Pristine survey. XXVIII. J/A+A/706/A195 ivo://CDS.VizieR/J/A+A/706/A195 doi:10.26093/cds/vizier/bc-p2/lbjf CDS Viswanathan A. Bystroem A. Starkenburg E. Foppen A. Straat J.,Montelius M. Sestito F. Venn K.A. Navarrete C. Matsuno T. Martin N.F.,Thomas G.F. Ardern-Arentsen A. Battaglia G. Fouesneau M. Navarro J.,Vitali S. 2026-03-02T20:01:13Z 2026-02-12T09:46:52Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys stellar-distance extinction radial-velocity visible-astronomy metallicity The outer Galactic halo remains relatively unexplored, particularly regarding its metallicity distribution, merger debris, and the population of very and extremely metal-poor ([Fe/H]<-2.5) stars. Using photometric metallicities from the Pristine survey data release 1 (PDR1) and Pristine- synthetic (PGS) catalogue and DR3 astrometry, we constructed well-characterised samples of bright (G<17.6) red giant branch (RGB) stars in the outer halo. With accurate distances, these samples enable studies of the halo's metallicity distribution, accreted debris, and very metal-poor (VMP) substructures beyond 40 kpc. We selected giants by excluding stars with reliable parallaxes in brightness ranges where dwarfs are measurable. Purity and completeness were validated against the Pristine spectroscopic training set. Distances were derived using BaSTI isochrone fitting combined with Pristine metallicity estimates. The photometric distances reach ~100kpc (PDR1) and ~70kpc (PGS), with typical uncertainties of 12% and scatter up to 20-40% compared to parallax- and StarHorse-based distances. The PDR1 sample provides a nearly unbiased metallicity-distance view, while the PGS sample offers an all-sky map, especially at the very metal-poor end. Using PDR1-giants, we traced the halo metallicity distribution function out to 101 kpc, fitting a three-component Gaussian mixture model. The most metal-poor component becomes increasingly dominant with distance, as beyond 50kpc, 40-50% of the stars are very metal-poor ([Fe/H]<-2.0). With added radial velocities, we identified metallicity trends in integrals-of-motion space and investigated accreted debris. The PGS sample reveals substructures, including the Pisces Plume, where 41 VMP stars are linked to the Magellanic stream. We publish two RGB catalogues: PDR1-giants (180314 stars, with 10096 very metal-poor candidates and 2096 beyond 40kpc) and PGS-giants (2420898 stars, with 75679 very metal-poor candidates and 267 beyond 40kpc). These catalogues represent extensive resources for future outer halo studies. 2026A&A...706A.195V https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/706/A195 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/354 : StarHorse2, Gaia EDR3 photo-astrometric distances J/A+A/692/A115 : Pristine survey DR1 (Martin+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/706/A195 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/706/A195 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/706/A195 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/706/A195 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/706/A195 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/706/A195 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/706/A195/rgb-pdr1 (PDR1-giants (180314 stars, with 10096 very metal-poor candidates and 2096 beyond 40kpc) catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/706/A195/rgb-pdr1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/706/A195/rgb-pdr1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/706/A195/rgb-pdr1? GET text/xml+votable 180.0 50000 true 217.9710122814813 4.6261631415559 0.005555555555555556 Cone search capability for table J/A+A/706/A195/rgb-pgs (PGS-giants (2420898 stars, with 75679 very metal-poor candidates and 267 beyond 40kpc) catalog) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/706/A195/rgb-pgs? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/706/A195/rgb-pgs? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/706/A195/rgb-pgs? GET text/xml+votable 180.0 50000 true 317.606366 3.011967 0.005555555555555556 0/1-2 11 1/17-19 24-25 33-35 2/2 8-10 48-49 52-53 58-59 62 65 80 82 85 87-88 90 104 106-107 109 117 122-124 126-128 130-131 146 149 151-152 154 157 159 169-172 174-175 3/0 2-4 6-7 14-15 26 44-45 53 55 61 63 200-201 204-205 216-217 220 226-227 254-256 259 264 266-270 324 326 337 339 356 358 364-365 370 373 375 420-421 423 433-434 440 442-443 445 447 452-453 464-465 477 482-483 485-487 502-503 516 518-519 576 578-580 582 588 595 601 603 622 625-627 632-633 635 640-641 643-645 648 656-657 666 670 675 692 694-695 4/4-6 22-23 49-52 74-75 85 87 93 95 98 116-117 119 125 127 184-186 188 192 194 200 202 238-239 250-251 808-809 813 824 828-829 872-873 876-877 884-885 888 920 922-923 926-927 970 991 1013 1015 1028-1030 1032-1034 1061-1063 1085-1087 1302 1310 1328-1330 1336 1338 1340-1342 1381 1430-1431 1436-1438 1464-1466 1468 1484 1489 1491 1497 1506 1514-1515 1525 1527 1533 1535 1688-1690 1728-1730 1740-1741 1743 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38041-38043 38061 38063 38405 