J/A+A/660/A16ivo://CDS.VizieR/J/A+A/660/A16doi:10.26093/cds/vizier.36600016CDSSouchay J.Secrest N.Lambert S.Zacharias N.Taris F.Barache C.,Arias F.Makarov V.2022-11-13T16:37:26Z2022-03-31T09:05:37ZCDS support team

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

cds-question@unistra.frquasarsproper-motionsvisible-astronomyThanks to the cross-identification between the Gaia EDR3 (E-Data Release 3) catalogue and the quasars' compiled catalogue LQAC-5 (Large Quasar Astrometric Catalogue-5), accurate astrometric parameters as well as photometric measurements were available for a set of 416113 quasars. After analysing the astrometric and photometric properties of these quasars,we concentrate our study on objects characterized by significant proper motion, which contradicts the postulate that they are fixed in the celestial sphere. We derived statistical properties of the positions, parallaxes, and proper motions of the quasars cross-matched with Gaia EDR3. We carried out a specific investigation of quasars with a proper motion larger than 10mas/y, and used colour-colour diagrams in mid-infrared to discriminate these quasars from stellar contamination. We discuss, in detail, a few cases where the abnormal proper motion could be caused by misidentifications. We note that 43% of LQAC-5 quasars were not detected by Gaia EDR3, mainly because of the cut-off magnitude at G=21. The comparison between r(G) (Gaia) and r (SDSS) shows a normal distribution. The normalized distributions of parallaxes and proper motions are identical to that of the Gaia CRF2, as well as the distribution of the GBP-GRP colour index. We have identified 937 LQAC-5 objects (0.27% of the sample) with Gaia EDR3 proper motion which is significant at the 5{sigma} level. We have clearly shown that below z=0.35, the integrated magnitude G(r) obtained from SDSS spectra is smaller than G (Gaia), leading to the statement that the quasars are generally resolved under this threshold, which should lead to a bad determination of proper motion. Moreover, to discriminate quasars from stellar contamination, we have plotted them in a mid-infrared colour-colour diagram. Finally, we have made a final selection of 41 objects with {mu}>10mas/y, satisfying drastic constraints, which makes them potential candidates for considering their proper motion as real. In this paper we carried out a complete analysis of the quasars of the LQAC-5 which were cross-identified with Gaia EDR3 ; this serves as an alternative and complementary study with respect to Gaia CRF2, involving a different population of quasars. We selected a set of 41 quasars with a proper motion exceeding 10 mas/y, which can be considered as very high for objects which are a priori fixed in the celestial sphere.2022A&A...660A..16Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/660/A16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/A+A/624/A145 : Astrometric Catalogue 5, LQAC-5 (Souchay+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/660/A16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/660/A16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/660/A16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/660/A16https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/660/A16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/660/A16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/660/A16/tablea1 (the 41 LQAC-5 quasars selected from Gaia EDR3 data with {mu}>10mas/yr, {chi}_{mu}_>5, {pi}/{sigma}_{pi}_<4 and located in the quasars central zone)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/660/A16/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/660/A16/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/660/A16/tablea1?GETtext/xml+votable180.050000true13.11195229270.59409300080.0055555555555555566/5643 7171 8701 8765 9742 9790 9992 10445 10521 10940 10960 11041 11294 17558 17761 18027 20190 25941 25959 25982 26032 26572 26597 27273 30036 31450 31708 32431 33635 35248 35594 35616 35619 35627 37290 47005 48455 48460 48496 48502 489671.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/660/A16?format=asciiOpticaldefaultJ/A+A/660/A16/tablea1the 41 LQAC-5 quasars selected from Gaia EDR3 data with {mu}>10mas/yr, {chi}_{mu}_>5, {pi}/{sigma}_{pi}_<4 and located in the quasars central zonerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference for cross-identification (1)meta.ref;pos.framecharRA_ICRSGaia EDR3 right ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.maine_RA_ICRSRigth ascension errormasstat.error;pos.eq.rafloatDE_ICRSGaia EDR3 declination (ICRS) at Ep=2016.0degpos.eq.dec;meta.maine_DE_ICRSDeclination errormasstat.error;pos.eq.decfloatz? Redshiftsrc.redshiftfloatnullableplxParallaxmaspos.parallax.trigfloate_plxParallax errormasstat.error;pos.parallaxfloatpmTotal proper motionmas/yrpos.pmfloate_pmTotal proper motion errormas/yrstat.errorfloatNNumber of observations in Gaia EDR3meta.numberintGmagGaia G magnitudemagphot.mag;em.optfloatP1Gaia EDR3 ASTROMETRIC-GOF-AL parameterstat.fit.goodnessfloatP2Gaia EDR3 ASTROMETRIC-EXCESS-NOISE parametermasstat.valuefloatdouble? Angular distance between the 6 detected Gaia EDR3 binary componentsmasmeta.code.multip;pos.angDistanceintnullableGaiaEDR3Display the Gaia EDR3 data (Gaia Collaboration, 2020, Cat. I/350)meta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2016. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2016. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed