J/MNRAS/249/218ivo://CDS.VizieR/J/MNRAS/249/218doi:10.26093/cds/vizier.72490218CDSClowes R.G.Campusano L.E.2013-03-04T07:05:38Z1997-12-09T21:35:21ZCDS support team

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

cds-question@unistra.frquasarsredshiftedWe have found evidence for a large, elongated group of at least ten quasars with largest dimension ~100-200h-1Mpc at z~1.3, in the direction of ESO/SERC field 927, which has the field centre (1950) 10h40m00s, 05deg00'00". There are probably further members that have not yet been observed. The morphology of the group seems to be like a clump, but there might be some sub-grouping on scales ~20h-1Mpc. The group is similar in size and number of quasars to that found by Crampton, Cowley & Hartwick (1989). The fact that two such groups are now known is evidence that the distribution of quasars is not so simple as was previously thought: at large scales (>10h-1Mpc) the majority of quasars may be distributed uniformly and at random, but rare, large groups also occur. The groups may be large physical structures, but a strong association with the large structures of galaxies seems doubtful.1991MNRAS.249..218Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/249/218CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/249/218https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/249/218http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/249/218https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/249/218https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/249/218http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/249/218GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/249/218/table1 (S and W bands of quasars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/249/218/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/249/218/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/249/218/table1?GETtext/xml+votable180.050000true158.4092142.5433890.005555555555555556Cone search capability for table J/MNRAS/249/218/table2 (Collation of redshifts data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/249/218/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/249/218/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/249/218/table2?GETtext/xml+votable180.050000true158.774986.0280190.0055555555555555565/6852 6853 6855 6/27065 27066 27067 27068 27071 27398 27399 27405 27417 27419 27441 27444 27446 27458 27459 27464 27465 27466https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/249/218?format=asciiOpticaldefaultJ/MNRAS/249/218/table1S and W bands of quasarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBand[SW] Band designation S= strong-lined, W=weak-linedmeta.notecharRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainLSPAutomated Quasar Detection (AQD) line-strength parameterspect.line.intensityfloatzRedshiftsrc.redshiftfloatn_z[k] Note on redshift (1)meta.notecharLineLinemeta.id;spect.linecharEW[]? Equivalent width0.1nmspect.line.eqWidthintnullableBj[]? Bj magnitudemagphot.mag;em.opt.Bfloatnullable_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/MNRAS/249/218/table2Collation of redshifts datazRedshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right Ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainBj[]? Bj magnitudemagphot.mag;em.opt.Bfloatnullable_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed