J/A+A/635/L3ivo://CDS.VizieR/J/A+A/635/L3doi:10.26093/cds/vizier.36359003CDSAntoja T.Ramos P.Mateu C.Helmi A.Anders F.Jordi C.,Carballo-Bello J.2021-02-04T12:15:41Z2020-03-04T07:02:55ZCDS support team

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

cds-question@unistra.frgalaxiesproper-motionsastrometryphotometryWe aim to measure the proper motion along the Sagittarius stream, which is the missing piece in determining its full 6D phase space coordinates. We conduct a blind search of over-densities in proper motion from the Gaia second data release (DR2) in a broad region around the Sagittarius stream by applying wavelet transform techniques. We find that for most of the sky patches, the highest intensity peaks delineate the path of the Sagittarius stream. The 1500 peaks identified depict a continuous sequence spanning almost 2pi in the sky, only obscured when the stream crosses the Galactic disk. Altogether, around 100000 stars potentially belong to the stream as indicated by a coarse inspection of the color-magnitude diagrams. From these stars, we determine the proper motion along the Sagittarius stream, making it the proper-motion sequence with the largest span and continuity ever measured for a stream. A first comparison with existing N-body models of the stream reveals some discrepancies, especially near the pericenter of the trailing arm and an underestimation of the total proper motion for the leading arm. Our study provides a starting point for determining the variation of the population of stars along the stream, the distance to the stream from the red clump stars, and the solar motion. It also permits much more accurate measurement of the Milky Way potential.2020A&A...635L...3Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/635/L3CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/635/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/635/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/635/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/635/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/635/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/635/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/635/L3/tablee1 (Candidate member stars of the Sagittarius stream (corrected version, 04-Feb-2021))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/635/L3/tablee1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/635/L3/tablee1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/635/L3/tablee1?GETtext/xml+votable180.050000true45.282227657912610.309318281729110.0055555555555555563/259 262-265 273-275 277-279 405-407 433 435 701 703 734-735 753 4/0 2 8 10 278 512 514 1034-1035 1043 1046-1047 1064-1066 1068 1072-1074 1076-1078 1080-1081 1089-1091 1105-1107 1120-1121 1124-1125 1136 1613 1615-1616 1618-1619 1639 1645 1647-1650 1652-1653 1656-1658 1660 1662 1727 1739 1744-1745 1747-1748 1752-1753 1761-1763 1765-1768 1770 1930 1952 1954 2302-2303 2781-2783 2803 2809-2811 2925-2927 2931 2933-2935 2973-2975 2993 2995-2997 3000-3002 3009-3011 3016-3018 3020-3021 3024 3026 5/12 14 36 38 44-46 128-129 132 1105 1107-1108 1110-1111 1117 1125-1127 1129 1131-1133 1135-1136 1140 1151 1220-1221 1280 1283-1285 1288 1292-1293 1299 1306 1317-1320 1322 1408 2080-2082 2088 2090 2176 4126-4127 4135 4169-4171 4179 4182-4183 4268 4270-4271 4276-4277 4279 4282-4284 4300-4302 4316 4318-4319 4328 4336-4337 4340 4354-4355 4417-4419 4488-4490 4492-4494 4504-4505 4508-4509 4548-4550 4560-4562 4608 4610 4612 5794 5800 5802 6421 6423 6429-6431 6469-6471 6547 6549-6551 6555 6578 6586-6587 6604-6606 6616-6618 6620 6622-6623 6636-6637 6639 6644-6645 6652-6654 6901 6903 6919 6949-6951 6955 6984 6986-6987 6996 6998 7000 7002-7003 7017-7020 7022 7026 7033 7056-7058 7076-7078 7084 7086 7088-7089 7091-7092 7094 7096 7098-7099 7104 7106-7108 7112-7114 7117 7120 7136 7189 7232 7712 7714-7715 7812 7814 7821 7840-7842 7844 7846 7848 7850-7852 9150-9151 9194-9195 9197-9199 11099-11100 11102-11103 11111 11117-11119 11121-11123 11204-11205 11207 11233-11235 11645-11647 11693 11695 11698 11718 11721-11723 11729-11731 11863 11867 11869-11871 11887 11889 11891 11959 11965 11967 11977-11979 11993-11998 12012-12013 12016-12018 12034-12035 12076-12078 12088-12089 12092 12100-12102 12109 12111-12113 12115-12118 12121 12129 12160-12162 12164 6/18 24 26 62 148 150 156 158-159 232 234 4869 4892-4893 4973 23204 23206 23212 23214-23215 28932 48672https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/635/L3?format=asciidefaultJ/A+A/635/L3/tablee1Candidate member stars of the Sagittarius stream (corrected version, 04-Feb-2021)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceGaia DR2 Unique source identifier (source_id)meta.id;meta.mainRA_ICRSRight ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainindexedDE_ICRSDeclination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainindexedpmRAProper motion in right ascension direction, pmRA*cosDE (J2015.5)mas/yrpos.pm;pos.eq.rafloatpmDEProper motion in declination direction (J2015.5)mas/yrpos.pm;pos.eq.decfloatGmagG-band mean magnitude (phot_g_mean_mag)magphot.mag;em.optfloatB-RBP - RP colour (bp_rp)magphot.color;em.opt.B;em.opt.Rfloat_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.decnullableindexed