Sagittarius stream with RRLs from Gaia DR3 J/A+A/701/A228 ivo://CDS.VizieR/J/A+A/701/A228 doi:10.26093/cds/vizier/bc-nx/lcci CDS Muraveva T. Bellazzini M. Garofalo A. Clementini G. Monti L.,Valentini M.L. 2026-08-03T06:57:12Z 2025-09-19T08:41:04Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr variable-stars metallicity stellar-distance visible-astronomy The Sagittarius (Sgr) dwarf spheroidal galaxy is one of the most prominent satellites of the Milky Way (MW). It is currently undergoing tidal disruption, forming an extensive stellar stream that provides key insights into the assembly history of the MW halo. Our goal is to investigate the structure and metallicity distribution of the Sgr stream using RR Lyrae stars (RRLs). We analyzed RRLs provided in Gaia Data Release 3 (DR3), for which new estimates of photometric metallicities are available in the literature, and accurate distances were calculated using the reddening-free period-Wesenheit-metallicity (PWZ) relation in the Gaia G, G BP , and GRP bands. We determine the mean metallicity of RRLs in the Sgr stream to be [Fe/H]=-1.62+/-0.01dex. We measure a metallicity gradient as a function of stripping time from the Sgr progenitor of 0.05+/-0.02dex/Gyr, indicating that the metal-poor RRLs were stripped earlier during the accretion process. The far arm is found to be the most metal-poor structure of the Sgr stream, with a mean metallicity of [Fe/H]=-1.98+/-0.37dex, significantly lower than that of the leading (-1.69+/-0.31dex) and trailing (-1.64+/-0.28dex) arms. Our findings show that the RRLs in the far arm of the Sgr stream exhibit a bimodal metallicity distribution with peaks at [Fe/H]=-2.4dex and -1.7dex. The main body of the stream is the most metal-rich structure, with a mean metallicity of [Fe/H]=-1.58+/-0.31dex and a radial gradient of -0.008+/-0.005 dex/kpc. We find almost negligible metallicity gradients of (-0.2+/-0.3)x10^-3^dex/deg in the trailing arm and (-1.0+/-0.5)x10^-3^dex/deg in the leading arm, in agreement with previous studies. Finally, we investigate the bifurcation of the Sgr stream and conclude that the metallicity difference between the faint and bright branches is not confirmed based on the RRLs in our sample. 2025A&A...701A.228M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/701/A228 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/701/A228 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/701/A228 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/701/A228 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/701/A228 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/701/A228 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/701/A228 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/701/A228/tablea1 (RRLS-SGR-R22 sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/701/A228/tablea1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/701/A228/tablea1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/701/A228/tablea1? GET text/xml+votable 180.0 50000 true 279.7316 -30.1663 0.005555555555555556 Cone search capability for table J/A+A/701/A228/tablea2 (RRLS-SGR-MODEL sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/701/A228/tablea2? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/701/A228/tablea2? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/701/A228/tablea2? GET text/xml+votable 180.0 50000 true 254.644 -21.1857 0.005555555555555556 Cone search capability for table J/A+A/701/A228/tablea3 (RRLS-SGR-SELECTION sample) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/701/A228/tablea3? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/701/A228/tablea3? