A-type stars in the Canada-France Imaging Survey - II. Tracing the height of 
the disc at large distances with Blue Stragglers

Thomas, Guillaume F.; Laporte, Chervin F. P.; McConnachie, Alan W.; Famaey, Benoit; Ibata, Rodrigo; Martin, Nicolas F.; Starkenburg, Else; Carlberg, Raymond; Malhan, Khyati; Venn, Kim

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A-type stars in the Canada-France Imaging Survey - II. Tracing the height of the disc at large distances with Blue Stragglers

MPS-Authors

Thomas, Guillaume F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Laporte, Chervin F. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

McConnachie, Alan W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Famaey, Benoit
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ibata, Rodrigo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martin, Nicolas F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Starkenburg, Else
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Carlberg, Raymond
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Malhan, Khyati
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Venn, Kim
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019MNRAS.483.3119T
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Citation

Thomas, G. F., Laporte, C. F. P., McConnachie, A. W., Famaey, B., Ibata, R., Martin, N. F., et al. (2019). A-type stars in the Canada-France Imaging Survey - II. Tracing the height of the disc at large distances with Blue Stragglers. Monthly Notices of the Royal Astronomical Society, 483, 3119-3126.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CFA6-7

Abstract

We present the kinematics of Blue Straggler (BS) stars identified in the Canada-France Imaging Survey (CFIS), covering 4000 deg² on the sky in the u band. The BSs sample, characterized through CFIS and Pan-STARRS photometry, has been kinematically decomposed into putative halo and disc populations after cross-matching with Gaia astrometry and SDSS/SEGUE/LAMOST spectroscopy. This decomposition clearly reveals the strong flaring of the outer Milky Way disc. In particular, we show that we can detect this flaring up to a vertical height of |Z| ≃ 8 kpc at a Galactocentric distance of R ̃27 kpc. While some small level of flaring is expected for extended discs built up by radial migration, we demonstrate that the very strong flaring of the Milky Way disc that we observe is likely more consistent with it being dynamically heated by the repeated passage of the Sagittarius dwarf spheroidal galaxy through the mid-plane.