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Bars and Boxy/Peanut-Shaped Bulges: An Observational Point of View | M. Bureau
; K. C. Freeman
; E. Athanassoula
; | Date: |
19 Dec 1998 | Subject: | astro-ph | Abstract: | Prompted by work on the buckling instability in barred spiral galaxies, much effort has been devoted lately to the study of boxy/peanut-shaped (B/PS) bulges. Here, we present new bar diagnostics for edge-on spiral galaxies based on periodic orbits calculations and hydrodynamical simulations. Both approaches provide reliable ways to identify bars and their orientations in edge-on systems. We also present the results of an observational search for bars in a large sample of edge-on spirals with and without B/PS bulges. We show that most B/PS bulges are due to the presence of a thick bar viewed edge-on while only a few may be due to accretion. This strongly supports the bar-buckling mechanism for the formation of B/PS bulges. | Source: | arXiv, astro-ph/9901246 | Services: | Forum | Review | PDF | Favorites |
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