| Download | - View final version: Chemical mapping of the Milky Way with the Canada–France Imaging Survey: a non-parametric metallicity–distance decomposition of the Galaxy (PDF, 21.2 MiB)
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| DOI | Resolve DOI: https://doi.org/10.3847/1538-4357/aa8562 |
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| Author | Search for: Ibata, Rodrigo A.; Search for: McConnachie, Alan1; Search for: Cuillandre, Jean-Charles; Search for: Fantin, Nicholas1; Search for: Haywood, Misha; Search for: Martin, Nicolas F.1; Search for: Bergeron, Pierre; Search for: Beckmann, Volker; Search for: Bernard, Edouard; Search for: Bonifacio, Piercarlo; Search for: Caffau, Elisabetta; Search for: Carlberg, Raymond; Search for: Côté, Patrick1; Search for: Cabanac, Rémi; Search for: Chapman, Scott; Search for: Duc, Pierre-Alain; Search for: Durret, Florence; Search for: Famaey, Benoît; Search for: Fabbro, Sébastien1; Search for: Gwyn, Stephen1; Search for: Hammer, Francois; Search for: Hill, Vanessa; Search for: Hudson, Michael J.; Search for: Lançon, Ariane; Search for: Lewis, Geraint; Search for: Malhan, Khyati; Search for: Matteo, Paola Di; Search for: Mccracken, Henry; Search for: Mei, Simona; Search for: Mellier, Yannick; Search for: Navarro, Julio; Search for: Pires, Sandrine; Search for: Pritchet, Chris; Search for: Reylé, Celine; Search for: Richer, Harvey; Search for: Robin, Annie C.; Search for: Jannsen, Rubén Sánchez; Search for: Sawicki, Marcin; Search for: Scott, Douglas; Search for: Scottez, Vivien; Search for: Spekkens, Kristine; Search for: Starkenburg, Else; Search for: Thomas, Guillaume; Search for: Venn, Kim |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Format | Text, Article |
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| Subject | galaxies: formation; galaxy: halo; galaxy: stellar content; galaxy: structure; surveys |
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| Abstract | 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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| Publication date | 2017-10-20 |
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| Publisher | American Astronomical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 23002642 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 6ab53ee7-968f-4971-a0b8-599c6ad64c7a |
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| Record created | 2017-12-08 |
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| Record modified | 2020-05-30 |
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