Spiral-Vortex Structure in the Gaseous Disks of Galaxies |
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| Authors: | AM Fridman OV Khoruzhii VV Lyakhovich VS Avedisova OK Sil'chenko AV Zasov AS Rastorguev VL Afanas'iev SN Dodonov J Boulesteix |
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| Institution: | (1) Institute of Astronomy of the Russian Academy of Science, 48, Pyatnitskaya St., Moscow, 109017, Russia;(2) Sternberg Astronomical Institute, Moscow State University, University prospect, 13, Moscow, 119899, Russia;(3) Special Astrophysical Observatory of the Russian Academy of Sciences, Zelenchukskaya, 377140, Russia;(4) Observatoire de Marseille, Place le Verrier, F-13248 Marseille, Cedex 04, France |
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| Abstract: | General ideas, as well as experimental and theoretical efforts concerning the prediction and discovery of new structures in the disks of spiral galaxies – giant anticyclones - are reviewed. A crucial point is the development of a new method to restore the full vector velocity field of the galactic gas from the line-of-sight velocity field. This method can be used to get self-consistent solutions for the following problems: 1) determination of non-circular velocities associated with spiral-vortex structure; 2) determination of fundamental parameters of this structure: pattern speed, corotation radius, location of giant anticyclones; 3) refinement of galactic rotation curves taking into account regular non-circular motion in the spiral density wave, which makes it possible to build more accurate models of the mass distribution in the galaxy; 4) refinement of parameters of the rotating gaseous disk: inclination angle, center of rotation and position angle of the major dynamical axis, systematic velocity. The method is demonstrated using the restoration of the velocity field of the galaxy NGC 157 as an example. Results for this and some other spiral galaxies suggest that giant anticyclones are a universal property of galaxies with grand design structure. |
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