J/A+A/666/A64ivo://CDS.VizieR/J/A+A/666/A64doi:10.26093/cds/vizier.36660064CDSRamos P.Antoja T.Yuan Z.Arentsen A.Oria P.-A.Famaey B.Ibata R.,Mateu C.Carballo-Bello J.A.2022-10-10T15:04:50Z2022-10-07T09:24:42ZCDS support team

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

cds-question@unistra.frgalaxiesstellar-populationsvisible-astronomyThe Sagittarius dwarf spheroidal (Sgr) is a dissolving galaxy being tidally disrupted by the Milky Way (MW). Its stellar stream still poses serious modelling challenges, which hinders our ability to use it effectively as a prospective probe of the MW gravitational potential at large radii. Our goal is to construct the largest and most stringent sample of stars in the stream with which we can advance our understanding of the Sgr-MW interaction, focusing on the characterisation of the bifurcations. We improved on previous methods based on the use of the wavelet transform to systematically search for the kinematic signature of the Sgr stream throughout the whole sky in the Gaia data. We then refined our selection via the use of a clustering algorithm on the statistical properties of the colour-magnitude diagrams. Our final sample contains more than 700000 candidate stars and is three times larger than previous Gaia samples. With it, we have been able to detect the bifurcation of the stream in both the northern and southern hemispheres, which requires four branches (two bright and two faint) to fully describe the system. We present the detailed proper motion distribution of the trailing arm as a function of the angular coordinate along the stream, showing, for the first time, the presence of a sharp edge (on the side of the small proper motions) beyond which there are no Sgr stars. We also characterise the correlation between kinematics and distance. Finally, the chemical analysis of our sample shows that the faint branch of the bifurcation is more metal poor than the bright. We provide analytical descriptions for the proper motion trends as well as for the sky distribution of the four branches of the stream. Based on our analysis, we interpret the bifurcations as a misaligned overlap of the material stripped at the antepenultimate pericentre (faint branches) with the stars ejected at the penultimate pericentre (bright branch), given that Sgr just went through its perigalacticon. The source of this misalignment is still unknown, but we argue that models with some internal rotation in the progenitor - at least during the time of stripping of the stars that are now in the faint branches - are worth exploring2022A&A...666A..64Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A64https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/666/A64/tablec1 (Candidate stars in the Sagittarius stream from the Gaia eDR3 sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A64/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A64/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A64/tablec1?GETtext/xml+votable180.050000true2.26251373949-20.48873161220.0055555555555555563/263-264 734 4/1035 1037-1039 1047 1049 1051 1060-1061 1063 1065 1072 1080 1090 1094-1096 1098 1100-1101 1105 1107 1109-1112 1616 1618-1619 1624-1625 1627-1628 1630-1631 1645 1648-1649 1653 1657-1658 1742 1962 2804-2805 2807 2809 2811-2814 2919 2925-2927 2931-2933 2935 2940-2941 2943 2967 2973 2975 2995 2997 3000-3002 3009-3013 3015-3018 3024-3025 5/4 9-10 14 22 44 73 1102 1105 1107 1112-1113 1117 1124 1130 1132 1175 1181 1216 1282 1299 2048 2056 2058-2060 2080 2082 2088 4111 4129-4131 4134-4136 4138-4139 4145 4147 4163 4168-4169 4171 4173-4175 4180 4183 4186-4187 4192-4193 4195 4200-4202 4248-4249 4251 4256 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49106 49115 49124https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/666/A64?format=asciiOpticaldefaultJ/A+A/666/A64/tablec1Candidate stars in the Sagittarius stream from the Gaia eDR3 samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNRgLAMOST? Signal to noise in g-band (LAMOST) (snrg_LAMOST)stat.snrfloatnullableSNRSEGUE? Signal to noise (SEGUE) (SNR_SEGUE)stat.snrfloatnullableProbBrightProbability to belong to bright arm (Prob_bright)stat.fit.goodnessdoubleProbFaintProbability to belong to faint arm (Prob_faint)stat.fit.goodnessdoubleProbSGRProbability to belong to the stream (Prob_sgr)stat.fit.goodnessdoubleProbPlxParallax score (Prob_plx)stat.fit.goodnessdouble_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedGaiaEDR3Gaia eDR3 Unique source identifier (source_id)meta.id;meta.mainGmagG-band mean magnitude (phot_g_mean_mag)magphot.mag;em.optdoubleBP-RPG_BP_ minus G_RP_ colour (bp_rp)magphot.color;em.opt.B;em.opt.RdoubleRA_ICRSRight ascension (ICRS) at Ep=2015.5 (ra)degpos.eq.ra;meta.mainindexedDE_ICRSDeclination (ICRS) at Ep=2015.5 (dec)degpos.eq.dec;meta.mainindexedpmRAProper motion in right ascension direction (J2015.5) (pmra)mas/yrpos.pm;pos.eq.radoublepmDEProper motion in declination direction (J2015.5) (pmdec)mas/yrpos.pm;pos.eq.decdoublee_pmRAError in pmRA (pmra_error)mas/yrstat.error;pos.pm;pos.eq.rafloate_pmDEError in pmDE (pmdec_error)mas/yrstat.error;pos.pm;pos.eq.decfloatDistWGBPRP? Photometric distance (only RR Lyrae.) (Dist_WGBPRP)kpcpos.distancedoublenullablee_DistWGBPRP? Error in distance (only RR Lyrae) (Dist_WGBPRP_err)kpcstat.errordoublenullableVlos? Line of sight velocity (vlos)km/sphys.velocdoublenullabler_VlosSource of the radal velocity (vlos_source)meta.ref;pos.framechar[Fe/H]APOGEE? Metallicity from APOGEE (FEH_APOGEE)phys.abund.Fedoublenullable[alpha/M]APOGEE? Alpha over iron from APOGEE (ALPHA_M_APOGEE)phys.abunddoublenullable[Fe/H]LAMOST? Metallicity from LAMOST (FEH_LAMOST)phys.abund.Fefloatnullable[Fe/H]SEGUE? Metallicity from SEGUE (FEH_SEGUE)phys.abund.FefloatnullableSNRAPOGEE? Signal to noise (APOGEE, SNREV) (SNR_APOGEE)stat.snrfloatnullable