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Article: A new stellar chemo-kinematic relation reveals the merger history of the milky way disk

TitleA new stellar chemo-kinematic relation reveals the merger history of the milky way disk
Authors
KeywordsGalaxy: abundances
Galaxy: formation
Galaxy: disk
Galaxy: evolution
solar neighborhood
Galaxy: kinematics and dynamics
Issue Date2014
Citation
Astrophysical Journal Letters, 2014, v. 781, n. 1 How to Cite?
AbstractThe 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 α elements (e.g., Mg) with respect to iron, [α/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 survey with high-quality chemical and kinematic information, in that it decreases strongly for stars with [Mg/Fe] > 0.4 dex (i.e., those that formed in the first gigayear of the Galaxy's life). These findings can be explained by perturbations from massive mergers in the early universe, which have affected the outer parts of the disk more strongly, and the subsequent radial migration of stars with cooler kinematics from the inner disk. Similar reversed trends in velocity dispersion are also found for different metallicity subpopulations. Our results suggest that the Milky Way disk merger history can be recovered by relating the observed chemo-kinematic relations to the properties of past merger events. © 2014. The American Astronomical Society. All rights reserved..
Persistent Identifierhttp://hdl.handle.net/10722/209018
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369

 

DC FieldValueLanguage
dc.contributor.authorMinchev, Ivan-
dc.contributor.authorChiappini, Cristina-
dc.contributor.authorMartig, Marie-
dc.contributor.authorSteinmetz, Matthias-
dc.contributor.authorDe Jong, Roelof S.-
dc.contributor.authorBoeche, Corrado-
dc.contributor.authorScannapieco, Cecilia-
dc.contributor.authorZwitter, Tomaž-
dc.contributor.authorWyse, Rosemary F G-
dc.contributor.authorBinney, James J.-
dc.contributor.authorBland-Hawthorn, Joss Bland-
dc.contributor.authorBienaymé, Olivier-
dc.contributor.authorFamaey, Benoît-
dc.contributor.authorFreeman, Kenneth C.-
dc.contributor.authorGibson, Brad K.-
dc.contributor.authorGrebel, Eva K.-
dc.contributor.authorGilmore, Gerard F.-
dc.contributor.authorHelmi, Amina-
dc.contributor.authorKordopatis, Georges-
dc.contributor.authorLee, Youngsun-
dc.contributor.authorMunari, Ulisse-
dc.contributor.authorNavarro, Julio F.-
dc.contributor.authorParker, Quentin A.-
dc.contributor.authorQuillen, Alice C.-
dc.contributor.authorReid, Warren A.-
dc.contributor.authorSiebert, Arnaud-
dc.contributor.authorSiviero, Alessandro-
dc.contributor.authorSeabroke, George M.-
dc.contributor.authorWatson, Fred G.-
dc.contributor.authorWilliams, Mary E K-
dc.date.accessioned2015-03-23T02:31:10Z-
dc.date.available2015-03-23T02:31:10Z-
dc.date.issued2014-
dc.identifier.citationAstrophysical Journal Letters, 2014, v. 781, n. 1-
dc.identifier.issn2041-8205-
dc.identifier.urihttp://hdl.handle.net/10722/209018-
dc.description.abstractThe 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 α elements (e.g., Mg) with respect to iron, [α/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 survey with high-quality chemical and kinematic information, in that it decreases strongly for stars with [Mg/Fe] > 0.4 dex (i.e., those that formed in the first gigayear of the Galaxy's life). These findings can be explained by perturbations from massive mergers in the early universe, which have affected the outer parts of the disk more strongly, and the subsequent radial migration of stars with cooler kinematics from the inner disk. Similar reversed trends in velocity dispersion are also found for different metallicity subpopulations. Our results suggest that the Milky Way disk merger history can be recovered by relating the observed chemo-kinematic relations to the properties of past merger events. © 2014. The American Astronomical Society. All rights reserved..-
dc.languageeng-
dc.relation.ispartofAstrophysical Journal Letters-
dc.subjectGalaxy: abundances-
dc.subjectGalaxy: formation-
dc.subjectGalaxy: disk-
dc.subjectGalaxy: evolution-
dc.subjectsolar neighborhood-
dc.subjectGalaxy: kinematics and dynamics-
dc.titleA new stellar chemo-kinematic relation reveals the merger history of the milky way disk-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/2041-8205/781/1/L20-
dc.identifier.scopuseid_2-s2.0-84891885751-
dc.identifier.volume781-
dc.identifier.issue1-
dc.identifier.eissn2041-8213-

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