Angular momentum transfer in non-axisymmetric accretion
نویسندگان
چکیده
منابع مشابه
Enhanced Angular Momentum Transport in Accretion Disks
The status of our current understanding of angular momentum transport in accretion disks is reviewed. The last decade has seen a dramatic increase both in the recognition of key physical processes and in our ability to carry through direct numerical simulations of turbulent flow. Magnetic fields have at once powerful and subtle influences on the behavior of (sufficiently) ionized gas, rendering...
متن کاملAngular momentum transport in thin accretion disks and intermittent accretion.
The plasma modes, transporting angular momentum in accretion disks, under minimally restrictive conditions when the magnetic energy density is significant relative to the thermal energy density, are shown to be singular if the ideal MHD approximation is adopted. A similarity with the modes producing magnetic reconnection in current carrying plasmas is established. The combined effects of finite...
متن کاملAccretion of Low Angular Momentum Material onto Black Holes: Radiation Properties of Axisymmetric MHD Flows
Context: Numerical simulations of MHD accretion flows in the vicinity of a supermasssive black hole provide important insights to the problem of why and how systems – such as the Galactic Center – are underluminous and variable. In particular, the simulations indicate that low angular momentum accretion flow is strongly variable both quantitatively and qualitatively. This variability and a rela...
متن کاملAngular Momentum Transfer and Lack of Fragmentation in Self-gravitating Accretion Flows
Rapid inflows associated with early galaxy formation lead to the accumulation of self-gravitating gas in the central regions of proto-galaxies. Such gas accumulations are prone to non-axisymmetric instabilities, as in the well-known Maclaurin sequence of rotating ellipsoids, which are accompanied by a catastrophic loss of angular momentum. Self-gravitating gas is also intuitively associated wit...
متن کاملHysteresis effects and diagnostics of the shock formation in low angular momentum axisymmetric accretion in the Kerr metric
The secular evolution of the purely general relativistic low angular momentum accretion flow around a spinning black hole is shown to exhibit hysteresis effects. This confirms that a stationary shock is an integral part of such an accretion disc in the Kerr metric. The equations describing the space gradient of the dynamical flow velocity of the accreting matter have been shown to be equivalent...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1988
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/232.1.91