2010/06/30 by S. A. Khoperskov, A. V. Khoperskov, M. A. Eremin +1 · 13 citations
Physics and Astronomy · #Amplitude #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Computer simulation #Density wave theory #Galaxies: Formation, Evolution, Phenomena #Galaxy #Rotation (mathematics) #Row #Spiral (railway) #Spiral galaxy #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1134/s032001081108002x
published in Astronomy Letters 37(8), 563-575 (Pleiades Publishing) · 22 pages, 10 figures
openalex publication_date 2011/08/01 · arxiv created 2011/09/03 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The results of numerical simulations of a gaseous disk in the potential of a stellar spiral density wave are presented. The conditions under which straightened spiral arm segments (rows) form in the gas component are studied. These features of the spiral structure were identified in a series of works by A.D. Chernin with coauthors. Gas-dynamic simulations have been performed for a wide range of model parameters: the pitch angle of the spiral pattern, the amplitude of the stellar spiral density wave, the disk rotation speed, and the temperature of the gas component. The results of 2D- and 3D-disk simulations are compared. The rows in the numerical simulations are shown to be an essentially nonstationary phenomenon. A statistical analysis of the distribution of geometric parameters for spiral patterns with rows in the observed galaxies and the constructed hydrodynamic models shows good agreement. In particular, the numerical simulations and observations of galaxies give 〈α〉 ~ 120° for the average angles between straight segments.