Polygonal Structures in the Gaseous Disk: Numerical Simulations

Abstract

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 $<\alpha >\simeq 120^{\circ }$ for the average angles between straight segments.

22 pages, 10 figures

References in corpus (13)

• The structure of galactic disks: Studying late-type spiral galaxies using SDSS
• Spurs and feathering in spiral galaxies
• Model-based pattern speed estimates for 38 barred galaxies
• An HST Archival Survey of Feathers in Spiral Galaxies
• Cloud and Star Formation in Disk Galaxy Models with Feedback
• Instabilities of Spiral Shocks -- II. A quasi-steady State in the multi-phase inhomogeneous ISM
• The Potential-Density Phase Shift Method for Determining the Corotation Radii in Spiral and Barred Galaxies
• Pattern Corotation Radii from Potential-Density Phase-Shifts for 153 OSUBGS Sample Galaxies
• Galactic Spiral Shocks with Thermal Instability
• Numerical Modelling of the Vertical Structure and Dark Halo Parameters in Disc Galaxies
• Pattern speed of main spiral arms in NGC 2997: Estimate based on very young stellar complexes
• ASTE CO(3-2) Mapping toward the Whole Optical Disk of M 83: Properties of Inter-arm GMAs
• A Mechanism for the Oxygen and Iron Bimodal Radial Distribution Formation in the Disc of our Galaxy

Cited by in corpus (9)

• Hic sunt dracones: Cartography of the Milky Way spiral arms and bar resonances with Gaia Data Release 2
• Extreme kinematic misalignment in IllustrisTNG galaxies: the origin, structure and internal dynamics of galaxies with a large-scale counterrotation
• The simulation of molecular clouds formation in the Milky Way
• Global Gravitationally-Organized Spiral Waves and the Structure of NGC 5247
• ISM metallicity variations across spiral arms in disk galaxies: the impact of local enrichment and gas migration in the presence of radial metallicity gradient
• Modeling of Spiral Structure in a Multi-Component Milky~Way-Like Galaxy
• Global enhancement and structure formation of the magnetic field in spiral galaxies
• Straight segments in the galactic discs
• Galaxies with 'Rows': A New Catalog