Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem
[Contex] The structure and dynamics of the central bar of the Milky Way (MW) are still under debate whilst being fundamental ingredients for the evolution of our Galaxy. The recent Gaia DR3 offers an unprecedented detailed view of the 6D phase space of the MW, allowing for a better understanding of...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/365849 |
| Acceso en línea: | http://hdl.handle.net/10261/365849 |
| Access Level: | acceso abierto |
| Palabra clave: | Methods: data analysis Galaxy: disk Galaxy: evolution Galaxy: kinematics and dynamics Galaxy: structure |
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Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| title |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| spellingShingle |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem Bernet, Marcel Methods: data analysis Galaxy: disk Galaxy: evolution Galaxy: kinematics and dynamics Galaxy: structure |
| title_short |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| title_full |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| title_fullStr |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| title_full_unstemmed |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| title_sort |
Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problem |
| dc.creator.none.fl_str_mv |
Bernet, Marcel Ramos, Pau Antoja, Teresa Monari, Giacomo Famaey, Benoit |
| author |
Bernet, Marcel |
| author_facet |
Bernet, Marcel Ramos, Pau Antoja, Teresa Monari, Giacomo Famaey, Benoit |
| author_role |
author |
| author2 |
Ramos, Pau Antoja, Teresa Monari, Giacomo Famaey, Benoit |
| author2_role |
author author author author |
| dc.contributor.none.fl_str_mv |
European Space Agency European Commission Ministerio de Ciencia e Innovación (España) Ministerio de Ciencia, Innovación y Universidades (España) Agencia Estatal de Investigación (España) European Research Council Agence Nationale de la Recherche (France) |
| dc.subject.none.fl_str_mv |
Methods: data analysis Galaxy: disk Galaxy: evolution Galaxy: kinematics and dynamics Galaxy: structure |
| topic |
Methods: data analysis Galaxy: disk Galaxy: evolution Galaxy: kinematics and dynamics Galaxy: structure |
| description |
[Contex] The structure and dynamics of the central bar of the Milky Way (MW) are still under debate whilst being fundamental ingredients for the evolution of our Galaxy. The recent Gaia DR3 offers an unprecedented detailed view of the 6D phase space of the MW, allowing for a better understanding of the complex imprints of the bar on the phase space. |
| publishDate |
2024 |
| dc.date.none.fl_str_mv |
2024 2024 2024 |
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info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Publisher's version info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10261/365849 |
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http://hdl.handle.net/10261/365849 |
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EDP Sciences |
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Radial and azimuthal gradients of the moving groups in Gaia DR3: The slow and fast bar degeneracy problemBernet, MarcelRamos, PauAntoja, TeresaMonari, GiacomoFamaey, BenoitMethods: data analysisGalaxy: diskGalaxy: evolutionGalaxy: kinematics and dynamicsGalaxy: structure[Contex] The structure and dynamics of the central bar of the Milky Way (MW) are still under debate whilst being fundamental ingredients for the evolution of our Galaxy. The recent Gaia DR3 offers an unprecedented detailed view of the 6D phase space of the MW, allowing for a better understanding of the complex imprints of the bar on the phase space.[Aims] We aim to identify and characterise the dynamical moving groups across the MW disc, and use their large-scale distribution to help constrain the properties of the Galactic bar.[Methods] We used 1D wavelet transforms of the azimuthal velocity (Vϕ) distribution in bins of radial velocity to robustly detect the kinematic substructure in the Gaia DR3 catalogue. We then connected these structures across the disc to measure the azimuthal (ϕ) and radial (R) gradients of Vϕ of the moving groups. We simulated thousands of perturbed distribution functions using backward integration, sweeping a large portion of parameter space of feasible Galaxy models that include a bar, in order to compare them with the data and to explore and quantify the degeneracies.[Results] The radial gradient of the Hercules moving group (∂Vϕ/∂R = 28.1 ± 2.8 km s−1 kpc−1) cannot be reproduced by our simple models of the Galaxy that show much larger slopes both for a fast and a slow bar. This suggests the need for more complex dynamics (e.g. a different bar potential, spiral arms, a slowing bar, a complex circular velocity curve, external perturbations, etc.). We measured an azimuthal gradient for Hercules of ∂Vϕ/∂ϕ = −0.63 ± 0.13 km s−1 deg−1 and find that it is compatible with both the slow and fast bar models. Our analysis points out that in using this type of analysis, at least two moving groups are needed to start breaking the degeneracies.[Conclusions] We conclude that it is not sufficient for a model to replicate the local velocity distribution; it must also capture its larger-scale variations. The accurate quantification of the gradients, especially in the azimuthal direction, will be key for the understanding of the dynamics governing the disc.This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. We acknowledge the grants PID2021-125451NA-I00 and CNS2022-135232 funded by MICIU/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”, by the “European Union” and by the “European Union Next Generation EU/PRTR”, and the Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia ‘María de Maeztu’) through grant CEX2019-000918-M. This work was partially supported by the OCRE awarded project Galactic Research in Cloud Services (Galactic RainCloudS). OCRE receives funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 824079. M.B. acknowledges funding from the University of Barcelona’s official doctoral program for the development of a R+D+i project under the PREDOCS-UB grant. T.A. acknowledges the grant RYC2018-025968-I funded by MCIN/AEI/10.13039/501100011033 and by “ESF Investing in your future”. B.F. and G.M. acknowledge funding from the Agence Nationale de la Recherche (ANR project ANR-18-CE31-0006 and ANR-19-CE31- 0017) and from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 834148).With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2019-000918-M).Peer reviewedEDP SciencesEuropean Space AgencyEuropean CommissionMinisterio de Ciencia e Innovación (España)Ministerio de Ciencia, Innovación y Universidades (España)Agencia Estatal de Investigación (España)European Research CouncilAgence Nationale de la Recherche (France)202420242024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/365849reponame: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##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2019-000918-Minfo:eu-repo/grantAgreement/EC/H2020/824079info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-125451NA-I00info:eu-repo/grantAgreement/AEI//CNS2022-135232info:eu-repo/grantAgreement/AEI//RYC2018-025968-I finfo:eu-repo/grantAgreement/EC/H2020/834148https://doi.org/10.1051/0004-6361/202348410Noinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3658492026-05-22T06:33:51Z |
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