Bars and Lenses in Spiral Galaxies: Clues for Secular Evolution
We analyze ~200 spiral galaxies in terms of elliptical isophotes, bar profile type, and non-axisymmetric perturbation amplitudes. More than half our sample is imaged in the H band, which enables us to derive gravitational potential and relative torque Q g . We find that bar axial ratios increase significantly with decreasing Hubble type, both for exponential and flat bars; however, at a given Hubble type, exponential bars tend to have a larger axial ratio than flat ones. We have also identified four different torque morphologies, and find that one of these is prevalent in strong bars. These results are interpreted in the context of a secular evolution scenario, in which we speculate that early-type flat bars are the descendants of late-type exponential ones.
KeywordsBars spiral galaxies near-infrared
Unable to display preview. Download preview PDF.
- Block, D.L., Bournaud, F., Combes, F., Puerari, I., and Buta, R. 2002, AandA, 394, L35Google Scholar
- Block, D.L., Puerari, I., Knapen,J.H., Elmegreen, B.G., Buta, R., Stedman, S., and Elmegreen, D.M. 2001, AandA, 375, 761Google Scholar
- Combes, F., and Elmegreen, B.G. 1993, AandA, 271, 391Google Scholar
- de Vaucouleurs, G., de Vaucouleurs, A., Corwin, H. G., Buta, R., Paturel, G., and Fouque, P. 1991, Third Reference Catalogue of Bright Galaxies (Springer, New York) (RC3)Google Scholar
- Hunt, L.K., Pierini, D., and Giovanardi, C. 2004, AandA, 414, 905Google Scholar
- Moriondo, G., et al. 1999, AandAS, 137, 101Google Scholar