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The radial extent of the Galactic thick disk

Published online by Cambridge University Press:  21 March 2017

Thomas Bensby
Thomas Bensby*
Affiliation:
Lund Observatory, Box 43, SE-221 00 Lund, Sweden
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Abstract

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Based on observational data from the fourth internal data release of the Gaia-ESO Survey we probe the abundance structure in the Milky Way stellar disk as a function of galactocentric radius and height above the plane. We find that the inner and outer Galactic disks have different chemical signatures. The stars in the inner Galactic disk show abundance signatures of both the thin and thick disks, while the stars in the outer Galactic disk resemble in majority the abundances seen in the thin disk. Assuming that the Galactic thick disk can be associated with the α-enriched population, this can be interpreted as that the thick disk density drops drastically beyond a galactocentric radius of about 10 kpc. This is in agreement with recent findings that the thick disk has a short scale-length, shorter than that of the the thin disk.

Keywords

Galaxy: diskGalaxy: evolutionGalaxy: structureGalaxy: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 3 - 5
Copyright
Copyright © International Astronomical Union 2017 

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