2000/07/05 by Roman R. Rafikov · 6 citations
Physics and Astronomy · #Astrophysics #Astrophysics and Star Formation Studies #Classical mechanics #Dispersion relation #Gravitation #Gravitational instability #Instability #Kinematics #Mechanics #Optics #Physics #Pulsars and Gravitational Waves Research #Rotational symmetry #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2001.04201.x
published as Mon.Not.Roy.Astron.Soc. 323 (2001) 445-452 · 8 pages, 5 figures, 1 table, to be submitted to MNRAS
arxiv created 2000/07/05 · openalex publication_date 2001/05/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Purely gravitational perturbations are considered in a thin rotating disc composed of gas and several stellar components. The dispersion relation for the axisymmetric density waves propagating through the disc is found and the criterion for the local axisymmetric stability of the whole system is formulated. In the appropriate limit of two-component gas we confirm the findings of Jog & Solomon and extend consideration to the case when one component is collisionless. Gravitational stability of the Galactic disc in the solar neighbourhood based on the multicomponent instability condition is explored using recent measurements of the stellar composition and kinematics in the local Galactic disc obtained by the Hipparcos satellite.