J/AJ/136/181ivo://CDS.VizieR/J/AJ/136/181doi:10.26093/cds/vizier.51360181CDSCasey C.M.Impey C.D.Petry C.E.Marble A.R.Dave R.2017-06-20T13:17:35Z2011-02-14T13:13:02ZCDS support team

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

cds-question@unistra.frquasarsspectroscopyline-intensitiesredshiftedThis is the first measurement and detection of coherence in the intergalactic medium (IGM) at substantially high redshift (z~3.8) and on large physical scales (~2.5h^-1^_70_Mpc). We perform the measurement by presenting new observations of the high-redshift quasar pair PC 1643+4631A, B and their Ly{alpha}-absorber coincidences. With data collected from Keck I Low Resolution Imaging Spectrometer (LRIS) in a 10200s integration, we have full coverage of the Ly{alpha} forest over the redshift range 2.6<z<3.8 at a resolution of 3.6{AA} (~220km/s).2008AJ....136..181Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/136/181CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/136/181https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/136/181http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/136/181https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/136/181https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/136/181http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/136/181GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/136/181/linesAbsorption linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCompSimbad column added by the CDSmeta.code.multipcharLineLine identification numbermeta.id;spect.lineintlambdaCentral wavelength in Angstroms ({AA})0.1nmem.wl.centralfloate_lambdaUncertainty in lambda in Angstroms ({AA})0.1nmstat.errorfloatWobsEquivalent width in Angstroms ({AA})0.1nmspect.line.eqWidthfloate_WobsUncertainty in Wobs in Angstroms ({AA})0.1nmstat.errorfloatchiReduced {chi}^2^ value (1)stat.fit.chi2floatSfitEquivalent width significance (2)stat.fit.goodnessfloatSdetDetection limit significance (3)stat.fit.goodnessfloatz? Redshift of absorbersrc.redshiftfloatnullablef_z[a-f ,] Flag on line (4)meta.codecharn_zNotes on linemeta.noteJ/AJ/136/181/table4Symmetrically matched Ly{alpha} linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMatchSymmetrically matched pair numbermeta.idintAlambdaWavelength in spectrum A (in {AA})0.1nmem.wlfloatBlambdaWavelength in spectrum B (in {AA})0.1nmem.wlfloatDlambdaWavelength separation of pair (in {AA})0.1nmem.wl;arith.difffloatdVelVelocity difference of pairkm/sphys.veloc;arith.difffloatW0ARest equivalent width in spectrum A (in {AA})0.1nmspect.line.eqWidthfloatW0BRest equivalent width in spectrum B (in {AA})0.1nmspect.line.eqWidth;em.opt.BfloatdW0Difference in rest equivalent widths (in {AA})0.1nmspect.line.eqWidth;arith.difffloat