Boxy/Peanut/X Bulges, Barlenses and the Thick Part of Galactic Bars: What Are They and How Did They Form?

E. Athanassoula (1)

1 LAM - Laboratoire d'Astrophysique de Marseille

Bars have a complex three-dimensional shape. In particular their inner part is vertically much thicker than the parts further out. Viewed edge-on, the thick part of the bar is what is commonly known as a boxy-, peanut-, or X- bulge and viewed face-on it is referred to as a barlens. These components are due to disc and bar instabilities and are composed of disc material. I review here their formation, evolution and dynamics, using simulations, orbital structure theory and comparisons to observations.

Mots clés: Physics; Astrophysics - Astrophysics of Galaxies

Domaines: Planète et Univers [physics]

E. Athanassoula. Boxy/Peanut/X Bulges, Barlenses and the Thick Part of Galactic Bars: What Are They and How Did They Form?. Galactic Bulges, Astrophysics and Space Science Library, 2016, à renseigner, Unknown Region. pp.391, ⟨10.1007/978-3-319-19378-6_14⟩. ⟨insu-03690640⟩