NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T04:48:27 PDT
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For refcode 2007ApJ...670L..97E:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...670L..97E Variation of Galactic Bar Length with Amplitude and Density as Evidence for Bar Growth over a Hubble Time Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Knapen, Johan H.; Buta, Ronald J.; Block, David L.; Puerari, Ivanio Abstract. 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. Key words: Galaxies: Spiral, Galaxies: Structure
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