38436-38437 38439 38444 38543-38545 38569 39172 39175 39186 39189 39191-39192 39194 39216 39218-39219 39224 39226-39227 39230 39232 39293 39295 39316 39320 39322 39344 39346 39354 39381 39383 39389-39391 39409 39411 39421 39423 39762-39765 39767 39772-39773 39775 39778-39779 39782 39788 39797-39799 39801 39803 39892-39893 39916 39918 39937 39939 39945 39947 39968-39969 39971 40576-40577 40579 40613-40615 40621 40623 41096-41098 41132-41133 41135 41404-41406 41448-41449 41452-41453 41464-41465 41564-41566 41576-41577 41580 41585 41624-41626 41636-41637 41640-41642 41718-41719 41723 41728-41729 41847 41849 41851 41874 41887-41888 41890 41895-41896 41898-41899 41905-41907 41925-41927 41929-41931 42140-42142 42144-42146 42148-42149 42160 42184-42185 42192 42280-42281 42284-42285 42296-42297 42352-42353 42356-42357 42478-42479 42490 42531 42534-42535 42546-42547 42550-42551 42592 42594 42608 42610 42620 42622-42623 42737 42739 42779 42782-42783 42787 42790 42817 42819 42825-42827 42832 42834-42835 42838-42839 42944-42946 42955-42958 42968 42977-42979 42999 43004-43005 43038-43039 43057 43059 43079-43080 43082-43083 43139 44368-44370 44375 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/706/A195?format=ascii Optical default J/A+A/706/A195/rgb-pdr1 PDR1-giants (180314 stars, with 10096 very metal-poor candidates and 2096 beyond 40kpc) catalog recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source (source_id) meta.id;meta.main RA_ICRS Gaia DR3 right ascension (ICRS) at Ep=2016.0 (ra) deg pos.eq.ra;meta.main indexed _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 DE_ICRS Gaia DR3 declination (ICRS) at Ep=2016.0(dec) deg pos.eq.dec;meta.main indexed plx Gaia DR3 offset-corrected parallax (parallax) mas pos.parallax.trig double e_plx Offset-corrected uncertainty on the Gaia DR3 offset-corrected parallax (parallax_error) mas stat.error;pos.parallax double pmRA Gaia DR3 proper motion in RA direction (pmra) mas/yr pos.pm;pos.eq.ra double e_pmRA Uncertainty on Gaia DR3 proper motion in RA direction (pmra_error) mas/yr stat.error;pos.pm;pos.eq.ra double pmDE Gaia DR3 proper motion in DE direction (pmdec) mas/yr pos.pm;pos.eq.dec double e_pmDE Uncertainty on Gaia DR3 proper motion in DE direction (pmdec_error) mas/yr stat.error;pos.pm;pos.eq.dec double G0mag De-reddened Gaia DR3 G magnitude (G_0) mag phot.color.reddFree double BP0mag De-reddened Gaia DR3 BP magnitude (BP_0) mag phot.color.reddFree double RP0mag De-reddened Gaia DR3 RP magnitude (RP_0) mag phot.color.reddFree double Dist Photometric distance inferrer in this work (phot_dist) kpc pos.distance double e_Dist Uncertainty on photometric distance inferrer in this work (phot_dist_unc) kpc stat.error double Vlos ? Radial velocity cross-matched with spectroscopic surveys (v_los) km/s phys.veloc;pos.heliocentric double nullable e_Vlos ? Uncertainty in radial velocity cross-matched with spectroscopic surveys (v_los_unc) km/s stat.error double nullable [Fe/H] Photometric metallicity derived in the PDR1/PGCS catalogues (FeH_phot) meta.id double e_[Fe/H] Measurement uncertainty on the photometric metallicity derived in the PDR1/PGCS catalogues (FeH_phot_unc) stat.error;phys.abund.Fe double
J/A+A/706/A195/rgb-pgs PGS-giants (2420898 stars, with 75679 very metal-poor candidates and 267 beyond 40kpc) catalog e_Dist Uncertainty on photometric distance inferrer in this work (phot_dist_unc) kpc stat.error double _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 (source_id) meta.id;meta.main RA_ICRS Gaia DR3 right ascension (ICRS) at Ep=2016.0 (ra) deg pos.eq.ra;meta.main indexed DE_ICRS Gaia DR3 declination (ICRS) at Ep=2016.0(dec) deg pos.eq.dec;meta.main indexed plx Gaia DR3 offset-corrected parallax (parallax) mas pos.parallax.trig double e_plx Offset-corrected uncertainty on the Gaia DR3 offset-corrected parallax (parallax_error) mas stat.error;pos.parallax double pmRA Gaia DR3 proper motion in RA direction (pmra) mas/yr pos.pm;pos.eq.ra double e_pmRA Uncertainty on Gaia DR3 proper motion in RA direction (pmra_error) mas/yr stat.error;pos.pm;pos.eq.ra double pmDE Gaia DR3 proper motion in DE direction (pmdec) mas/yr pos.pm;pos.eq.dec double e_pmDE Uncertainty on Gaia DR3 proper motion in DE direction (pmdec_error) mas/yr stat.error;pos.pm;pos.eq.dec double G0mag De-reddened Gaia DR3 G magnitude (G_0) mag phot.color.reddFree double BP0mag De-reddened Gaia DR3 BP magnitude (BP_0) mag phot.color.reddFree double RP0mag De-reddened Gaia DR3 RP magnitude (RP_0) mag phot.color.reddFree double Dist Photometric distance inferrer in this work (phot_dist) kpc pos.distance double Vlos ? Radial velocity cross-matched with spectroscopic surveys (v_los) km/s phys.veloc;pos.heliocentric double nullable e_Vlos ? Uncertainty in radial velocity cross-matched with spectroscopic surveys (v_los_unc) km/s stat.error double nullable [Fe/H] Photometric metallicity derived in the PDR1/PGCS catalogues (FeH_phot) meta.id double e_[Fe/H] Measurement uncertainty on the photometric metallicity derived in the PDR1/PGCS catalogues (FeH_phot_unc) stat.error;phys.abund.Fe double