Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

The radial extent of the Galactic thick disk

Bensby, Thomas LU orcid (2016) In Proceedings of the International Astronomical Union 11(S321). p.3-5
Abstract

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... (More)

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.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Galaxy: Abundances, Galaxy: disk, Galaxy: evolution, Galaxy: structure
in
Proceedings of the International Astronomical Union
volume
11
issue
S321
pages
3 pages
publisher
Cambridge University Press
external identifiers
  • scopus:85047006747
ISSN
1743-9213
DOI
10.1017/S1743921316008875
language
English
LU publication?
yes
id
c1d3b086-4057-4841-bacf-793fef9cb7ec
date added to LUP
2018-05-30 15:54:29
date last changed
2024-01-14 21:04:12
@article{c1d3b086-4057-4841-bacf-793fef9cb7ec,
  abstract     = {{<p>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.</p>}},
  author       = {{Bensby, Thomas}},
  issn         = {{1743-9213}},
  keywords     = {{Galaxy: Abundances; Galaxy: disk; Galaxy: evolution; Galaxy: structure}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{S321}},
  pages        = {{3--5}},
  publisher    = {{Cambridge University Press}},
  series       = {{Proceedings of the International Astronomical Union}},
  title        = {{The radial extent of the Galactic thick disk}},
  url          = {{http://dx.doi.org/10.1017/S1743921316008875}},
  doi          = {{10.1017/S1743921316008875}},
  volume       = {{11}},
  year         = {{2016}},
}