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/701/A228/tablea3? GET text/xml+votable 180.0 50000 true 254.644 -21.1857 0.005555555555555556 4/1797 2975 2995-2998 3000-3002 5/64 2050 2080 4214 5867 6460 6463 6482 6488 6507-6508 6510 6512 6522 6589 6591-6592 6602 6604 6608-6609 6617 6625-6626 6632 6638 6640 6961 6976 7009 7014 7021 7185 7196 7232-7234 7240 7329 7336 7340 7695 7713-7714 7720 7722-7724 7727 7812 11097 11099 11103 11121 11123 11126 11128 11130 11132 11134 11225-11227 11256-11257 11893 11895 11897-11899 11959 11965-11967 11973 11975 11977 11979 11996 12012-12013 12048 12064 12066 12160 12162 6/3 5 10 12 16 21 29 31 33 35 40-41 48 52 60 63 67-68 85 88 91 97 110 112 115 117 125 128 142-143 146 159 163-164 171-172 180 188-189 194-195 210 215 222 239 241 262-265 267 270 272 275-276 278 280-281 284-286 289 297 300 306-307 309 311 313 317 327-328 333 335-336 342-343 345 349-351 353-354 356-357 360 375 380 388 391 400 403 405 421 436 438 451 454-455 462 464 467-468 473 477 491 514 518 523 773 780 788 818 839 1028 1032 1036 1058 1060 1065 1082 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48056-48058 48060 48062-48066 48068-48069 48072 48074 48077 48080 48083 48085 48097-48098 48101 48140 48147 48151 48153 48155 48159 48164 48166-48168 48170 48172-48174 48177-48179 48184-48185 48189 48196 48201 48204 48206-48207 48209-48211 48213-48215 48220-48222 48224 48230-48231 48234-48235 48239-48240 48242 48249-48250 48252 48255 48262-48263 48269-48270 48272-48273 48275-48276 48279-48280 48282-48284 48288 48290 48292 48295 48297-48300 48302 48305-48308 48310 48314 48316-48317 48322-48323 48329-48332 48336-48338 48340-48341 48343-48344 48346-48347 48349 48355 48360 48373 48384 48390 48394-48395 48398 48404-48405 48407 48409-48410 48424 48426-48427 48430-48431 48434 48439 48448 48450 48454 48482 48487 48506 48515 48524 48545 48549 48576 48644 48646 48656 48662 48664 48666 48672 48678 48686 48706 48781 48854 48908 48952 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/701/A228?format=ascii Optical default J/A+A/701/A228/tablea1 RRLS-SGR-R22 sample recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source identifier meta.id;meta.main RA_ICRS Right Ascension (ICRS) at Ep=2016.0 deg pos.eq.ra;meta.main DE_ICRS Declination (ICRS) at Ep=2016.0 deg pos.eq.dec;meta.main pmRA Proper motion in right ascension direction mas/yr pos.pm;pos.eq.ra float pmDE Proper motion in declination direction mas/yr pos.pm;pos.eq.dec float [Fe/H] Photometric metallicity phys.abund.Z float _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec indexed e_[Fe/H] Uncertainty in photometric metallicity stat.error;phys.abund.Fe float Dist Heliocentric distance kpc pos.distance float e_Dist Uncertainty in heliocentric distance kpc stat.error float
J/A+A/701/A228/tablea2 RRLS-SGR-MODEL sample _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source identifier meta.id;meta.main RA_ICRS Right Ascension (ICRS) at Ep=2016.0 deg pos.eq.ra;meta.main DE_ICRS Declination (ICRS) at Ep=2016.0 deg pos.eq.dec;meta.main pmRA Proper motion in right ascension direction mas/yr pos.pm;pos.eq.ra float pmDE Proper motion in declination direction mas/yr pos.pm;pos.eq.dec float [Fe/H] Photometric metallicity phys.abund.Z float e_[Fe/H] Uncertainty in photometric metallicity stat.error;phys.abund.Fe float Dist Heliocentric distance kpc pos.distance float e_Dist Uncertainty in heliocentric distance kpc stat.error float
J/A+A/701/A228/tablea3 RRLS-SGR-SELECTION sample _RA.icrs Right ascension (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.ra indexed _DE.icrs Declination (ICRS) at Epoch=J2000, proper motions taken into account deg pos.eq.dec indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source identifier meta.id;meta.main RA_ICRS Right Ascension (ICRS) at Ep=2016.0 deg pos.eq.ra;meta.main DE_ICRS Declination (ICRS) at Ep=2016.0 deg pos.eq.dec;meta.main pmRA Proper motion in right ascension direction mas/yr pos.pm;pos.eq.ra float pmDE Proper motion in declination direction mas/yr pos.pm;pos.eq.dec float [Fe/H] Photometric metallicity phys.abund.Z float e_[Fe/H] Uncertainty in photometric metallicity stat.error;phys.abund.Fe float Dist Heliocentric distance kpc pos.distance float e_Dist Uncertainty in heliocentric distance kpc stat.error float