Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-11
Mon.Not.Roy.Astron.Soc. 337 (2002) 1118
Astronomy and Astrophysics
Astrophysics
37 pages with 12 figures (text in TEX-format and figures in ps and eps). Accepted to MNRAS
Scientific paper
10.1046/j.1365-8711.2002.06008.x
Non-axisymmetric forces are presented for 107 spiral galaxies using the 2 Micron All Sky Survey (2MASS) images. We apply both Cartesian integration and a polar grid integration utilizing a limited number of azimuthal Fourier components of density. We found that bar strength is independent of the method used to evaluate the gravitational potential. However, the polar method is more suitable for weak and noisy images. Bar strength was found to be sensitive to the Hubble-type dependent scale height of the disk, which has been ignored in the previous studies. On the other hand, the method is rather insensitive to the vertical model of the disk, as long as a same vertical dispersion is assumed, or to the boxy/peanut shaped structure, studied in terms of non-constant vertical scale height along the disk. In the near-IR most galaxies in our sample show non-axisymmetric forces in some level, and 40 percent of them have bars in a sense that they have regions with a constant phase of the m=2 Fourier density component.
Laurikainen Eija
Salo Heikki
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