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The Milky Way disc formation in the Gaia era – ARCHEOGAL

- Automated analysis of stellar spectra
- Distance and age estimation through isochrone fitting techniques.

- Bulge-disc relation and chemo-dynamical links.
- Disc kinematics in the early phases of formation.
- Thin-thick disc relation in the solar neighborhood.

- To continue the Gaia DR1 data analysis.
- To make a combined analysis of Gaia DR2 and GES DR5 data.
- To extend the solar neighborhood analysis to other galactic radii.

1. The Gaia-ESO Survey: low- a element stars in the Galactic bulge
Recio-Blanco, A., Rojas-Arriagada A., de Laverny P. et al. 2017, A&A Letters, sous presse, arXiv:1702.04500

2. The Gaia-ESO Survey: Exploring the complex nature and origins of the Galactic bulge
Rojas-Arriagada A., Recio-Blanco A. et al. 2016, A&A, sous presse

3. The Gaia-ESO Survey: Churning Through the Milky Way
Hayden M., Recio-Blanco, A., de Laverny P. et al. 2017, A&A, sous presse.

1. Chemical Cartography of the Milky Way Disk,
M. Hayden, oral presentation at the conference « The Milky
Way and its environment », Paris, Sept. 2016
2. Chemodynamical constraints on accreted stars with GES,
M. Hayden, oral presentation at the conference « The Milky
Way and its environment », Paris, Sept. 2016
3. Churning through the Milky Way Disk,
M. Hayden, oral presentation at the conference « The Gaia-ESO Survey third Science Meeting, Vilnius (Lituanie), Déc. 2015
4. Spectral analysis of FGK stars (WG10)
A. Recio-Blanco, oral presentation at the conference « The Gaia-ESO Survey third Science Meeting, Vilnius (Lituanie), Déc. 2015
5. Automated spectral analysis : lessons learn from GES and Gaia
A. Recio-Blanco, oral presentation at the European Week of Astronomy, Athènes (Grèce), Juillet 20162015
6. Low a-element stars in the Galactic Bulge
A. Recio-Blanco, oral presentation at the conference « Beyond the solar neighbourhood : entering in the Gaia era », Sesto (Italie), Janvier 2017.

Submission summary

How did our Galaxy form? What is its place, and ours, in the cosmic evolution? This ARCHEOGAL ANR project aims at unveiling the Milky Way disc formation process, taking advantage of the privileged position of the P.I in the European Gaia-ESO Survey (GES, a five years project using 300 nights of the ESO Very Large Telescope) and the ESA Gaia mission, whose time-lines overlap perfectly the present project time schedule.

Just as the history of life was deduced by examining rocks, Galactic Archaeology expects to unveil the history of the Milky Way by analysing stars. Thanks to the complementary scientific exploitation of GES and Gaia, ARCHEOGAL aims at building up an unprecedentedly extensive and homogeneous cosmic-time evolving chemo-dynamical picture of the Milky Way disc.

To this purpose, the project tasks, organised following the GES and Gaia data releases, will analyse the disc physical and chemical properties, linking them to the processes that led the Milky Way to form and evolve as a disc-type galaxy, in the more general context of galaxy evolution. In particular, the project work program is centred on:
1) The GES stellar spectra parameterisation and the scientific validation of the Gaia/RVS stellar parameters.
2) From GES and Gaia chemical element abundances, the analysis of the Galactic disc chemical substructures.
3) From GES spectro-photometric distances, followed by Gaia astrometric data, the study of the structural properties of chemically defined disc populations.
4) Thanks to GES+Gaia radial velocities and Gaia proper motions, the analysis of existent chemo-kinematical and chemo-dynamical correlations.
5) From combined Gaia+GES data, the estimation of precise stellar ages and the reconstruction of chemo-dynamical temporal gradients, to be compared with present scenarios of disc formation.

This ANR funding will be crucial to ensure the team's leading position in GES and also to strength the French contribution to the combined GES and Gaia science exploitation.

Project coordination


The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.



Help of the ANR 299,984 euros
Beginning and duration of the scientific project: September 2014 - 48 Months

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