J/ApJS/175/29ivo://CDS.VizieR/J/ApJS/175/29doi:10.26093/cds/vizier.21750029CDSMarble A.R.Eriksen K.A.Impey C.D.Bai L.Miller L.2017-11-29T11:49:07Z2010-03-15T15:34:16ZCDS support team

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

cds-question@unistra.frquasarsspectroscopyredshiftedThe Ly{alpha} forest has opened a new redshift regime for cosmological investigation. At z>2 it provides a unique probe of cosmic geometry and an independent constraint on dark energy that is not subject to standard candle or ruler assumptions. In Paper I of this series on using the Ly{alpha} forest observed in pairs of QSOs for a new application of the Alcock-Paczynski test, we present and discuss the results of a campaign to obtain moderate-resolution spectroscopy (FWHM~2.5{AA}) of the Ly{alpha} forest in pairs of QSOs with small redshift differences ({Delta}z<0.25, z>2.2) and arcminute separations ({Theta}<5'). This data set, composed of seven individual QSOs, 35 pairs, and one triplet, is also well suited for future investigations of the coherence of Ly{alpha} absorbers on ~1Mpc transverse scales and the transverse proximity effect. We note seven revisions for previously published QSO identifications and/or redshifts.2008ApJS..175...29Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/175/29CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/248 : Quasars and Active Galactic Nuclei (12th Ed.) (Veron+ 2006)VII/241 : The 2dF QSO Redshift Survey (Croom+ 2004)VII/252 : SDSS-DR5 quasar catalog (Schneider+, 2007)II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007)J/A+A/296/665 : Survey of optically variables QSOs (Veron+, 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/175/29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/175/29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/175/29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/175/29https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/175/29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/175/29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/175/29/table2 (Sample QSOs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/175/29/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/175/29/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/175/29/table2?GETtext/xml+votable180.050000true2.219625-29.012250.005555555555555556Cone search capability for table J/ApJS/175/29/table4 (QSO catalog corrections)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/175/29/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/175/29/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/175/29/table4?GETtext/xml+votable180.050000true27.6983333-42.62777780.0055555555555555566/6192 6517 9272 16494 16533 16535 16552 16556 16557 16570 16654 18804 18860 25849 25852 25924 25990 26007 26020 26028 26182 26253 26273 26876 27025 27214 27235 27393 33635 33645 35215 35512 35729 35770 35779 35939 35993 36010 36040 46649 46651 46940 46953 46956 46957 47022https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/175/29?format=asciiOpticaldefaultJ/ApJS/175/29/refsTable 2 referencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharJ/ApJS/175/29/table2Sample QSOsn_z[f] Flag on redshift (3)meta.notecharr_z? Redshift referencemeta.ref;pos.frameintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MEI2008]QSO numbermeta.id;meta.mainintprimaryn_[MEI2008][pts] pair, triplet or single QSO(s)meta.notechartheta? QSO pair separationarcminpos.angDistancefloatnullablef_theta[bcde ] Flag on Theta (2)meta.codecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainr_posReference for positionmeta.ref;pos.frameintz? redshift (spectroscopic)src.redshiftfloatnullablemag? Apparent magnitude in n_mag bandphot.magfloatnullablen_magFilter of magnitudemeta.code;instr.filtercharr_mag? Magnitude reference (4)meta.refintnullableObsDate? Observation datetime.epoch;obsnullableDay2Second day of observationtime.epochcharTelTelescope usedinstr.setupcharFWHM? Spectral resolution FWHM0.1nmspect.line.widthfloatnullableS/N? Mean Signal/Noise ratio per pixel (5)stat.snr;stat.meanintnullableONamePreviously published QSO designationmeta.idcharr_OName? Alias referencemeta.ref;pos.frameintnullableSimbadNameSimbad column added by the CDSmeta.idcharcSimbad column added by the CDSmeta.ref.urlcharJ/ApJS/175/29/table4QSO catalog correctionse_z? Error on zstat.error;src.redshiftfloatnullablez? Revised redshiftsrc.redshiftfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[MEI2008]QSO numbermeta.id;meta.mainintRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainr_posReference for position (1)meta.ref;pos.frameintzprevPreviously published incorrect redshiftsrc.redshiftfloatr_zprev? zprev reference (1)meta.ref;pos.frameintnullablezprev2? Other previously published incorrect zsrc.redshiftfloatnullabler_zprev2? zprev2 reference (1)meta.ref;pos.frameintnullablef_z[b] 'b' if object is not a QSOmeta.codecharEmEmission lines used for redshift determination (3)meta.id;spect.linecharONamePreviously published QSO designationmeta.idcharr_ONameAlias reference (1)meta.ref;pos.frameint