Astrophysics and Space Science

, Volume 67, Issue 1, pp 147–171 | Cite as

Statistical characteristics of the dynamical structure in flat galaxies

  • M. Miyamoto
  • C. Satoh
  • M. Ohashi
Article

Abstract

Taking into account stellar velocity dispersion and galactic thickness in a self-consistent manner, we deduce dynamical properties for twenty-three flat galaxies from a rotation curve analysis using four adjustable parameters, which characterize the mass distribution in the spherical and the flattened parts of the galaxies. The present description of flat galaxies assumes an isotropic ‘stellar pressure’ as a simplest starting point, but the velocity distribution for a majority of the low-velocity stars still conforms to the classical stellar dynamics.

Our statistical analysis indicates thatQM α andEM β with α=1.9 and β=1.5, whereQ, E and ℳ are the total angular momentum, the total energy and the total mass of the galaxies, respectively. Among the structural parameters of the galaxies, an average dependence of the intrinsic flatness on the configuration energy defined by 4E/(G 2 M 5/Q 2) has also been inferred from the present models for the galaxies. The three statistical relationships we obtained indicate that the dynamical structure of the flat galaxies appear to be determined only by one parameter — the total mass. In the framework of the present description of flat galaxies, no distinct indication was found that the morphological types depend statistically on the dynamical parameters.

In accordance with these statistical results, a probable primeval state of galaxies is examined and an evolutionary course of galaxies is also discussed.

Keywords

Total Angular Momentum Differential Rotation Elliptical Galaxy Configuration Energy Residual Velocity 

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Copyright information

© D. Reidel Publishing Co. 1980

Authors and Affiliations

  • M. Miyamoto
    • 1
  • C. Satoh
    • 2
  • M. Ohashi
    • 1
  1. 1.Tokyo Astronomical ObservatoryUniversity of TokyoJapan
  2. 2.Dept of AstronomyUniversity of TokyoJapan

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