2004/12/01 by V. S. Beskin, В. С. Бескин, Alexander Tchekhovskoy +1 · 14 citations
Medicine · Physics and Astronomy · #Adaptive optics and wavefront sensing #Aerodynamics #Astrophysical Phenomena and Observations #Galaxies: Formation, Evolution, Phenomena #Internal medicine #Mechanics #Medicine #Observational study #Physics #Transonic #astro-ph
paper · pdf · doi:10.1051/0004-6361:20041592
published in Astronomy and Astrophysics 433(2), 619-628 (EDP Sciences) · Accepted to A&A; 11 pages, 7 figures, uses aa.cls
arxiv created 2004/12/01 · openalex publication_date 2005/03/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the two-dimensional structure of thin transonic accretion discs in the vicinity of black holes. We use the hydrodynamical version of the Grad-Shafranov equation and focus on the region inside the marginally stable orbit (MSO), . We show that all components of the dynamical force in the disc become significant near the sonic surface and especially important in the supersonic region. Under certain conditions, the disc structure is shown to be far from radial, and we review the affected disc properties, in particular the role of the critical condition at the sonic surface: it determines neither the accretion rate nor the angular momentum in the accretion disc. Finally, we present a simple model explaining quasi-periodical oscillations that have been observed in the infrared and X-ray radiation of the Galactic Centre.