Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441901b&link_type=abstract
American Astronomical Society, AAS Meeting #214, #419.01; Bulletin of the American Astronomical Society, Vol. 41, p.688
Astronomy and Astrophysics
Astronomy
Scientific paper
The potential-density phase-shift method is an effective new tool for investigating the structure and evolution of galaxies. In this poster, we apply the method to 153 galaxies in the Ohio State University Bright Galaxy Survey (OSUBGS) to study the general relationship between pattern corotation radii and the morphology of spiral galaxies. The analysis is based on near-infrared H-band images that have been deprojected and decomposed assuming a spherical bulge. We find that multiple pattern speeds are common in disk galaxies. By selecting those corotation radii close to or slightly larger than the bar radius as being the bar corotation (CR) radius, we find that the average and standard deviation of the ratio R = r(CR)/r(bar), is 1.20+/-0.52 for 101 galaxies having well-defined bars. There is an indication that this ratio depends weakly on galaxy type in the sense that it is larger for later type galaxies. Our bar corotation radii are on average smaller than those estimated from single pattern speed numerical simulations, most likely because these simulations tend to find the pattern speed which generates a density response in the gas that best matches the morphology of the outer spiral structure. Although we find CR radii in most of the sample galaxies that satisfy conventional ideas about the extent of bars, we also consider the alternative interpretation that in many cases the bar CR is actually inside the bar and that the bar ends close to its outer Lindblad resonance instead of its CR. These ``super-fast" bars are the most controversial finding from our study. This work was supported partly by NSF Grant AST05-07140.
Buta Ronald J.
Zhang Xinyu
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