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Chemical Mapping of the Milky Way with The Canada–France Imaging Survey: A Non-parametric Metallicity–Distance Decomposition of the Galaxy

Rodrigo Ibata 1 Alan Mcconnachie 2 Jean-Charles Cuillandre 3 Nicholas Fantin 2 Misha Haywood 4 Nicolas Martin 2 Pierre Bergeron 5 Volker Beckmann 6 Edouard Bernard 7 Piercarlo Bonifacio 4 Elisabetta Caffau 4 Raymond Carlberg Patrick Côté Remi Cabanac 8 Scott Scott Pierre-Alain Duc 9 Florence Durret 10 Benoît Famaey 1 Sébastien Fabbro Stephen Gwyn Francois Hammer 4 Vanessa Hill 7 Michael Hudson 11 Ariane Lançon 1 Geraint Lewis Khyati Malhan Paola Di Matteo 4 Henry Mccracken 10 Simona Mei 12 Yannick Mellier 10 Julio Navarro Sandrine Pires 9 Chris Pritchet Céline Reylé 13 Harvey Richer 1 Annie Robin 13 Rubén Sánchez Jannsen Marcin Sawicki Douglas Scott 14 Vivien Scottez 10 Kristine Spekkens Else Starkenburg Guillaume Thomas Kim Venn
Abstract : We present the chemical distribution of the Milky Way, based on 2900deg2ofu-band photometry taken as part ofthe Canada–France Imaging Survey. When complete, this survey will cover 10,000deg2of the northern sky. Bycombing the CFHTu-band photometry together with Sloan Digital Sky Survey and Pan-STARRSgr,,andi,wedemonstrate that we are able to reliably measure the metallicities of individual stars to∼0.2dex, and henceadditionally obtain good photometric distance estimates. This survey thus permits the measurement of metallicitiesand distances of the dominant main-sequence(MS)population out to approximately30 kpc, and provides a muchhigher number of stars at large extraplanar distances than have been available from previous surveys. We develop anon-parametric distance–metallicity decomposition algorithm and apply it to the sky atb3070∣∣< <and to theNorth Galactic Cap. Wefind 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 around3kpc. This may indicate that the inner halo was formed partly from disk stars ejected in an ancient minor merger.
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Submitted on : Monday, January 25, 2021 - 3:48:27 PM
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Rodrigo Ibata, Alan Mcconnachie, Jean-Charles Cuillandre, Nicholas Fantin, Misha Haywood, et al.. Chemical Mapping of the Milky Way with The Canada–France Imaging Survey: A Non-parametric Metallicity–Distance Decomposition of the Galaxy. The Astrophysical Journal, American Astronomical Society, 2017, 848 (2), pp.129. ⟨10.3847/1538-4357/aa8562⟩. ⟨hal-01714625⟩

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