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The 3D Structure of the Galactic Bulge
Zoccali, Manuela; Valenti, Elena
AA(Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile; Millennium Institute of Astrophysics, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile), AB(European Southern Observatory, Karl-Schwarzschild Strasse 2, D-85748 Garching, Germany)
Publications of the Astronomical Society of Australia, Volume 33, id.e025 10 pp. (PASA Homepage)
Publication Date:
Astronomy Keywords:
galaxy: bulge, galaxy: structure, galaxy: stellar content
Abstract Copyright:
2016: Astronomical Society of Australia
Bibliographic Code:


We review the observational evidences concerning the three-dimensional structure of the Galactic bulge. Although the inner few kpc of our Galaxy are normally referred to as the bulge, all the observations demonstrate that this region is dominated by a bar, i.e., the bulge is a bar. The bar has a boxy/peanut (X-shaped) structure in its outer regions, while it seems to become less and less elongated in its innermost region. A thinner and longer structure departing from the main bar has also been found, although the observational evidences that support the scenario of two separate structures has been recently challenged. Metal-poor stars ([Fe/H] ≲ -0.5 dex) trace a different structure, and also have different kinematics.
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