Abstract
view Abstract Citations (174) References (41) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Modal Approach to the Morphology of Spiral Galaxies. II. Dynamical Mechanisms Bertin, G. ; Lin, C. C. ; Lowe, S. A. ; Thurstans, R. P. Abstract A unified approach to spiral modes is carried out through the use of a cubic dispersion relationship developed earlier. This allows us to demonstrate the processes of maintenance and excitation of spiral modes of various morphologies separately for (a) normal spiral modes and (b) open spiral modes. In order to understand the relevant physical mechanisms and the general roles of the dynamical parameters (specified by the radial distribution of angular velocity, active surface density, and equivalent dispersive speed) the waves are described in terms of sustained wave trains. This allows us to examine the various dynamical issues discussed in Paper I. Very good accuracy is found when the present analytical results are compared with exact numerical data. The analytical approach makes it much easier to accomplish the process of identification of basic states from the observed spiral structure when a wide range of variation of the parameters of the basic state is involved. Our characterization of parameter regimes in terms of a few simple algebraic relations will be a useful guide for the construction of detailed quantitative models of specific galaxies and for general numerical surveys of classes of galaxies of given morphological types. Publication: The Astrophysical Journal Pub Date: March 1989 DOI: 10.1086/167183 Bibcode: 1989ApJ...338..104B Keywords: GALAXIES: INTERNAL MOTIONS; GALAXIES: STRUCTURE; STARS: STELLAR DYNAMICS full text sources ADS | Related Materials (2) Part 1: 1989ApJ...338...78B Part 3: 1994ApJ...427..184L
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
