Growth of a peanut shaped bulge via resonant trapping of stellar orbits in the vertical Inner Lindblad Resonances

Details Growth of a peanut shaped bulge via resonant trapping of stellar orbits in the vertical Inner Lindblad Resonances Growth of a peanut shaped bulge via resonant trapping of stellar orbits in the vertical Inner Lindblad Resonances

2002-03-11

arxiv.org/abs/astro-ph/0203170v3

Astronomy and Astrophysics

Astrophysics

Accepted for publication in AJ

Scientific paper

10.1086/341753

We present a simple resonant Hamiltonian model for the vertical response of a stellar disk to the growth of a bar perturbation. As a bar perturbation grows stars become trapped in vertical Inner Lindblad resonances and are lifted into higher amplitude orbits. The vertical structure of a boxy and peanut shaped bulge as a function of radius and azimuthal angle in the galaxy plane can be predicted from the strength and speed of the bar perturbation and the derivatives of the gravitational potential. This model predicts that stars on the outer side of the resonance are lifted higher than stars on the inner side, offering an explanation for the sharp outer edge of the boxy/peanut.

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