J/MNRAS/490/2905ivo://CDS.VizieR/J/MNRAS/490/2905doi:10.26093/cds/vizier.74902905CDSPreston J.Collins M.L.M.Ibata R.A.Tollerud E.J.Rich R.M.,Bonaca A.McConnachie A.W.Mackey D.Lewis G.F.Martin N.F.,Penarrubia J.Chapman S.C.Delorme M.2024-08-20T20:13:49Z2023-03-21T13:47:17ZCDS support team

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

cds-question@unistra.frgiant-starsgalaxiesradial-velocityphotometryspectroscopyvisible-astronomyWe present a kinematic and spectroscopic analysis of 38 red giant branch stars, in seven fields, spanning the dwarf spheroidal galaxy Andromeda XXVII and the upper segment of the North West Stream. Both features are located in the outer halo of the Andromeda galaxy at a projected radius of 50-80kpc, with the stream extending for ~3{deg} on the sky. Our data are obtained as part of the PAndAS survey and enables us to confirm that Andromeda XXVII's heliocentric distance is 827+/-47kpc and spectroscopic metallicity is -2.1^+0.4^_-0.5_. We also re-derive Andromeda XXVII's kinematic properties, measuring a systemic velocity =-526.1^+10.0^_-11.0_km/s and a velocity dispersion that we find to be non-Gaussian but for which we derive a formal value of 27.0^+2.2^_-3.9_km/s. In the upper segment of the North West Stream we measure mean values for the metallicity =-1.8+/-0.4, systemic velocity =-519.4+/-4.0km/s, and velocity dispersion =10.0+/-4.0km/s. We also detect a velocity gradient of 1.7+/-0.3km/s/kpc on an infall trajectory towards M31. With a similar gradient, acting in the same direction, in the lower segment we suggest that the North West Stream is not a single structure. As the properties of the upper segment of the North West Stream and Andromeda XXVII are consistent within 90 per cent confidence limits, it is likely that the two are related and plausible that Andromeda XXVII is the progenitor of this stream.2019MNRAS.490.2905Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/2905CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/2905https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/2905http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/2905https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/490/2905https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/490/2905http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/490/2905GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/490/2905/tablea1 (Properties of observed stars from the masks)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/2905/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/2905/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/2905/tablea1?GETtext/xml+votable180.050000true9.39487545.38183330.0055555555555555566/2758 2764 2766https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/490/2905?format=asciiOpticaldefaultJ/MNRAS/490/2905/tablea1Properties of observed stars from the masksrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMaskMask used for the observationinstr.setupcharIDInternal object identifiermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainimagCFHT MegaCam i-band magnitudemagphot.mag;em.opt.IfloatgmagCFHT MegaCam g-band magnitudemagphot.mag;em.opt.BfloatS/NSinal to noise ratio10nm**-1stat.snr;instr.det.noisefloatvLOSLine of sight velocitykm/sphys.veloc;pos.heliocentricfloate_vLOSError on vLOSkm/sstat.errorfloatLocLocation of the star (And XXVII or NW-K1)meta.id.parentchar