number in 0.5-2 keV (NETCTSSOFT)ctphot.count;em.X-ray.softdoubleNCtHardBackground subtracted net counts number in 2-7 keV (NETCTSHARD)ctphot.count;em.X-ray.mediumdoubleNCtFullBackground subtracted net counts number in 0.5-7 keV (NETCTSFULL)ctphot.count;em.X-ray.mediumdoubles_NCtSoft1 sigma background rms in 0.5-2 keV (SIGMASOFT)ctstat.stdev;instr.background;em.X-ray.softdoubles_NCtHard1 sigma background rms in 2-7 keV (SIGMAHARD)ctstat.stdev;instr.background;em.X-ray.mediumdoubles_NCtFull1 sigma background rms in 0.5-7 keV (SIGMAFULL)ctstat.stdev;instr.background;em.X-ray.mediumdoubleS/NSoftSignal-to-noise ratio of the QSO in 0.5-2 keV (QSOSNRSOFT)stat.snrdoubleS/NHardSignal-to-noise ratio of the QSO in 2-7 keV (QSOSNRHARD)stat.snrdoubleS/NFullSignal-to-noise ratio of the QSO in 0.5-7 keV (QSOSNRFULL)stat.snrdoubleLXObservational frame 0.5-2 keV luminosity (LX)1e+37Wphys.luminosity;em.X-raydoublee_LXLower error 1 sigma of LX (ELXL)1e+37Wstat.errordoubleE_LXUpper error 1 sigma of LX (ELXH)1e+37Wstat.error;stat.maxdoubleF2kevRest frame monochromatic flux at 2 keV (F2KEV)1e-33mW.m**-2.Hz**-1phot.flux;em.X-raydoublee_F2kevLower error 1 sigma of F2kev (EF2KEVL)1e-33mW.m**-2.Hz**-1stat.errordoubleE_F2kevUpper error 1 sigma of F2kev (EF2KEVH)1e-33mW.m**-2.Hz**-1stat.error;stat.maxdoubleFXObservational frame 0.5-2 keV flux (FX)1e-14mW.m**-2phot.flux;em.X-raydoublee_FXLower error 1 sigma of FX (EFXL)1e-14mW.m**-2stat.errordoubleE_FXUpper error 1 sigma of FX (EFXH)1e-14mW.m**-2stat.error;stat.maxdoubleLXRestRest frame 2-10 keV luminosity (LXREST)1e+37Wphys.luminosity;em.X-raydoublee_LXRestLower error 1 sigma of LXRest (ELXRESTL)1e+37Wstat.errordoubleE_LXRestUpper error 1 sigma of LXRest (ELXRESTH)1e+37Wstat.error;stat.maxdoubleFXRestRest frame 2-10 keV flux (FXREST)1e-14mW.m**-2phot.flux;em.X-raydoublee_FXRestLower error 1 sigma of FXRest (EFXRESTL)1e-14mW.m**-2stat.errordoubleE_FXRestUpper error 1 sigma of FXRest (EFXRESTH)1e-14mW.m**-2stat.error;stat.maxdoubleGammaPhoton index Gamma of the power-law spectral fit in X-ray band (PHOINDEX) (3)instr.bandwidth;meta.modelleddoublee_GammaLower error 1 sigma of Gamma (EPHOINDEXL)stat.errordoubleE_GammaUpper error 1 sigma of Gamma (EPHOINDEXH)stat.error;stat.maxdoublealphaOXOptical-to-X-ray spectral slope (ALPHAOX)spect.indexdoublelambdaEdEddington ratio of the SMBH (LAMBDAEDD) (4)phys.luminosity;arith.ratiodoublee_lambdaEdLower error 1 sigma of lambdaEdd (ELAMBDAEDDL)stat.errordoubleE_lambdaEdUpper error 1 sigma of lambdaEdd (ELAMBDAEDDH)stat.error;stat.maxdoubleNoteAdditional special notes on individual QSOs (NOTE)meta.notecharFRadioIntegrated 20 cm radio flux (RADIOFLUX)mJyphot.flux.density;em.radio.750-1500MHzdoubleDRadioSeparation of the radio position from the optical position (RADIODIST)arcsecpos.angDistancedoubleQSOName of the QSO in the format of Jhhmmss ddmmss (QSO) (1)meta.id;meta.mainchar