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Thomas Bensby. Profile photo.

Thomas Bensby

Senior lecturer

Thomas Bensby. Profile photo.

The radial extent of the Galactic thick disk

Author

  • Thomas Bensby

Summary, in English

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 10Â 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.

Department/s

  • Lund Observatory - Undergoing reorganization

Publishing year

2016-03-01

Language

English

Pages

3-5

Publication/Series

Proceedings of the International Astronomical Union

Volume

11

Issue

S321

Document type

Journal article

Publisher

Cambridge University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Galaxy: Abundances
  • Galaxy: disk
  • Galaxy: evolution
  • Galaxy: structure

Status

Published

ISBN/ISSN/Other

  • ISSN: 1743-9213