Model-based pattern speed estimates for 38 barred galaxies
P. Rautiainen, H. Salo, E. Laurikainen

TL;DR
This study models 38 barred galaxies to estimate their pattern speeds using near-IR and optical data, revealing a dependence on galaxy type and correlations with bar size and strength.
Contribution
It introduces a method to determine pattern speeds from gravitational potential models based on photometry, highlighting the relation between bar dynamics and galaxy morphology.
Findings
Fast bars are common in early-type galaxies.
Slow bars tend to be shorter and weaker.
Pattern speed correlates with bar size and strength.
Abstract
We have modelled 38 barred galaxies by using near-IR and optical data from the Ohio State University Bright Spiral Galaxy Survey. We constructed the gravitational potentials of the galaxies from -band photometry, assuming constant mass-to-light ratio. The halo component we chose corresponds to the so called universal rotation curve. In each case, we used the response of gaseous and stellar particle disc to rigidly rotating potential to determine the pattern speed. We find that the pattern speed of the bar depends roughly on the morphological type. The average value of corotation resonance radius to bar radius, , increases from in types SB0/a -- SBab to in SBb and in SBbc -- SBc. Within the error estimates for the pattern speed and bar radius, all galaxies of type SBab or earlier have a fast bar (),…
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