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Article Dans Une Revue The Astrophysical Journal Année : 2017

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

Rodrigo Ibata
Nicolas Martin
Raymond Carlberg
Patrick Côté
  • Fonction : Auteur
Scott Scott
  • Fonction : Auteur
Benoît Famaey
Sébastien Fabbro
Stephen Gwyn
Vanessa Hill
Michael J. Hudson
  • Fonction : Auteur
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Ariane Lançon
Geraint Lewis
  • Fonction : Auteur
Khyati Malhan
Julio Navarro
  • Fonction : Auteur
Sandrine Pires
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  • PersonId : 980620
Chris Pritchet
  • Fonction : Auteur
Rubén Sánchez Jannsen
  • Fonction : Auteur
Marcin Sawicki
Douglas Scott
Kristine Spekkens
  • Fonction : Auteur
Else Starkenburg
  • Fonction : Auteur
Guillaume Thomas
Kim Venn

Résumé

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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Dates et versions

hal-01714625 , version 1 (25-01-2021)

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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, 2017, 848 (2), pp.129. ⟨10.3847/1538-4357/aa8562⟩. ⟨hal-01714625⟩
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