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  Three mechanisms for bar thickening

Sellwood, J. A., & Gerhard, O. (2020). Three mechanisms for bar thickening. Monthly Notices of the Royal Astronomical Society, 495(3), 3175-3191. doi:10.1093/mnras/staa1336.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-F93B-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-950C-4
Genre: Journal Article

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Sellwood, J. A., Author
Gerhard, Ortwin1, Author              
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1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: We present simulations of bar-unstable stellar discs in which the bars thicken into box/peanut shapes. Detailed analysis of the evolution of each model revealed three different mechanisms for thickening the bars. The first mechanism is the well-known buckling instability, the second is the vertical excitation of bar orbits by passage through the 2:1 vertical resonance, and the third is a gradually increasing fraction of bar orbits trapped into this resonance. Since bars in many galaxies may have formed and thickened long ago, we have examined the models for fossil evidence in the velocity distribution of stars in the bar, finding a diagnostic to discriminate between a bar that had buckled from the other two mechanisms.

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 Dates: 2020-05-18
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa1336
Other: LOCALID: 3251710
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 495 (3) Sequence Number: - Start / End Page: 3175 - 3191 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150