The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone

This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Detalles Bibliográficos
Autores: Schultheis, Mathias, Fritz, T. K., Nandakumar, G., Rojas-Arriagada, A., Nogueras-Lara, Francisco, Feldmeier-Krause, A., Gerhard, O., Neumayer, N., Patrick, L.R., Prieto, M. A., Schödel, Rainer, Mastrobuono-Battisti, A., Sormani, M. C.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/251496
Acceso en línea:http://hdl.handle.net/10261/251496
Access Level:acceso abierto
Palabra clave:Galaxy: nucleus
Galaxy: structure
Galaxy: stellar content
Stars: fundamental parameters
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repository_id_str
dc.title.none.fl_str_mv The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
title The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
spellingShingle The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
Schultheis, Mathias
Galaxy: nucleus
Galaxy: structure
Galaxy: stellar content
Stars: fundamental parameters
title_short The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
title_full The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
title_fullStr The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
title_full_unstemmed The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
title_sort The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zone
dc.creator.none.fl_str_mv Schultheis, Mathias
Fritz, T. K.
Nandakumar, G.
Rojas-Arriagada, A.
Nogueras-Lara, Francisco
Feldmeier-Krause, A.
Gerhard, O.
Neumayer, N.
Patrick, L.R.
Prieto, M. A.
Schödel, Rainer
Mastrobuono-Battisti, A.
Sormani, M. C.
author Schultheis, Mathias
author_facet Schultheis, Mathias
Fritz, T. K.
Nandakumar, G.
Rojas-Arriagada, A.
Nogueras-Lara, Francisco
Feldmeier-Krause, A.
Gerhard, O.
Neumayer, N.
Patrick, L.R.
Prieto, M. A.
Schödel, Rainer
Mastrobuono-Battisti, A.
Sormani, M. C.
author_role author
author2 Fritz, T. K.
Nandakumar, G.
Rojas-Arriagada, A.
Nogueras-Lara, Francisco
Feldmeier-Krause, A.
Gerhard, O.
Neumayer, N.
Patrick, L.R.
Prieto, M. A.
Schödel, Rainer
Mastrobuono-Battisti, A.
Sormani, M. C.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Ciencia, Innovación y Universidades (España)
Ministerio de Economía y Competitividad (España)
German Research Foundation
European Research Council
Comisión Nacional de Investigación Científica y Tecnológica (Chile)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxy: nucleus
Galaxy: structure
Galaxy: stellar content
Stars: fundamental parameters
topic Galaxy: nucleus
Galaxy: structure
Galaxy: stellar content
Stars: fundamental parameters
description This is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/251496
url http://hdl.handle.net/10261/251496
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2017-0709
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-095049-B-C21
info:eu-repo/grantAgreement/EC/H2020/855130
http://dx.doi.org/10.1051/0004-6361/202140499
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eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling The nuclear stellar disc of the Milky Way: A dynamically cool and metal-rich component possibly formed from the central molecular zoneSchultheis, MathiasFritz, T. K.Nandakumar, G.Rojas-Arriagada, A.Nogueras-Lara, FranciscoFeldmeier-Krause, A.Gerhard, O.Neumayer, N.Patrick, L.R.Prieto, M. A.Schödel, RainerMastrobuono-Battisti, A.Sormani, M. C.Galaxy: nucleusGalaxy: structureGalaxy: stellar contentStars: fundamental parametersThis is an Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Context. The nuclear stellar disc (NSD) is, together with the nuclear star cluster (NSC) and the central massive black hole, one of the main components in the central parts of our Milky Way. However, until recently, only a few studies of the stellar content of the NSD have been obtained owing to extreme extinction and stellar crowding. Aims. We study the kinematics and global metallicities of the NSD based on the observations of K/M giant stars via a dedicated KMOS (VLT, ESO) spectroscopic survey. Methods. We traced radial velocities and metallicities, which were derived based on spectral indices (Na I and CO) along the NSD, and compared those with a Galactic bulge sample of APOGEE (DR16) and data from the NSC. Results. We find that the metallicity distribution function and the fraction of metal-rich and metal-poor stars in the NSD are different from the corresponding distributions and ratios of the NSC and the Galactic bulge. By tracing the velocity dispersion as a function of metallicity, we clearly see that the NSD is kinematically cool and that the velocity dispersion decreases with increasing metallicity contrary to the inner bulge sample of APOGEE (|b|< 4°). Using molecular gas tracers (H2CO, CO(4-3)) of the central molecular zone (CMZ), we find an astonishing agreement between the gas rotation and the rotation of the metal-rich population. This agreement indicates that the metal-rich stars could have formed from gas in the CMZ. On the other hand, the metal-poor stars show a much slower rotation profile with signs of counter-rotation, thereby indicating that these stars have a different origin. Conclusions. Coupling kinematics with global metallicities, our results demonstrate that the NSD is chemically and kinematically distinct with respect to the inner bulge, which indicates a different formation scenario. © M. Schultheis et al. 2021.M.S. acknowledges the Programme National de Cosmologie et Galaxies (PNCG) of CNRS/INSU, France, for financial support. We want to thank Karl Menten for discussing the molecular gas data. R.S. acknowledges financial support from the State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award for the Instituto de Astrofísica de Andalucía (SEV-2017-0709). R.S. acknowledges financial support from national project PGC2018-095049-B-C21 (MCIU/AEI/FEDER, UE). F.N.L. and N.N. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 138713538 – SFB 881 (“The Milky Way System”, subproject B08). M.C.S. acknowledges financial support from the German Research Foundation (DFG) via the collaborative research center (SFB 881,Project-ID 138713538) “The Milky Way System” (subprojects B1, B2, and B8) and from the European Research Council via the ERC Synergy Grant “ECOGAL – Understanding our Galactic ecosystem: from the disc of the Milky Way to the formation sites of stars and planets” (grant 855130). A.R.A. acknowledges support from FONDECYT through grant 3180203.Peer reviewedEDP SciencesEuropean CommissionMinisterio de Ciencia, Innovación y Universidades (España)Ministerio de Economía y Competitividad (España)German Research FoundationEuropean Research CouncilComisión Nacional de Investigación Científica y Tecnológica (Chile)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202120212021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/251496reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/SEV-2017-0709info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PGC2018-095049-B-C21info:eu-repo/grantAgreement/EC/H2020/855130http://dx.doi.org/10.1051/0004-6361/202140499Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2514962026-05-22T06:33:51Z
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