Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time

Details Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time

2007-11-20

arxiv.org/abs/0711.3055v1

Astronomy and Astrophysics

Astrophysics

ApJ Letters, 670, L97, preprint is 7 pages, 4 figures

Scientific paper

10.1086/524359

K_s-band images of 20 barred galaxies show an increase in the peak amplitude of the normalized m=2 Fourier component with the R_25-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 0.25R_25 divided by the cube of this radius in kpc. Because denser galaxies evolve faster, these correlations suggest that bars grow in length and amplitude over a Hubble time with the fastest evolution occurring in the densest galaxies. All but three of the sample have early-type flat bars; there is no clear correlation between the correlated quantities and the Hubble type.

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