J/PAZh/45/464ivo://CDS.VizieR/J/PAZh/45/464CDSKhorunzhev G.A.Burenin R.A.Sazonov S.Yu.Amvrosov A.Eselevich M.V..Zaznobin I.A.2021-08-26T06:53:08Z2020-11-26T07:31:56ZCDS support team

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

cds-question@unistra.frquasarsvisible-astronomyspectroscopyredshiftedWe present the results of optical spectroscopy for 58 quasar candidates at photometric redshifts z>~3, 57 of which enter into the Khorunzhev et al. (2016, Cat. J/PAZh/42/313) catalog (K16). This is a catalog of quasar candidates and known type 1 quasars selected among the X-ray sources of the 3XMM-DR4 catalog of the XMM-Newton serendipitous survey. At first we have performed spectroscopy for a quasi-random sample of 19 candidates at the 1.6-m AZT-33IK telescope of the Sayan Solar Observatory and the 6-m BTA telescope of the Special Astrophysical Observatory (SAO RAS). Then we have continued the observation for 39 X-ray bright candidates that could be used for the X-ray luminosity function construction (see Khorunzhev et al. 2018AstL...44..500K). The spectra at AZT-33IK were taken with the new low- and medium-resolution ADAM spectrograph that was produced and installed on the telescope in 2015. One of the most distant (z=5.08) optically bright (i=21) quasars ever detected in X-ray surveys has been discovered.2019PAZh...45..464Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PAZh/45/464CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/44 : XMM-Newton Serend. Source Catalogue 3XMM-DR4 (XMM-SSC, 2013)IX/55 : XMM-Newton Serend. Source Catalogue 3XMM-DR8 (XMM-SSC, 2018)VII/273 : The Half Million Quasars (HMQ) catalogue (Flesch, 2015)J/PAZh/42/313 : 3XMM-DR4 QSO candidates at 3<z<5.5 (Khorunzhev+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PAZh/45/464https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PAZh/45/464http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PAZh/45/464https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PAZh/45/464https://vizier.iucaa.in/viz-bin/votable?-source=J/PAZh/45/464http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PAZh/45/464GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PAZh/45/464/table1 (Quasar catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PAZh/45/464/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/PAZh/45/464/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PAZh/45/464/table1?GETtext/xml+votable180.050000true4.836916.5360.0055555555555555566/597 4488 4697 4859 4924 4946 6241 6252 7159 7441 7522 8266 8843 10153 10169 10190 10255 10386 10414 10472 10544 10630 10799 11080 11195 11217 11262 11694 11831 12405 12569 17662 17716 18968 19067 19849 20379 22890 26407 26997 27102 27767 27938 27941 28148 28396 28517 28540 30970 31121 31354 31398 31535 32424 40950 409562.381800341673347e-19 2.821731604724377e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PAZh/45/464?format=asciiOpticaldefaultJ/PAZh/45/464/table1Quasar catalogobjIDSDSS objIDmeta.idcharObs.DateObservation Date YYYY/MM/DDtime.epoch;obsnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName3XMM object name in 3XMM-DR4 (Cat. IX/44), JHHMMSS.s+DDMMSSmeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainFX05-2X-ray flux 0.5-2 keV band (in 10^-14^erg/s/cm^2^)10aW.m**-2phot.flux;em.X-ray.softfloatipmagSDSS PSF magnitude in i bandmagphot.mag;em.opt.IfloatzphPhotometric redshiftsrc.redshiftfloatInstInstrument of observation (1)instr;obscharEtimeN_exposure x time_of_exposurestime.expocharzsp? Spectroscopic redshift (2)src.redshiftfloatnullableQFQuality flag for object spectrum (3)meta.code.qualcharSloanDisplay the SDSS data for this objectmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar