J/MNRAS/480/4302ivo://CDS.VizieR/J/MNRAS/480/4302doi:10.26093/cds/vizier.74804302CDSCoronado J.Sepulveda M.P.Gould A.Chaname J.2024-08-18T20:21:21Z2022-06-29T12:27:13ZCDS support team

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

cds-question@unistra.frmultiple-starsastrometryradial-velocityproper-motionsvisible-astronomySamples of reliably identified halo wide binaries are scarce. If reasonably free from selection effects and with a small degree of contamination by chance alignments, these wide binaries become a powerful dynamical tool, having provided one of the very few experiments capable of constraining the nature of dark matter in the Milky Way halo. Currently, however, the best available sample of halo wide binaries is confined to the solar neighbourhood, and is plagued by small number statistics at the widest separations. We present the results of a programme aimed to probe the wide binary population of the Galactic halo at significantly larger distances, and which informs future searches that could improve the statistics by orders of magnitude. Halo stars were taken from the Sloan Digital Sky Survey after analysing the Galactic orbits of stars in the reduced proper motion diagram. We then select candidate binaries by searching for pairs with small differences in proper motion and small projected separation on the sky. Using medium-resolution spectroscopy, a subsample of candidates is validated via radial velocities, finding that about 68 per cent of candidate pairs up to 20arcsec separation can be considered genuine halo wide binaries, to the limits of the available data. Precise parallaxes from Gaia confirm that most of our selected pairs have their components at the same distances, independently confirming the robustness of our selection method. These results should prove valuable to guide the optimal assembly of larger catalogues of halo wide binaries from upcoming large databases, e.g. Gaia and LSST.2018MNRAS.480.4302Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/480/4302CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/480/4302https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/480/4302http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/480/4302https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/480/4302https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/480/4302http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/480/4302GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/480/4302/tablec1 (Catalog of halo wide binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/4302/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/4302/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/4302/tablec1?GETtext/xml+votable180.050000true145.962165197.553821640.0055555555555555566/121 4631 4838 5263 8226 8249 8291-8292 8400 8469 8476 8531 8644 8679 8713 8738 8754 8836 9077 9810 12303 12351 12370 12523 14376 18683 18849 18862 21861 21955 22354 22714 23628 24338 25724 25852 26041 26043 26097 26115 26325 26368 26377 26494 26876 27388 27429 27479 27711 27914 27990 28101 28148 28288 29426 29428 30056 30116 30552 30803 30938 31315 31342 31373 31441 31470 31608 31624 31653 31655 31704 31751 31759 31769 31800 31873 32122 36531 36535 36644 44410 44517 48937 49005-49006https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/480/4302?format=asciiOpticaldefaultJ/MNRAS/480/4302/tablec1Catalog of halo wide binariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier for each starmeta.id;meta.mainintRAJ2000Right ascension of star 1 (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of star 1 (J2000)degpos.eq.dec;meta.mainRA2degRight ascension of star 2 (J2000)degpos.eq.raDE2degDeclination of star 2 (J2000)degpos.eq.decpmGLON1Proper motion in galactic longitude star 1mas/yrpos.pmdoublepmGLON2Proper motion in galactic longitude star 2mas/yrpos.pmdoublepmGLAT1Proper motion in galactic latitude star 1mas/yrpos.pmdoublepmGLAT2Proper motion in galactic latitude star 2mas/yrpos.pmdoublermag1PSF magnitude in the r band star 1magphot.mag;em.opt.Rdoublermag2PSF magnitude in the r band star 2magphot.mag;em.opt.RdoubleSepAngular separation of the pairarcsecpos.angDistancedoubleRV1Radial velocity of star 1km/sspect.dopplerVelocfloate_RV1Error on RV1km/sstat.errorfloatRV2Radial velocity of star 2km/sspect.dopplerVelocfloate_RV2Error on RV2km/sstat.errorfloat