{"paper":{"title":"A new stellar chemo-kinematic relation reveals the merger history of the Milky Way disc","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"A. C. Quillen, A. Helmi, A. Siebert, A. Siviero, B. Famaey, B. K. Gibson, C. Boeche, C. Chiappini, C. Scannapieco, E. K. Grebel, F. Watson, G. Gilmore, G. Kordopatis, G. Seabroke, I. Minchev, J. Bland-Hawthorn, J. F. Navarro, J. J. Binney, K. C. Freeman, M. Martig, M. Steinmetz, M. Williams, O. Bienayme, Q. A. Parker, R. F. G. Wyse, R. S. de Jong, T. Zwitter, U. Munari, W. A. Reid, Y. S. Lee","submitted_at":"2013-10-18T20:00:01Z","abstract_excerpt":"The velocity dispersions of stars near the Sun are known to increase with stellar age, but age can be difficult to determine so a proxy like the abundance of alpha elements (e.g., Mg) with respect to iron, [alpha/Fe], is used. Here we report an unexpected behavior found in the velocity dispersion of a sample of giant stars from the RAdial Velocity Experiment (RAVE) survey with high quality chemical and kinematical information, in that it decreases strongly for stars with [Mg/Fe] > 0.4 dex (i.e., those that formed in the first Gyr of the Galaxy's life). These findings can be explained by pertur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1310.5145","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"}