J/MNRAS/390/1437ivo://CDS.VizieR/J/MNRAS/390/1437doi:10.26093/cds/vizier.73901437CDSChapman S.C.Ibata R.Irwin M.Koch A.Letarte B.Martin N.,Collins M.Lewis G.F.McConnachie A.Penarrubia J.Rich R.M.,Trethewey D.Ferguson A.Huxor A.Tanvir N.2024-07-07T20:17:02Z2011-06-07T08:02:47ZCDS support team

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

cds-question@unistra.frmetallicityradial-velocityinfrared-photometryvisible-astronomyphotometrygalaxiesspectroscopyWe present a spectroscopic analysis of five stellar streams ("A", "B", "Cr", "Cp" and "D") as well as the extended star cluster, EC4, which lies within Stream "C", all discovered in the halo of M31 from our Canada-France-Hawaii Telescope/MegaCam survey. These spectroscopic results were initially serendipitous, making use of our existing observations from the DEep Imaging Multi-Object Spectrograph mounted on the Keck II telescope, and thereby emphasizing the ubiquity of tidal streams that account for ~70 per cent of the M31 halo stars in the targeted fields. Subsequent spectroscopy was then procured in Stream "C" and Stream "D" to trace the velocity gradient along the streams. Nine metal-rich ([Fe/H]~-0.7) stars at v_hel_=-349.5km/s, {sigma}_v,corr_~5.1+/-2.5km/s are proposed as a serendipitous detection of Stream "Cr", with follow-up kinematic identification at a further point along the stream. Seven metal-poor ([Fe/H]~-1.3) stars confined to a narrow, 15km/s velocity bin centred at v_hel_=-285.6, {sigma}_v,corr_=4.3^+1.7^_-1.4_km/s represent a kinematic detection of Stream "Cp", again with follow-up kinematic identification further along the stream. For the cluster EC4, candidate member stars with average [Fe/H]~-1.4, are found at v_hel_=-282 suggesting it could be related to Stream "Cp". No similarly obvious cold kinematic candidate is found for Stream "D", although candidates are proposed in both of two spectroscopic pointings along the stream (both at ~-400km/s). Spectroscopy near the edge of Stream "B" suggests a likely kinematic detection at v_hel_~-330, {sigma}_v,corr_~6.9km/s, while a candidate kinematic detection of Stream "A" is found (plausibly associated to M33 rather than M31) with v_hel_~-170, {sigma}_v,corr_=12.5km/s. The low dispersion of the streams in kinematics, physical thickness and metallicity makes it hard to reconcile with a scenario whereby these stream structures as an ensemble are related to the giant southern stream. We conclude that the M31 stellar halo is largely made up of multiple kinematically cold streams.2008MNRAS.390.1437Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/390/1437CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/112/491 : Late-Type Stars in M31. II. (Brewer+ 1996)J/AJ/124/234 : M31 outer halo UBVRI photometry and metallicity (Reitzel+,J/AJ/127/2738 : ACS VI photometry of M31 halo RR Lyrea (Brown+, 2004)J/MNRAS/369/120 : Kinematic survey of planetary nebulae in M31 (Merrett+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/390/1437https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/390/1437http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/390/1437https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/390/1437https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/390/1437http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/390/1437GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/390/1437/table1 (Properties of DEIMOS fields in the M31 stellar streams "A","B","C" and "D".)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/390/1437/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/390/1437/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/390/1437/table1?GETtext/xml+votable180.050000true18.505708332.51691670.005555555555555556Cone search capability for table J/MNRAS/390/1437/stars (Properties of candidate M31 halo stars in fields F7 (table 2), F37 (table 3), F25/26 (table 4), F36 (table 5), M6 (table 6) and M8 (table 7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/390/1437/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/390/1437/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/390/1437/stars?GETtext/xml+votable180.050000true13.575083339.72566670.0055555555555555566/2228 2246 2284 2591 2625 2627 2634 2656-26582.367228618189496e-19 3.9105737390043815e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/390/1437?format=asciiOpticalInfrareddefaultJ/MNRAS/390/1437/table1Properties of DEIMOS fields in the M31 stellar streams "A","B","C" and "D".recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStrStream designation (added by CDS)meta.id;meta.maincharprimaryStreamTarget namemeta.idcharFieldField designationmeta.idcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainHRVStream radial velocitykm/sspect.dopplerVelocfloatu_sigma[~ ] Uncertainty flag on sigmameta.code.errorcharsigma? Velocity dispersion (1)km/sphys.veloc.dispersionfloatnullableE_sigma? Positive uncertainty on sigmakm/sstat.error;stat.maxfloatnullablee_sigma? Negative uncertainty on sigmakm/sstat.errorfloatnullable[Fe/H]Mean [Fe/H] (2)phys.abund.Fe;stat.meanfloate_[Fe/H]Uncertainty in [Fe/H]stat.error;phys.abund.Fefloat[Fe/H]p? Statistical photometric [Fe/H] from Ibata et al., 2007ApJ...671.1591Iphys.abund.FefloatnullableFWHM? Stream width (3)kpcphys.size.radiusfloatnullableRperi? R_peri_ model parameter (4)kpcphys.size.radiusintnullableMstr? Structural estimation of stream mass (5)1e+07solMassphys.massintnullableMsv? Kinematical estimation of stream mass (5)1e+07solMassphys.massintnullableLstr? Stream luminosity (6)1e+06solLumphys.luminosityfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharJ/MNRAS/390/1437/starsProperties of candidate M31 halo stars in fields F7 (table 2), F37 (table 3), F25/26 (table 4), F36 (table 5), M6 (table 6) and M8 (table 7)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStrStream designation, as in table1meta.id.parentcharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVHRV uncertaintykm/sstat.errorfloat[Fe/H]p? Photometric [Fe/H]phys.abund.Fefloatnullable[Fe/H]? Spectroscopic [Fe/H] calculated from the CaII triplet lines equivalent widthlog(Sun)phys.abund.FefloatnullableVmagV-band magnitude (Johnson-Cousins)magphot.mag;em.opt.VfloatImagI-band magnitude (Johnson-Cousins)magphot.mag;em.opt.IfloatDist? Distance from the centre of EC4 (only for table 4) (1)arcminpos.angDistancefloatnullable