| Téléchargement | - Voir la version finale : Chemical mapping of the Milky Way with the Canada–France Imaging Survey: a non-parametric metallicity–distance decomposition of the Galaxy (PDF, 21.2 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.3847/1538-4357/aa8562 |
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| Auteur | Rechercher : Ibata, Rodrigo A.; Rechercher : McConnachie, Alan1; Rechercher : Cuillandre, Jean-Charles; Rechercher : Fantin, Nicholas1; Rechercher : Haywood, Misha; Rechercher : Martin, Nicolas F.1; Rechercher : Bergeron, Pierre; Rechercher : Beckmann, Volker; Rechercher : Bernard, Edouard; Rechercher : Bonifacio, Piercarlo; Rechercher : Caffau, Elisabetta; Rechercher : Carlberg, Raymond; Rechercher : Côté, Patrick1; Rechercher : Cabanac, Rémi; Rechercher : Chapman, Scott; Rechercher : Duc, Pierre-Alain; Rechercher : Durret, Florence; Rechercher : Famaey, Benoît; Rechercher : Fabbro, Sébastien1; Rechercher : Gwyn, Stephen1; Rechercher : Hammer, Francois; Rechercher : Hill, Vanessa; Rechercher : Hudson, Michael J.; Rechercher : Lançon, Ariane; Rechercher : Lewis, Geraint; Rechercher : Malhan, Khyati; Rechercher : Matteo, Paola Di; Rechercher : Mccracken, Henry; Rechercher : Mei, Simona; Rechercher : Mellier, Yannick; Rechercher : Navarro, Julio; Rechercher : Pires, Sandrine; Rechercher : Pritchet, Chris; Rechercher : Reylé, Celine; Rechercher : Richer, Harvey; Rechercher : Robin, Annie C.; Rechercher : Jannsen, Rubén Sánchez; Rechercher : Sawicki, Marcin; Rechercher : Scott, Douglas; Rechercher : Scottez, Vivien; Rechercher : Spekkens, Kristine; Rechercher : Starkenburg, Else; Rechercher : Thomas, Guillaume; Rechercher : Venn, Kim |
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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 | galaxies: formation; galaxy: halo; galaxy: stellar content; galaxy: structure; surveys |
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| Résumé | We present the chemical distribution of the Milky Way, based on 2900 deg2 of u-band photometry taken as part of the Canada–France Imaging Survey. When complete, this survey will cover 10,000 deg2 of the northern sky. By combing the CFHT u-band photometry together with Sloan Digital Sky Survey and Pan-STARRS g,r, and i, we demonstrate that we are able to reliably measure the metallicities of individual stars to ~0.2 dex, and hence additionally obtain good photometric distance estimates. This survey thus permits the measurement of metallicities and distances of the dominant main-sequence (MS) population out to approximately 30 kpc, and provides a much higher number of stars at large extraplanar distances than have been available from previous surveys. We develop a non-parametric distance–metallicity decomposition algorithm and apply it to the sky at 30o < | b| < 70o and to the North Galactic Cap. We find that the metallicity–distance distribution is well-represented by three populations whose metallicity distributions do not vary significantly with vertical height above the disk. As traced in MS stars, the stellar halo component shows a vertical density profile that is close to exponential, with a scale height of around 3 kpc. This may indicate that the inner halo was formed partly from disk stars ejected in an ancient minor merger. |
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| Date de publication | 2017-10-20 |
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| Maison d’édition | American Astronomical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 23002642 |
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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 | 6ab53ee7-968f-4971-a0b8-599c6ad64c7a |
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| Enregistrement créé | 2017-12-08 |
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| Enregistrement modifié | 2020-05-30 |
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