Quasars as standard candles. III. J/A+A/642/A150 ivo://CDS.VizieR/J/A+A/642/A150 doi:10.26093/cds/vizier.36420150 CDS Lusso E. Risaliti G. Nardini E. Bargiacchi G. Benetti M. Bisogni S.,Capozziello S. Civano F. Eggleston L. Elvis M. Fabbiano G. Gilli R.,Marconi A. Paolillo M. Piedipalumbo E. Salvestrini F. Signorini M.,Vignali C. 2021-09-08T12:18:35Z 2020-10-13T10:39:05Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr quasars active-galactic-nuclei redshifted x-ray-sources ultraviolet-astronomy visible-astronomy stellar-distance We present a new catalogue of ~2400 optically selected quasars with spectroscopic redshifts and X-ray observations from either Chandra or XMM-Newton. The sample can be used to investigate the non-linear relation between the UV and X-ray luminosity of quasars, and to build a Hubble diagram up to redshift z~7.5. We selected sources that are neither reddened by dust in the optical/UV nor obscured by gas in the X-rays, and whose X-ray fluxes are free from flux-limit related biases. After checking for any possible systematics, we confirm, in agreement with our previous works, that (i) the X-ray to UV relation provides distance estimates matching those from supernovae up to z~1.5, and (ii) its slope shows no redshift evolution up to z~5. We provide a full description of the methodology for testing cosmological models, further supporting a trend whereby the Hubble diagram of quasars is well reproduced by the standard flat LambdaCDM model up to z~1.5-2, but strong deviations emerge at higher redshifts. Since we have minimized all non-negligible systematic effects, and proven the stability of the Lx-Lo relation at high redshifts, we conclude that an evolution of the expansion rate of the Universe should be considered as a possible explanation for the observed deviation, rather than some systematic (redshift-dependent) effect associated with high-redshift quasars. 2020A&A...642A.150L https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/642/A150 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/642/A150 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/642/A150 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/642/A150 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/642/A150 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/642/A150 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/642/A150 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/642/A150/table3 (Properties of the final quasar sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/642/A150/table3? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/642/A150/table3? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/642/A150/table3? 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27941 27944 27950-27951 27963 27975 27982 28022 28029 28032-28034 28037 28045 28050 28086 28126-28127 28138 28141-28143 28147-28149 28151 28174 28184 28188 28221 28223 28226 28234 28251 28271 28275 28278 28284 28344 28346 28351 28356-28357 28389 28393 28397 28414-28415 28427 28430 28448 28452 28466 28471 28478 28483 28490 28492 28497 28516-28517 28522 28535 28538-28539 28541 28548 28555 28570 28574 28583 28592 28594 28610-28611 28621 28631-28632 28639 28648 30033 30040 31310 31313 31396-31397 31399 31403 31406 31430 31453 31463 31465 31621 31625 31629 31662 31668 31712 31725 32422 32500 34881 35615 36728 36764-36766 36777 36785-36786 36792 36794 36803-36804 36846 36861 36863 37650 44463 45044 45054 47169 49009 49042 49106 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/642/A150?format=ascii X-ray UV Optical default J/A+A/642/A150/table3 Properties of the final quasar sample SimbadName Simbad column added by the CDS meta.id char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Quasar name meta.id;meta.main char RAJ2000 Right ascension (J2000.0) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000.0) deg pos.eq.dec;meta.main z Redshift src.redshift float logFUV Rest-frame fluxes at 2500 Angstroem (1) log(mW.m**-2) phot.flux;em.UV double e_logFUV Error on rest-frame fluxes at 2500 Angstroem log(mW.m**-2) stat.error double logFX Rest-frame fluxes at 2keV (1) log(mW.m**-2) phot.flux;em.X-ray double e_logFX Error on rest-frame fluxes at 2keV log(mW.m**-2) stat.error double Group [1/7] Group numbering for each sub-sample (2) meta.id int gammax Photon index spect.index double e_gammax Error on the photon index stat.error double DM Distance modulus (3) phot.mag.distMod double e_DM Error on the distance modulus stat.error double