J/ApJ/914/130ivo://CDS.VizieR/J/ApJ/914/130doi:10.26093/cds/vizier.19140130CDSSnios B.Schwartz D.A.Siemiginowska A.Sobolewska M.Birkinshaw M.,Cheung C.C.Gobeille D.B.Marshall H.L.Migliori G.Wardle J.F.C.,Worrall D.M.2023-10-03T13:13:57Z2023-01-10T08:08:39ZCDS support team

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

cds-question@unistra.frquasarsredshiftedx-ray-sourcesradio-astronomyvisible-astronomyWe present Chandra X-ray observations of 14 radio-loud quasars at redshifts 3<z<4, selected from a well-defined sample. All quasars are detected in the 0.5-7.0keV energy band, and resolved X-ray features are detected in five of the objects at distances of 1"-12" from the quasar core. The X-ray features are spatially coincident with known radio features for four of the five quasars. This indicates that these systems contain X-ray jets. X-ray fluxes and luminosities are measured, and jet-to-core X-ray flux ratios are estimated. The flux ratios are consistent with those observed for nearby jet systems, suggesting that the observed X-ray emission mechanism is independent of redshift. For quasars with undetected jets, an upper limit on the average X-ray jet intensity is estimated using a stacked image analysis. Emission spectra of the quasar cores are extracted and modeled to obtain best-fit photon indices, and an Fe K emission line is detected from one quasar in our sample. We compare X-ray spectral properties with optical and radio emission in the context of both our sample and other quasar surveys.2021ApJ...914..130Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/914/130CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)VII/286 : SDSS quasar catalog, fourteenth data release (Paris+, 2018)VII/289 : SDSS quasar catalog, sixteenth data release (DR16Q) (Lyke+, 2020)J/ApJS/92/53 : Einstein database of quasars. I. (Wilkes+, 1994)J/ApJ/626/95 : Gamma-ray blazar candidates (Sowards-Emmerd+, 2005)J/ApJ/657/116 : X-ray and UV parameters of radio-quiet quasars (Kelly+, 2007)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/ApJ/819/62 : The COSMOS-Legacy Survey (CLS) catalog (Civano+, 2016)J/ApJ/819/154 : SDSS-DR7 QSOs with X-ray and UV luminosities (Lusso+, 2016)J/ApJS/249/17 : SDSS QSO DR14 spectral properties (Rakshit+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/914/130https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/914/130http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/914/130https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/914/130https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/914/130http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/914/130GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/914/130/quasars (Chandra observations (Table 1), VLA observations (Table 2) and optical properties (Table 6) of the quasar sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/914/130/quasars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/914/130/quasars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/914/130/quasars?GETtext/xml+votable180.050000true120.4070083347.424511110.0055555555555555566/4114 4263 4446 4947 6628 7709 8525 9334 10996 11418 26083 28369 31529 32410https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/914/130?format=asciiX-rayOpticalRadiodefaultJ/ApJ/914/130/quasarsChandra observations (Table 1), VLA observations (Table 2) and optical properties (Table 6) of the quasar samplemaxBeam[0.24/1.95] Beam maximumarcsecphys.angSize;instr.beamfloatQSOQuasar designation (JHHMM+DDMM)meta.id;meta.maincharprimarySimbadSimbad column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintz[3/3.81] Redshift measurements (1)src.redshiftfloatRAJ2000Hour of right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (2)pos.eq.dec;meta.mainObsID[20399/20412] Observation identifier (3)meta.id;obs.param;obsintDateDate of observation (UT)time.epochnullableExp[9/9.8] Total exposure time after flare removal reprocessing and dead time correctionkstime.duration;obs.exposurefloatlogMBH[8.53/9.99]? log of BH mass (4)log(solMass)phys.massfloatnullablee_logMBH[0.01/0.5]? logMBH uncertaintylog(solMass)stat.errorfloatnullablelogLbol[46.63/47.86]? Log of bolometric luminosity (4)log(1e-07W)phys.luminosityfloatnullablelogLEdd[-0.77/0.34]? Eddington ratios for the quasar samplephys.luminosity;arith.ratiofloatnullableExpVLA[259.2/580] VLA exposure timestime.duration;obs.exposurefloatFreq[1.4/6.2] Observed frequencyGHzem.freqfloatDateVLAVLA observation datetime.epochnullableminBeam[0.21/1.41] Beam minimumarcsecphys.angSize;instr.beamfloatPABeam[-61.4/72.3] Beam position angledegpos.posAng;instr.beamfloatInt[0.1/0.85] Minimum contour intensitymJy/beamphot.flux.density;em.radio.750-1500MHzfloatm1450[17.4/21.1] Rest-frame, monochromatic AB apparent magnitude at 1450{AA}, as measured from Pan-STARRS r band (5)magphot.magfloatL2500[2.3/54.7] Rest-frame, monochromatic luminosity at 2500{AA}, in units of 10^31^erg/s/Hz1e+24W.Hz**-1phys.luminosity;arith.ratiofloataOX[-1.86/-1.25] Optical-to-X-ray power-law slopespect.indexfloate_aOX[0.03/0.14] Lower uncertainty on aOX (6)stat.errorfloatE_aOX[0.03/0.13] Upper uncertainty on aOX (6)stat.error;stat.maxfloatJ/ApJ/914/130/table4X-ray morphological analysis of quasar samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSec[1/12] Annulus sectorobs.fieldintInner[1/1.7] Inner annular radius of sectorarcsecphys.angSize;srcfloatOuter[2/11] Outer annular radius of sectorarcsecphys.angSize;srcfloatOCts[0/12] Observed 0.5-7.0keV counts in sectorctphot.count;em.X-rayintPCts[0.14/6.1] Mean 0.5-7.0keV counts from simulated PSF in sectorctphot.count;em.X-ray;stat.meanfloatBCts[0.02/0.6] 0.5-7.0keV counts from field background in sectorctphot.count;em.X-rayfloatProb[0/1] Cumulative Poisson probability of detecting counts greater than observed counts (1)phot.countfloatQSOQuasar identifier (JHHMM+DDMM)meta.id;meta.maincharprimary