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Creation of Peanut-Shaped Bulges via the Slow Mode of Bar Growth

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arxiv 1310.7920 v1 pith:BR3JQZCM submitted 2013-10-29 astro-ph.GA

Creation of Peanut-Shaped Bulges via the Slow Mode of Bar Growth

classification astro-ph.GA
keywords diskgrowthmodepeanut-shapedbulgescreationfastorbit
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Recent theoretical work has implicated fast bar formation modes and subsequent evolution as the creation mechanism for the observed peanut-shaped bulges in some edge-on disk galaxies. We demonstrate an N-body simulation of a disk undergoing a contrasting slow mode of bar growth, unsubjected to a buckling instability, which nonetheless grows the 4:1 orbit family responsible for a peanut-shaped bulge. We also present a simulation with fast mode bar growth, which exhibits thickening similar to other work. A novel orbit classification method that finds dynamically distinct families is presented, allowing for a detailed analysis of angular momentum transfer channels within the disk.

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