{"paper":{"title":"Exploring the Galaxy's halo and very metal-weak thick disk with SkyMapper and Gaia DR2","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. D. Mackey, A. F. Marino, A. Frebel, A. M. Amarsi, A. P. Milone, A. R. Casey, B. P. Schmidt, D. Yong, G. Cordoni, G. S. Da Costa, J. E. Norris, K. Lind, M. Asplund, M. S. Bessell, S. J. Murphy, S. Monty, T. Nordlander, T. Xylakis-Dornbusch, X. D. Gao","submitted_at":"2020-11-02T18:29:00Z","abstract_excerpt":"In this work we combine spectroscopic information from the \\textit{SkyMapper survey for Extremely Metal-Poor stars} and astrometry from Gaia DR2 to investigate the kinematics of a sample of 475 stars with a metallicity range of $ -6.5 \\leq \\rm [Fe/H] \\leq -2.05$ dex. Exploiting the action map, we identify 16 and 40 stars dynamically consistent with the \\textit{Gaia Sausage} and \\textit{Gaia Sequoia} accretion events, respectively. The most metal-poor of these candidates have metallicities of $\\rm [Fe/H]=-3.31$ and $\\rm [Fe/H]=-3.74$, respectively, helping to define the low-metallicity tail of "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2011.01189","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2011.01189/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}