| Téléchargement | - Voir les données supplémentaires : The Pristine Inner Galaxy Survey (PIGS) I: tracing the kinematics of metal-poor stars in the Galactic bulge (PDF, 624 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1093/mnrasl/slz156 |
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| Auteur | Rechercher : Arentsen, A.Identifiant ORCID : https://orcid.org/0000-0002-0544-2217; Rechercher : Starkenburg, E.; Rechercher : Martin, N. F.; Rechercher : Hill, V.; Rechercher : Ibata, R.; Rechercher : Kunder, A.; Rechercher : Schultheis, M.; Rechercher : Venn, K. A.Identifiant ORCID : https://orcid.org/0000-0003-4134-2042; Rechercher : Zucker, D. B.; Rechercher : Aguado, D.; Rechercher : Carlberg, R.; Rechercher : González Hernández, J. I.; Rechercher : Lardo, C.Identifiant ORCID : https://orcid.org/0000-0002-4295-8773; Rechercher : Longeard, N.; Rechercher : Malhan, K.; Rechercher : Navarro, J. F.; Rechercher : Sánchez-Janssen, R.Identifiant ORCID : https://orcid.org/0000-0003-4945-0056; Rechercher : Sestito, F.; Rechercher : Thomas, G.1; Rechercher : Youakim, K.Identifiant ORCID : https://orcid.org/0000-0002-2625-9825; Rechercher : Lewis, G. F.Identifiant ORCID : https://orcid.org/0000-0003-3081-9319; Rechercher : Simpson, J. D.Identifiant ORCID : https://orcid.org/0000-0002-8165-2507; Rechercher : Wan, Z.Identifiant ORCID : https://orcid.org/0000-0002-3105-3821 |
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| Affiliation | - Conseil national de recherches du Canada. Herzberg en astronomie et en astrophysique
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| Format | Texte, Article |
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| Sujet | Galaxy: bulge; Galaxy: evolution; Galaxy: formation; Galaxy: halo; Galaxy: kinematics and dynamics; Galaxy: structure |
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| Résumé | Our Galaxy is known to contain a central boxy/peanut-shaped bulge, yet the importance of a classical, pressure-supported component within the central part of the Milky Way is still being debated. It should be most visible at low metallicity, a regime that has not yet been studied in detail. Using metallicity-sensitive narrow-band photometry, the Pristine Inner Galaxy Survey (PIGS) has collected a large sample of metal-poor ([Fe/H]<-1.0) stars in the inner Galaxy to address this open question. We use PIGS to trace the metal-poor inner Galaxy kinematics as function of metallicity for the first time. We find that the rotational signal decreases with decreasing [Fe/H] , until it becomes negligible for the most metal-poor stars. Additionally, the velocity dispersion increases with decreasing metallicity for -3.0 <[Fe/H]<-0.5, with a gradient of −44 ± 4 km s⁻¹ dex⁻¹. These observations may signal a transition between Galactic components of different metallicities and kinematics, a different mapping on to the boxy/peanut-shaped bulge for former disc stars of different metallicities and/or the secular dynamical and gravitational influence of the bar on the pressure-supported component. Our results provide strong constraints on models that attempt to explain the properties of the inner Galaxy. |
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| Date de publication | 2019-10-18 |
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| Maison d’édition | Oxford University Press
Royal Astronomical Society |
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| Dans | |
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| Données connexes | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | b3d11716-8d5f-4c28-a108-e6b12490795b |
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| Enregistrement créé | 2020-10-30 |
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| Enregistrement modifié | 2020-11-09 |
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