One-dimensional periodic flows with a shock transition - Application to the density wave theory of spiral structure

Abstract

view Abstract Citations (2) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS One-dimensional periodic flows with a shock transition - Application to the density wave theory of spiral structure Bogdan, T. J. Abstract The problem of one-dimensional gas flow through a sinusoidal gravitational potential with a series of equally spaced shock fronts is considered. For time-independent and spatially periodic flows, an integral equation relates the flow velocity to the gravitational potential and source functions of energy and momentum densities. It is suggested that this problem simulates some of the dynamical effects of the azimuthal flow on a parcel of gas at a fixed radius in a galactic disk that supports a spiral density wave structure. It omits the radial motions. In this context, a typical azimuthal velocity across a spiral arm is specified and the resultant source functions are obtained. The implications of this calculation suggest heating of the gaseous disk by O and B stars behind the shock front, and subsequent interarm cooling is a plausible mechanism for maintaining the periodic cycling of the gaseous component of the galactic disk. Publication: The Astrophysical Journal Pub Date: April 1983 DOI: 10.1086/160848 Bibcode: 1983ApJ...267..109B Keywords: Density Wave Model; Galactic Structure; Hydrodynamics; One Dimensional Flow; Shock Fronts; Spiral Galaxies; Transition Flow; Astronomical Models; Disk Galaxies; Flow Velocity; Gas Flow; Gas Heating; Gravitational Fields; Sine Waves; Astrophysics full text sources ADS |