Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time
Ks-band images of 20 barred galaxies show an increase in the peak amplitude of the normalized m=2 Fourier component with the R25-normalized radius at this peak. This implies that longer bars have higher m=2 amplitudes. The long bars also correlate with an increased density in the central parts of the disks, as measured by the luminosity inside 0
Elmegreen, Bruce G. et al.
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2007